ZSI_Reconnect_China/PATSTAT/CPC_data/CPCSchemeXML202302/cpc-scheme-H04B.xml

<?xml version="1.0" encoding="UTF-8"?>
<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="H04B" definition-exists="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>TRANSMISSION</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph>This subclass <u>covers</u> the transmission of information-carrying signals, the transmission being independent of the nature of the information, and includes monitoring and testing arrangements and the suppression and limitation of noise and interference.</note-paragraph></note><note type="warning"><note-paragraph>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="H04B1/00" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/00</classification-symbol>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B1/00" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/00</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Details of transmission systems, not covered by a single one of groups <class-ref scheme="cpc">H04B3/00</class-ref> - <class-ref scheme="cpc">H04B13/00</class-ref></text></title-part><title-part><text>Details of transmission systems not characterised by the medium used for transmission</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> In this group, group <class-ref scheme="cpc">H04B1/0003</class-ref> takes precedence over groups <class-ref scheme="cpc">H04B1/005</class-ref>&#160;-&#160;<class-ref scheme="cpc">H04B1/76</class-ref></note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/0003" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H04B1/0003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain </text><reference><text>digital baseband systems <class-ref scheme="cpc">H04L25/00</class-ref>; digital modulation/demodulation <class-ref scheme="cpc">H04L27/00</class-ref>; CDMA <class-ref scheme="cpc">H04B1/707</class-ref>; TDMA <class-ref scheme="cpc">H04B7/2643</class-ref>; image transmission <class-ref scheme="cpc">H04N5/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/0007" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/001" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Channel filtering, i.e. selecting a frequency channel within the SDR system </text><reference><text>multiplexing of multicarrier modulation signals being represented by different frequencies <class-ref scheme="cpc">H04L5/06</class-ref>; multiplexing of multicarrier modulation signals <class-ref scheme="cpc">H04L5/023</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0014" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0014</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using DSP [Digital Signal Processor] quadrature modulation and demodulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0017" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0017</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Digital filtering </text><reference><text><class-ref scheme="cpc">H04B1/001</class-ref> takes precedence; digital filters <u>per se</u> <class-ref scheme="cpc">H03H17/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0021" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Decimation, i.e. data rate reduction techniques </text><reference><text><class-ref scheme="cpc">H04B1/0025</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0025" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a sampling rate lower than twice the highest frequency component of the sampled signal </text><reference><text>for demodulation of angle-modulated signals <class-ref scheme="cpc">H03D3/006</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/0028" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>wherein the AD/DA conversion occurs at baseband stage</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0032" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0032</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with analogue quadrature frequency conversion to and from the baseband </text><reference><text>quadrature modulators and demodulators <u>per se</u> <class-ref scheme="cpc">H03D3/007</class-ref>, <class-ref scheme="cpc">H03C3/40</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0035" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0035</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Channel filtering, i.e. selecting a frequency channel within a software radio system </text><reference><text>multiplexing of multicarrier modulation signals being represented by different frequencies <class-ref scheme="cpc">H04L5/06</class-ref>; multiplexing of multicarrier modulation signals <class-ref scheme="cpc">H04L5/023</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0039" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0039</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using DSP [Digital Signal Processor] quadrature modulation and demodulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0042" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Digital filtering </text><reference><text><class-ref scheme="cpc">H04B1/0035</class-ref> takes precedence; digital filters <u>per se</u> <class-ref scheme="cpc">H03H17/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0046" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Decimation, i.e. data rate reduction techniques</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/005" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/0053" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0053</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with common antenna for more than one band</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0057" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using diplexing or multiplexing filters for selecting the desired band</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/006" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-09-01" status="published"><classification-symbol>H04B1/006</classification-symbol><class-title date-revised="2015-09-01"><title-part><CPC-specific-text><text>using switches for selecting the desired band </text><reference><text><class-ref scheme="cpc">H04B1/0057</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/0064" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0064</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with separate antennas for the more than one band </text><reference><text><class-ref scheme="cpc">H04B1/0053</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/0067" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0067</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with one or more circuit blocks in common for different bands</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0071" definition-exists="true" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0071</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a common intermediate frequency for more than one band </text><reference><text><class-ref scheme="cpc">H04B1/0075</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0075" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0075</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using different intermediate frequencied for the different bands</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/0078" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0078</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a common intermediate frequency amplifier for the different intermediate frequencies, e.g. when using switched intermediate frequency filters</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0082" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a common local oscillator for more than one band</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/0085" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>where one band is the image frequency band of the other and the band selection is done by image rejection</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/0089" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0089</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a first intermediate frequency higher that the highest of any band received</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/0092" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0092</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a wideband front end</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/0096" definition-exists="false" ipc-concordant="H04B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0096</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>where a full band is frequency converted into another full band</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/02" definition-exists="true" ipc-concordant="H04B1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/02</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Transmitters</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/03" definition-exists="true" ipc-concordant="H04B1/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/03</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Constructional details, e.g. casings, housings</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/034" definition-exists="true" ipc-concordant="H04B1/034" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/034</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Portable transmitters</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/0343" definition-exists="false" ipc-concordant="H04B1/034" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0343</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>to be carried on the body</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/0346" definition-exists="false" ipc-concordant="H04B1/034" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0346</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hand-held transmitters</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/036" definition-exists="true" ipc-concordant="H04B1/036" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/036</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Cooling arrangements</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/04" definition-exists="true" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/04</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Circuits</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B1/0408" definition-exists="false" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/0408</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with power amplifiers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/0416" definition-exists="false" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/0416</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having gain or transmission power control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/0425" definition-exists="false" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/0425</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with linearisation using predistortion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/0433" definition-exists="false" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/0433</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with linearisation using feedback</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/0441" definition-exists="false" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/0441</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with linearisation using feed-forward</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/045" definition-exists="false" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with means for improving efficiency</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0458" definition-exists="true" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0458</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages </text><reference><text>matching circuits in general <class-ref scheme="cpc">H03H</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0466" definition-exists="true" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0466</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fault detection or indication </text><reference><text><class-ref scheme="cpc">H04B1/0483</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0475" definition-exists="true" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0475</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with means for limiting noise, interference or distortion </text><reference><text><class-ref scheme="cpc">H04B1/0483</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/0483" definition-exists="false" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/0483</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transmitters with multiple parallel paths</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B1/0491" definition-exists="false" ipc-concordant="H04B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/0491</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with frequency synthesizers, frequency converters or modulators</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/06" definition-exists="true" ipc-concordant="H04B1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/06</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Receivers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/08" definition-exists="false" ipc-concordant="H04B1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Constructional details, e.g. cabinet</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/082" definition-exists="true" ipc-concordant="H04B1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>to be used in vehicles </text><reference><text><class-ref scheme="cpc">H04B1/086</class-ref> takes precedence; holding or mounting accessories <class-ref scheme="cpc">B60R11/02</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/084" definition-exists="false" ipc-concordant="H04B1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/084</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with removable front panel</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/086" definition-exists="false" ipc-concordant="H04B1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Portable receivers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/088" definition-exists="false" ipc-concordant="H04B1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/088</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with parts of the receiver detachable or collapsible</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/10" definition-exists="true" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/10</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Means associated with receiver for limiting or suppressing noise or interference</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/1009" definition-exists="true" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1009</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Placing the antenna at a place where the noise level is low and using a noise-free transmission line between the antenna and the receivers </text><reference><text>screened aerials <class-ref scheme="cpc">H01Q7/04</class-ref>; feeders for aerials <class-ref scheme="cpc">H01Q9/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/1018" definition-exists="true" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1018</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>noise filters connected between the power supply and the receiver </text><reference><text>suppression or limitation of noise from electric apparatus <class-ref scheme="cpc">H04B15/00</class-ref>; demodulation <class-ref scheme="cpc">H03D</class-ref>; ripple filters <class-ref scheme="cpc">H02M1/14</class-ref>; filters in general <class-ref scheme="not-mapped">95G</class-ref>, <class-ref scheme="cpc">H03H</class-ref>; power supplies <class-ref scheme="cpc">H04B1/1607</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/1027" definition-exists="false" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>assessing signal quality or detecting noise/interference for the received signal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/1036" definition-exists="true" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1036</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters </text><reference><text><class-ref scheme="cpc">H04B1/123</class-ref> takes precedence; filter circuits <class-ref scheme="cpc">H03H</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/1045" definition-exists="false" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/1045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Adjacent-channel interference</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/1054" definition-exists="false" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/1054</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by changing bandwidth</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/1063" definition-exists="false" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/1063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a notch filter</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/1072" definition-exists="false" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/1072</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by tuning the receiver frequency</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/1081" definition-exists="true" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reduction of multipath noise </text><reference><text>by equalising <class-ref scheme="cpc">H04B7/005</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/109" definition-exists="true" ipc-concordant="H04B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/109</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/12" definition-exists="true" ipc-concordant="H04B1/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/12</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Neutralising, balancing, or compensation arrangements</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/123" definition-exists="true" ipc-concordant="H04B1/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/123</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using adaptive balancing or compensation means </text><reference><text>adaptive filter circuits and algorithms <class-ref scheme="cpc">H03H</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/126" definition-exists="true" ipc-concordant="H04B1/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/126</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having multiple inputs, e.g. auxiliary antenna for receiving interfering signal </text><reference><text>aerials in general <class-ref scheme="cpc">H01Q</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/14" definition-exists="false" ipc-concordant="H04B1/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Automatic detuning arrangements</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/16" definition-exists="true" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/16</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Circuits</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/1607" definition-exists="true" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-07-01" status="published"><classification-symbol>H04B1/1607</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Supply circuits </text><reference><text>converters <class-ref scheme="cpc">H02M</class-ref>; filters therefor <class-ref scheme="cpc">H02M1/14</class-ref>; voltage stabilisers <class-ref scheme="cpc">G05F1/46</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/1615" definition-exists="true" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-09-03" status="published"><classification-symbol>H04B1/1615</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Switching on; Switching off, e.g. remotely </text><reference><text>battery saving circuits associated with selective call operation <class-ref scheme="cpc">H04W52/00</class-ref>; details of power consumption reduction in a PLL, <class-ref scheme="cpc">H03L7/0802</class-ref>, <class-ref scheme="cpc">H03L7/14</class-ref>, <class-ref scheme="cpc">H03L2207/08</class-ref>, <class-ref scheme="cpc">H03L2207/18</class-ref>; muting amplifiers by gain control <u>see</u> <class-ref scheme="cpc">H03G3/34</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/1623" definition-exists="false" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1623</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using tubes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/163" definition-exists="true" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/163</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Special arrangements for the reduction of the damping of resonant circuits of receivers </text><reference><text>amplifiers <class-ref scheme="cpc">H03F</class-ref>; negative impedance networks for line transmission systems <class-ref scheme="cpc">H04B3/16</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/1638" definition-exists="true" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1638</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Special circuits to enhance selectivity of receivers not otherwise provided for </text><reference><text>resonant circuits <class-ref scheme="cpc">H03H</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/1646" definition-exists="true" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1646</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>adapted for the reception of stereophonic signals</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/1653" definition-exists="false" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1653</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Detection of the presence of stereo signals and pilot signal regeneration</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/1661" definition-exists="false" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1661</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reduction of noise by manipulation of the baseband composite stereophonic signal or the decoded left and right channels</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/1669" definition-exists="false" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1669</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of the demodulated composite stereo signal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/1676" definition-exists="false" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1676</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of the sum or difference signal</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/1684" definition-exists="false" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1684</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of the decoded left or right stereo channel</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/1692" definition-exists="true" ipc-concordant="H04B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/1692</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using companding of the stereo difference signal, e.g. FMX </text><reference><text>volume compression or expansion in amplifiers <class-ref scheme="cpc">H03G7/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/18" definition-exists="false" ipc-concordant="H04B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>H04B1/18</classification-symbol><class-title date-revised="2018-01-01"><title-part><text>Input circuits, e.g. for coupling to an antenna or a transmission line </text><reference><text>coupling networks between antennas or lines and receivers independent of the nature of the receiver <class-ref scheme="cpc">H03H</class-ref></text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/20" definition-exists="true" ipc-concordant="H04B1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/20</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>for coupling gramophone pick-up, recorder output, or microphone to receiver</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/202" definition-exists="true" ipc-concordant="H04B1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/202</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by remote control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/205" definition-exists="false" ipc-concordant="H04B1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with control bus for exchanging commands between units</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/207" definition-exists="true" ipc-concordant="H04B1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/207</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with an audio or audio/video bus for signal distribution </text><reference><text><class-ref scheme="cpc">H04B1/205</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/22" definition-exists="false" ipc-concordant="H04B1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for receivers in which no local oscillation is generated</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/24" definition-exists="true" ipc-concordant="H04B1/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the receiver comprising at least one semiconductor device having three or more electrodes</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/26" definition-exists="false" ipc-concordant="H04B1/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for superheterodyne receivers </text><reference><text>multiple frequency-changing <class-ref scheme="cpc">H03D7/16</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/28" definition-exists="true" ipc-concordant="H04B1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the receiver comprising at least one semiconductor device having three or more electrodes</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/30" definition-exists="true" ipc-concordant="H04B1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for homodyne or synchrodyne receivers </text><reference><text>demodulator circuits <class-ref scheme="cpc">H03D1/22</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/302" definition-exists="true" ipc-concordant="H04B1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/302</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for single sideband receivers </text><reference><text>demodulator circuits <class-ref scheme="cpc">H03D1/24</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/305" definition-exists="false" ipc-concordant="H04B1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/305</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using dc offset compensation techniques</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/307" definition-exists="false" ipc-concordant="H04B1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/307</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using n-port mixer</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/38" definition-exists="true" ipc-concordant="H04B1/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/3805" definition-exists="false" ipc-concordant="H04B1/3805" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/3805</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with built-in auxiliary receivers</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B1/3811" definition-exists="false" ipc-concordant="H04B1/3805" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/3811</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Split configuration of transmission devices</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/3816" definition-exists="true" ipc-concordant="H04B1/3816" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/3816</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Mechanical arrangements for accommodating identification devices, e.g. cards or chips</text></title-part><title-part><text>with connectors for programming identification devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/3818" definition-exists="false" ipc-concordant="H04B1/3818" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-05-01" status="published"><classification-symbol>H04B1/3818</classification-symbol><class-title><title-part><text>Arrangements for facilitating insertion or removal of identification devices</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/3822" definition-exists="true" ipc-concordant="H04B1/3822" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/3822</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>specially adapted for use in vehicles </text><reference><text><class-ref scheme="cpc">H04B1/3827</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/3827" definition-exists="false" ipc-concordant="H04B1/3827" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/3827</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Portable transceivers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/3833" definition-exists="false" ipc-concordant="H04B1/3827" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/3833</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hand-held transceivers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/3838" definition-exists="true" ipc-concordant="H04B1/3827" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/3838</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="12" additional-only="true" sort-key="H04B1/3844" definition-exists="false" ipc-concordant="H04B1/3827" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B2001/3844</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with means to alert the user that a certain exposure has been reached</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/385" definition-exists="false" ipc-concordant="H04B1/3827" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/385</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transceivers carried on the body, e.g. in helmets</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/3855" definition-exists="false" ipc-concordant="H04B1/3827" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B2001/3855</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>carried in a belt or harness</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/3861" definition-exists="false" ipc-concordant="H04B1/3827" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B2001/3861</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>carried in a hand or on fingers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/3866" definition-exists="false" ipc-concordant="H04B1/3827" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B2001/3866</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>carried on the head</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/3872" definition-exists="false" ipc-concordant="H04B1/3827" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B2001/3872</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with extendable microphones or earphones</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/3877" definition-exists="true" ipc-concordant="H04B1/3877" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/3877</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/3883" definition-exists="true" ipc-concordant="H04B1/3883" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/3883</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for mounting batteries or battery chargers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/3888" definition-exists="false" ipc-concordant="H04B1/3888" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/3888</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for carrying or protecting transceivers</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B1/3894" definition-exists="false" ipc-concordant="H04B1/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/3894</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Waterproofing of transmission device</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/40" definition-exists="false" ipc-concordant="H04B1/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Circuits</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/401" definition-exists="true" ipc-concordant="H04B1/401" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/401</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for selecting or indicating operating mode</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/403" definition-exists="false" ipc-concordant="H04B1/403" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/403</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/405" definition-exists="false" ipc-concordant="H04B1/405" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/405</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with multiple discrete channels</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/406" definition-exists="true" ipc-concordant="H04B1/403" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/406</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with more than one transmission mode, e.g. analog and digital modes</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/408" definition-exists="false" ipc-concordant="H04B1/408" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/408</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the transmitter oscillator frequency being identical to the receiver local oscillator frequency</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/44" definition-exists="true" ipc-concordant="H04B1/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/44</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transmit/receive switching</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/46" definition-exists="true" ipc-concordant="H04B1/46" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/46</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by voice-frequency signals</text></title-part><title-part><text>by pilot signals</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/48" definition-exists="true" ipc-concordant="H04B1/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/48</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H04B1/46</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="12" additional-only="true" sort-key="H04B1/485" definition-exists="false" ipc-concordant="H04B1/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/485</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>inhibiting unwanted transmission</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/50" definition-exists="false" ipc-concordant="H04B1/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using different frequencies for the two directions of communication</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/52" definition-exists="true" ipc-concordant="H04B1/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/52</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or <u>vice versa</u></text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/525" definition-exists="true" ipc-concordant="H04B1/525" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/525</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with means for reducing leakage of transmitter signal into the receiver</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/54" definition-exists="false" ipc-concordant="H04B1/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/54</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using the same frequency for two directions of communication </text><reference><text><class-ref scheme="cpc">H04B1/44</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/56" definition-exists="false" ipc-concordant="H04B1/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/56</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with provision for simultaneous communication in two directions</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/58" definition-exists="true" ipc-concordant="H04B1/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B1/58</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or <u>vice versa</u></text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/581" definition-exists="false" ipc-concordant="H04B1/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/581</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a transformer</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/582" definition-exists="false" ipc-concordant="H04B1/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/582</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with automatic balancing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/583" definition-exists="false" ipc-concordant="H04B1/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/583</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a bridge network</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/585" definition-exists="false" ipc-concordant="H04B1/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/585</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with automatic balancing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/586" definition-exists="false" ipc-concordant="H04B1/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/586</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an electronic circuit</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/587" definition-exists="true" ipc-concordant="H04B1/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/587</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using opto-couplers </text><reference><text>light transmission systems <class-ref scheme="cpc">H04B10/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/588" definition-exists="false" ipc-concordant="H04B1/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/588</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using sampling gates</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/59" definition-exists="true" ipc-concordant="H04B1/59" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/59</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Responders</text></title-part><title-part><text>Transponders</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/60" definition-exists="false" ipc-concordant="H04B1/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/60</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Supervising unattended repeaters</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/62" definition-exists="true" ipc-concordant="H04B1/62" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/62</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/64" definition-exists="true" ipc-concordant="H04B1/64" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/64</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Volume compression or expansion arrangements</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/66" definition-exists="true" ipc-concordant="H04B1/66" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/66</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>for reducing bandwidth of signals</text></title-part><title-part><text>for improving efficiency of transmission </text><reference><text><class-ref scheme="cpc">H04B1/68</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/662" definition-exists="false" ipc-concordant="H04B1/66" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/662</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a time/frequency relationship, e.g. time compression or expansion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/665" definition-exists="true" ipc-concordant="H04B1/66" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/665</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using psychoacoustic properties of the ear, e.g. masking effect</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/667" definition-exists="false" ipc-concordant="H04B1/66" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2014-11-01" status="published"><classification-symbol>H04B1/667</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a division in frequency subbands </text><reference><text>for TV signals  <class-ref scheme="cpc">H04N19/63</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/68" definition-exists="true" ipc-concordant="H04B1/68" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B1/68</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>for wholly or partially suppressing the carrier or one side band</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/69" definition-exists="true" ipc-concordant="H04B1/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/69</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Spread spectrum techniques</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B1/6904" definition-exists="false" ipc-concordant="H04B1/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/6904</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using code hopping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B1/6908" definition-exists="false" ipc-concordant="H04B1/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/6908</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using time hopping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B1/6912" definition-exists="false" ipc-concordant="H04B1/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/6912</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using chirp</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B1/6916" definition-exists="false" ipc-concordant="H04B1/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/6916</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Related theory</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/692" definition-exists="true" ipc-concordant="H04B1/692" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H04B1/692</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hybrid techniques using combinations of two or more spread spectrum techniques</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/707" definition-exists="true" ipc-concordant="H04B1/707" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/707</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using direct sequence modulation</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B1/70706" definition-exists="false" ipc-concordant="H04B1/707" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/70706</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a code tracking loop, e.g. a delay locked loop</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/70712" definition-exists="false" ipc-concordant="H04B1/707" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70712</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with demodulation by means of convolvers, e.g. of the SAW type </text><reference><text>SAW convolvers in general <class-ref scheme="cpc">G06G7/195</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/70718" definition-exists="false" ipc-concordant="H04B1/707" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70718</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with asynchronous demodulation, i.e. not requiring code synchronisation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B1/70724" definition-exists="false" ipc-concordant="H04B1/707" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/70724</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>featuring pilot assisted reception</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/7073" definition-exists="false" ipc-concordant="H04B1/7073" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7073</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Synchronisation aspects</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/70735" definition-exists="false" ipc-concordant="H04B1/7073" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70735</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Code identification </text><reference><text><class-ref scheme="cpc">H04B1/7083</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/7075" definition-exists="false" ipc-concordant="H04B1/7075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7075</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with code phase acquisition</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/70751" definition-exists="false" ipc-concordant="H04B1/7075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70751</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using partial detection </text><reference><text><class-ref scheme="cpc">H04B1/70758</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/70752" definition-exists="false" ipc-concordant="H04B1/7075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70752</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Partial correlation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/70753" definition-exists="false" ipc-concordant="H04B1/7075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70753</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Partial phase search</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/70754" definition-exists="false" ipc-concordant="H04B1/7075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70754</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Setting of search window, i.e. range of code offsets to be searched </text><reference><text><class-ref scheme="cpc">H04B1/70758</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/70755" definition-exists="false" ipc-concordant="H04B1/7075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70755</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Setting of lock conditions, e.g. threshold</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/70756" definition-exists="false" ipc-concordant="H04B1/7075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70756</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Jumping within the code, i.e. masking or slewing </text><reference><text><class-ref scheme="cpc">H04B1/70758</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/70757" definition-exists="false" ipc-concordant="H04B1/7075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70757</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with increased resolution, i.e. higher than half a chip </text><reference><text><class-ref scheme="cpc">H04B1/70758</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/70758" definition-exists="false" ipc-concordant="H04B1/7075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70758</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multimode search, i.e. using multiple search strategies</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/7077" definition-exists="false" ipc-concordant="H04B1/7077" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7077</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/70775" definition-exists="false" ipc-concordant="H04B1/7077" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/70775</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multi-dwell schemes, i.e. multiple accumulation times</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/708" definition-exists="false" ipc-concordant="H04B1/708" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/708</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Parallel implementation</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/7083" definition-exists="false" ipc-concordant="H04B1/7083" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7083</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cell search, e.g. using a three-step approach</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/7085" definition-exists="false" ipc-concordant="H04B1/7085" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7085</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a code tracking loop, e.g. a delay-locked loop</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="12" additional-only="true" sort-key="H04B1/70855" definition-exists="false" ipc-concordant="H04B1/7085" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/70855</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Dithering</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/7087" definition-exists="false" ipc-concordant="H04B1/7087" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7087</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Carrier synchronisation aspects</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/709" definition-exists="false" ipc-concordant="H04B1/709" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/709</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Correlator structure</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/7093" definition-exists="false" ipc-concordant="H04B1/7093" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7093</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Matched filter type</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="12" additional-only="true" sort-key="H04B1/70935" definition-exists="false" ipc-concordant="H04B1/7093" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/70935</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a bank of matched fileters, e.g. Fast Hadamard Transform</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/7095" definition-exists="false" ipc-concordant="H04B1/7095" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7095</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sliding correlator type</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/7097" definition-exists="false" ipc-concordant="H04B1/7097" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7097</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Interference-related aspects</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/71" definition-exists="false" ipc-concordant="H04B1/71" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/71</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the interference being narrowband interference</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/7101" definition-exists="false" ipc-concordant="H04B1/71" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7101</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with estimation filters</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/7102" definition-exists="false" ipc-concordant="H04B1/71" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7102</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with transform to frequency domain</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/7103" definition-exists="false" ipc-concordant="H04B1/7103" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7103</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the interference being multiple access interference</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/7105" definition-exists="false" ipc-concordant="H04B1/7105" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7105</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Joint detection techniques, e.g. linear detectors</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/71052" definition-exists="false" ipc-concordant="H04B1/7105" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/71052</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using decorrelation matrix</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/71055" definition-exists="false" ipc-concordant="H04B1/7105" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/71055</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using minimum mean squared error [MMSE] detector</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/71057" definition-exists="false" ipc-concordant="H04B1/7105" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/71057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using maximum-likelihood sequence estimation [MLSE]</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/7107" definition-exists="false" ipc-concordant="H04B1/7107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7107</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Subtractive interference cancellation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/71072" definition-exists="false" ipc-concordant="H04B1/7107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/71072</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Successive interference cancellation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/71075" definition-exists="false" ipc-concordant="H04B1/7107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/71075</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Parallel interference cancellation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="13" additional-only="true" sort-key="H04B1/71077" definition-exists="false" ipc-concordant="H04B1/7107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/71077</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Partial interference cancellation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/711" definition-exists="false" ipc-concordant="H04B1/711" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/711</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the interference being multi-path interference</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/7113" definition-exists="false" ipc-concordant="H04B1/7113" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7113</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Determination of path profile</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B1/7115" definition-exists="false" ipc-concordant="H04B1/7115" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-08-01" status="published"><classification-symbol>H04B1/7115</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Constructive combining of multi-path signals, i.e. RAKE receivers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/7117" definition-exists="false" ipc-concordant="H04B1/7117" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7117</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B1/712" definition-exists="false" ipc-concordant="H04B1/712" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/712</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/713" definition-exists="true" ipc-concordant="H04B1/713" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/713</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using frequency hopping</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/7136" definition-exists="false" ipc-concordant="H04B1/7136" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7136</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/71362" definition-exists="false" ipc-concordant="H04B1/7136" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/71362</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a bank of frequency sources</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/71365" definition-exists="false" ipc-concordant="H04B1/7136" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/71365</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using continuous tuning of a single frequency source</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/71367" definition-exists="false" ipc-concordant="H04B1/7136" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/71367</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a transform</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/7143" definition-exists="false" ipc-concordant="H04B1/7143" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7143</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for generation of hop patterns</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/715" definition-exists="false" ipc-concordant="H04B1/715" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/715</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Interference-related aspects</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/7152" definition-exists="false" ipc-concordant="H04B1/715" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/7152</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with means for suppressing interference</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/7154" definition-exists="false" ipc-concordant="H04B1/715" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/7154</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with means for preventing interference</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/7156" definition-exists="false" ipc-concordant="H04B1/7156" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7156</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for sequence synchronisation</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/71563" definition-exists="false" ipc-concordant="H04B1/7156" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/71563</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Acquisition</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B1/71566" definition-exists="false" ipc-concordant="H04B1/7156" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2001/71566</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tracking</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/7163" definition-exists="true" ipc-concordant="H04B1/7163" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H04B1/7163</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using impulse radio</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/71632" definition-exists="false" ipc-concordant="H04B1/7163" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/71632</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Signal aspects </text><reference><text><class-ref scheme="cpc">H04B1/7172</class-ref> and <class-ref scheme="cpc">H04B1/7176</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/71635" definition-exists="false" ipc-concordant="H04B1/7163" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/71635</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transmitter aspects </text><reference><text><class-ref scheme="cpc">H04B1/7174</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/71637" definition-exists="false" ipc-concordant="H04B1/7163" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/71637</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Receiver aspects </text><reference><text><class-ref scheme="cpc">H04B1/7183</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/717" definition-exists="false" ipc-concordant="H04B1/717" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H04B1/717</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pulse-related aspects</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/7172" definition-exists="false" ipc-concordant="H04B1/717" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7172</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pulse shape </text><reference><text>in general <class-ref scheme="cpc">H04L25/03834</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B1/7174" definition-exists="false" ipc-concordant="H04B1/717" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7174</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pulse generation </text><reference><text>in general <class-ref scheme="cpc">H04L25/03834</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/7176" definition-exists="false" ipc-concordant="H04B1/7176" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7176</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Data mapping, e.g. modulation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/7183" definition-exists="false" ipc-concordant="H04B1/7183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/7183</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Synchronisation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B1/719" definition-exists="false" ipc-concordant="H04B1/719" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/719</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Interference-related aspects</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/72" definition-exists="true" ipc-concordant="H04B1/72" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H04B1/72</classification-symbol><class-title date-revised="2018-01-01"><title-part><text>Circuits or components for simulating antennas, e.g. dummy antennas</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/74" definition-exists="false" ipc-concordant="H04B1/74" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/74</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for increasing reliability, e.g. using redundant or spare channels or apparatus </text><CPC-specific-text><reference><text>replacing by standby devices for amplifiers <class-ref scheme="cpc">H03F1/52</class-ref>, <class-ref scheme="cpc">H03F1/542</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B1/745" definition-exists="false" ipc-concordant="H04B1/74" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/745</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using by-passing or self-healing methods</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B1/76" definition-exists="true" ipc-concordant="H04B1/76" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B1/76</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pilot transmitters or receivers for control of transmission or for equalising</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B3/00" definition-exists="true" ipc-concordant="H04B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B3/00</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Line transmission systems </text><reference><text>combined with near-field transmission systems <class-ref scheme="cpc">H04B5/00</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B3/02" definition-exists="false" ipc-concordant="H04B3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/03" definition-exists="true" ipc-concordant="H04B3/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B3/03</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Hybrid circuits </text><reference><text>for transceivers <class-ref scheme="cpc">H04B1/52</class-ref>, <class-ref scheme="cpc">H04B1/58</class-ref></text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/04" definition-exists="true" ipc-concordant="H04B3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B3/04</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Control of transmission</text></title-part><title-part><text>Equalising</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/06" definition-exists="false" ipc-concordant="H04B3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by the transmitted signal</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/08" definition-exists="false" ipc-concordant="H04B3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in negative-feedback path of line amplifier</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/10" definition-exists="false" ipc-concordant="H04B3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by pilot signal</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/11" definition-exists="false" ipc-concordant="H04B3/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using pilot wire </text><reference><text><class-ref scheme="cpc">H04B3/12</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/12" definition-exists="false" ipc-concordant="H04B3/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in negative-feedback path of line amplifier</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/14" definition-exists="false" ipc-concordant="H04B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>characterised by the equalising network used</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/141" definition-exists="false" ipc-concordant="H04B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/141</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using multiequalisers, e.g. bump, cosine, Bode</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/142" definition-exists="false" ipc-concordant="H04B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/142</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using echo-equalisers, e.g. transversal</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/143" definition-exists="false" ipc-concordant="H04B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/143</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using amplitude-frequency equalisers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B3/144" definition-exists="false" ipc-concordant="H04B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/144</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>fixed equalizers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B3/145" definition-exists="false" ipc-concordant="H04B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/145</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>variable equalisers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/146" definition-exists="false" ipc-concordant="H04B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/146</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using phase-frequency equalisers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B3/147" definition-exists="false" ipc-concordant="H04B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/147</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>fixed equalisers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B3/148" definition-exists="false" ipc-concordant="H04B3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/148</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>variable equalisers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/16" definition-exists="false" ipc-concordant="H04B3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>characterised by the negative-impedance network used</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/18" definition-exists="false" ipc-concordant="H04B3/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>wherein the network comprises semiconductor devices</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/20" definition-exists="false" ipc-concordant="H04B3/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing echo effects or singing</text></title-part><title-part><text>Opening or closing transmitting path</text></title-part><title-part><text>Conditioning for transmission in one direction or the other</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/21" definition-exists="false" ipc-concordant="H04B3/21" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/21</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a set of bandfilters</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/23" definition-exists="false" ipc-concordant="H04B3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/23</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a replica of transmitted signal in the time domain, e.g. echo cancellers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/231" definition-exists="false" ipc-concordant="H04B3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/231</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Echo cancellers using readout of a memory to provide the echo replica</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/232" definition-exists="false" ipc-concordant="H04B3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/232</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using phase shift, phase roll or frequency offset correction</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/234" definition-exists="false" ipc-concordant="H04B3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/234</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using double talk detection</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/235" definition-exists="false" ipc-concordant="H04B3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/235</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>combined with adaptive equaliser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/237" definition-exists="false" ipc-concordant="H04B3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/237</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using two adaptive filters, e.g. for near end and for end echo cancelling</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/238" definition-exists="false" ipc-concordant="H04B3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/238</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using initial training sequence</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/26" definition-exists="true" ipc-concordant="H04B3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B3/26</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Improving frequency characteristic by the use of loading coils</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/28" definition-exists="false" ipc-concordant="H04B3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H04B3/28</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Reducing interference caused by currents induced in cable sheathing or armouring</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/30" definition-exists="false" ipc-concordant="H04B3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing interference caused by unbalance current in a normally balanced line</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/32" definition-exists="false" ipc-concordant="H04B3/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing cross-talk, e.g. by compensating</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/34" definition-exists="false" ipc-concordant="H04B3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H04B3/34</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>by systematic interconnection of lengths of cable during laying</text></title-part><title-part><text>by addition of balancing components to cable during laying</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/36" definition-exists="true" ipc-concordant="H04B3/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B3/36</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Repeater circuits </text><reference><text><class-ref scheme="cpc">H04B3/58</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/38" definition-exists="false" ipc-concordant="H04B3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for signals in two different frequency ranges transmitted in opposite directions over the same transmission path</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/40" definition-exists="false" ipc-concordant="H04B3/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Artificial lines</text></title-part><title-part><text>Networks simulating a line of certain length</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/42" definition-exists="false" ipc-concordant="H04B3/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/42</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Circuits for by-passing of ringing signals</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/44" definition-exists="false" ipc-concordant="H04B3/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/44</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for feeding power to a repeater along the transmission line</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/46" definition-exists="false" ipc-concordant="H04B3/46" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/46</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Monitoring</text></title-part><title-part><text>Testing</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/462" definition-exists="false" ipc-concordant="H04B3/462" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B3/462</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Testing group delay or phase shift, e.g. timing jitter</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B3/466" definition-exists="false" ipc-concordant="H04B3/466" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B3/466</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Testing attenuation in combination with at least one of group delay and phase shift</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/48" definition-exists="false" ipc-concordant="H04B3/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B3/48</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Testing attenuation </text><reference><text><class-ref scheme="cpc">H04B3/466</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/487" definition-exists="false" ipc-concordant="H04B3/487" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B3/487</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Testing crosstalk effects</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B3/493" definition-exists="false" ipc-concordant="H04B3/493" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B3/493</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Testing echo effects or singing</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B3/50" definition-exists="false" ipc-concordant="H04B3/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Systems for transmission between fixed stations via two-conductor transmission lines </text><reference><text><class-ref scheme="cpc">H04B3/54</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B3/52" definition-exists="false" ipc-concordant="H04B3/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/52</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Systems for transmission between fixed stations via waveguides</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B3/54" definition-exists="false" ipc-concordant="H04B3/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/54</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Systems for transmission via power distribution lines</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/542" definition-exists="false" ipc-concordant="H04B3/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/542</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the information being in digital form</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/544" definition-exists="false" ipc-concordant="H04B3/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/544</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Setting up communications; Call and signalling arrangements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/546" definition-exists="false" ipc-concordant="H04B3/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/546</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Combination of signalling, telemetering, protection </text><reference><text>circuits for remote indication of supply or distribution network condition <class-ref scheme="cpc">H02J13/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/548" definition-exists="false" ipc-concordant="H04B3/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/548</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the power on the line being DC </text><reference><text>arrangements for feeding power <class-ref scheme="cpc">H04L12/10</class-ref>; extracting feeding power from signals <class-ref scheme="cpc">H04L25/02</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/56" definition-exists="false" ipc-concordant="H04B3/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/56</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Circuits for coupling, blocking, or by-passing of signals</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B3/58" definition-exists="true" ipc-concordant="H04B3/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B3/58</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Repeater circuits</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B3/60" definition-exists="false" ipc-concordant="H04B3/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B3/60</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Systems for communication between relatively movable stations, e.g. for communication with lift </text><reference><text><class-ref scheme="cpc">H04B3/54</class-ref> takes precedence</text></reference></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B5/00" definition-exists="true" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Near-field transmission systems, e.g. inductive loop type</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B5/0006" definition-exists="false" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a receiver structurally associated with a loudspeaker or an earphone</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B5/0012" definition-exists="false" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0012</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using capacitive coupling</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B5/0018" definition-exists="false" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0018</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using leaky or radiating cables, e.g. leaky coaxial cables or power lines for inductive transmission </text><reference><text>leaky cables <u>per se</u> <class-ref scheme="cpc">H01Q13/20</class-ref>; for railways <class-ref scheme="cpc">B61L3/22</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B5/0025" definition-exists="false" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Near field system adaptations</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B5/0031" definition-exists="true" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0031</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for data transfer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B5/0037" definition-exists="true" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0037</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for power transfer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B5/0043" definition-exists="false" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0043</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for taking measurements, e.g. using sensor coils</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B5/005" definition-exists="false" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for isolation purposes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B5/0056" definition-exists="true" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0056</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for use in interrogation, identification or read/write systems </text><reference><text>record carriers <class-ref scheme="cpc">G06K7/00</class-ref>, <class-ref scheme="cpc">G06K19/00</class-ref>; for railways <class-ref scheme="cpc">B61L3/12</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B5/0062" definition-exists="true" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0062</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in RFID [Radio Frequency Identification] Systems</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B5/0068" definition-exists="false" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in transponders</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B5/0075" definition-exists="true" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0075</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using inductive coupling </text><reference><text>transformers or inductances adapted for inductive coupling <class-ref scheme="cpc">H01F38/14</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B5/0081" definition-exists="true" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with antenna coils </text><reference><text>loop aerials <class-ref scheme="cpc">H01Q7/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B5/0087" definition-exists="false" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0087</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with multiple coils at either side</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B5/0093" definition-exists="false" ipc-concordant="H04B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/0093</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with one coil at each side, e.g. with primary and secondary coils</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B5/02" definition-exists="false" ipc-concordant="H04B5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using transceiver</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B5/04" definition-exists="false" ipc-concordant="H04B5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Calling systems, e.g. paging system</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B5/06" definition-exists="false" ipc-concordant="H04B5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B5/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a portable transmitter associated with a microphone</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B7/00" definition-exists="true" ipc-concordant="H04B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Radio transmission systems, i.e. using radiation field </text><reference><text><class-ref scheme="cpc">H04B10/00</class-ref>, <class-ref scheme="cpc">H04B15/00</class-ref> take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B7/002" definition-exists="false" ipc-concordant="H04B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reducing depolarization effects</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B7/005" definition-exists="true" ipc-concordant="H04B7/005" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Control of transmission</text></title-part><title-part><text>Equalising</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B7/01" definition-exists="true" ipc-concordant="H04B7/01" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing phase shift</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B7/015" definition-exists="false" ipc-concordant="H04B7/015" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/015</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing echo effects</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B7/02" definition-exists="true" ipc-concordant="H04B7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-08-01" status="published"><classification-symbol>H04B7/02</classification-symbol><class-title date-revised="2018-01-01"><title-part><text>Diversity systems</text></title-part><title-part><text>Multi-antenna system, i.e. transmission or reception using multiple antennas </text><reference><text>RAKE receivers <class-ref scheme="cpc">H04B1/7115</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B7/022" definition-exists="true" ipc-concordant="H04B7/022" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/022</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Site diversity</text></title-part><title-part><text>Macro-diversity </text><reference><text>using two or more spaced independent antennas <class-ref scheme="cpc">H04B7/04</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/024" definition-exists="true" ipc-concordant="H04B7/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/024</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/026" definition-exists="true" ipc-concordant="H04B7/026" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/026</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Co-operative diversity, e.g. using fixed or mobile stations as relays</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B7/028" definition-exists="true" ipc-concordant="H04B7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Spatial transmit diversity using a single antenna at the transmitter</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B7/04" definition-exists="true" ipc-concordant="H04B7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/04</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>using two or more spaced independent antennas</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/0404" definition-exists="false" ipc-concordant="H04B7/0404" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/0404</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>the mobile station comprising multiple antennas, e.g. to provide uplink diversity</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/0408" definition-exists="true" ipc-concordant="H04B7/0408" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/0408</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>using two or more beams, i.e. beam diversity</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/0413" definition-exists="true" ipc-concordant="H04B7/0413" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H04B7/0413</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>MIMO systems</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0417" definition-exists="true" ipc-concordant="H04B7/0417" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/0417</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Feedback systems</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0421" definition-exists="true" ipc-concordant="H04B7/0417" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0421</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>utilizing implicit feedback, e.g. steered pilot signals</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0426" definition-exists="true" ipc-concordant="H04B7/0426" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/0426</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Power distribution</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/043" definition-exists="false" ipc-concordant="H04B7/0426" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/043</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using best eigenmode, e.g. beam forming or beam steering</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0434" definition-exists="false" ipc-concordant="H04B7/0426" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0434</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using multiple eigenmodes</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0439" definition-exists="false" ipc-concordant="H04B7/0426" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0439</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>utilizing channel inversion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0443" definition-exists="false" ipc-concordant="H04B7/0426" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0443</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>utilizing &quot;waterfilling&quot; technique</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0447" definition-exists="false" ipc-concordant="H04B7/0426" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0447</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>utilizing uniform distribution</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0452" definition-exists="false" ipc-concordant="H04B7/0452" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/0452</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Multi-user MIMO systems</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0456" definition-exists="false" ipc-concordant="H04B7/0456" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/0456</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/046" definition-exists="false" ipc-concordant="H04B7/0456" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>taking physical layer constraints into account</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0465" definition-exists="false" ipc-concordant="H04B7/0456" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0465</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0469" definition-exists="false" ipc-concordant="H04B7/0456" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0469</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>taking special antenna structures, e.g. cross polarized antennas into account</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0473" definition-exists="false" ipc-concordant="H04B7/0456" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0473</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>taking constraints in layer or codeword to antenna mapping into account</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0478" definition-exists="false" ipc-concordant="H04B7/0456" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0478</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Special codebook structures directed to feedback optimization</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0482" definition-exists="false" ipc-concordant="H04B7/0456" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0482</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Adaptive codebooks</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0486" definition-exists="false" ipc-concordant="H04B7/0456" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H04B7/0486</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>taking channel rank into account</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/0491" definition-exists="true" ipc-concordant="H04B7/0491" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/0491</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>using two or more sectors, i.e. sector diversity</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0495" definition-exists="false" ipc-concordant="H04B7/0495" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/0495</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>using overlapping sectors in the same base station to implement MIMO for antennas</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/06" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/06</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>at the transmitting station</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0602" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0602</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using antenna switching </text><reference><text><class-ref scheme="cpc">H04B7/0686</class-ref> takes precedence; antenna beam directivity switching <class-ref scheme="cpc">H01Q3/24</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0604" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0604</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with predefined switching scheme</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0606" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0606</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Random or pseudo-random switching scheme</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0608" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0608</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Antenna selection according to transmission parameters</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/061" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/061</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using feedback from receiving side</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0613" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0613</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using simultaneous transmission </text><reference><text><class-ref scheme="cpc">H04B7/0686</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0615" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0615</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of weighted versions of same signal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0617" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0617</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for beam forming</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0619" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0619</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using feedback from receiving side </text><reference><text>feedback signaling for adaptive modulation/coding <class-ref scheme="cpc">H04L1/0001</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/0621" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0621</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feedback content</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0623" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0623</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Auxiliary parameters, e.g. power control [PCB] or not acknowledged commands [NACK], used as feedback information</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0626" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0626</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Channel coefficients, e.g. channel state information [CSI]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0628" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0628</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Diversity capabilities</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/063" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Parameters other than those covered in groups <class-ref scheme="cpc">H04B7/0623</class-ref> - <class-ref scheme="cpc">H04B7/0634</class-ref>, e.g. channel matrix rank or transmit mode selection</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0632" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0632</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Channel quality parameters, e.g. channel quality indicator [CQI]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0634" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0634</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Antenna weights or vector/matrix coefficients</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/0636" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0636</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feedback format</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0639" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0639</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0641" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0641</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Differential feedback</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0643" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0643</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feedback on request</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0645" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0645</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Variable feedback</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="16" additional-only="false" sort-key="H04B7/0647" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0647</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Variable feedback rate</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="16" additional-only="false" sort-key="H04B7/065" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Variable contents, e.g. long-term or short-short</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/0652" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0652</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feedback error handling</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0654" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0654</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>at the receiver, e.g. antenna verification at mobile station</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0656" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0656</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>at the transmitter, e.g. error detection at base station</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/0658" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0658</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feedback reduction</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/066" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/0663" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0663</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using vector or matrix manipulations</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0665" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0665</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feed forward of transmit weights to the receiver</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0667" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0667</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of delayed versions of same signal </text><reference><text>using space-time coding <class-ref scheme="cpc">H04L1/0618</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0669" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0669</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using different channel coding between antennas </text><reference><text>space-time coding <class-ref scheme="cpc">H04L1/0618</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0671" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0671</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using different delays between antennas</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0673" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0673</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using feedback from receiving side</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0676" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0676</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using random or pseudo-random delays</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0678" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0678</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using different spreading codes between antennas </text><reference><text>code allocation <class-ref scheme="cpc">H04J13/16</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/068" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using space frequency diversity </text><reference><text>space-frequency coding <class-ref scheme="cpc">H04L1/0606</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0682" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0682</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using phase diversity (e.g. phase sweeping)</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0684" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0684</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using different training sequences per antenna</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0686" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0686</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hybrid systems, i.e. switching and simultaneous transmission</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0689" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0689</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using different transmission schemes, at least one of them being a diversity transmission scheme</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0691" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0691</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using subgroups of transmit antennas</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0693" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0693</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>switching off a diversity branch, e.g. to save power</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0695" definition-exists="false" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0695</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using beam selection</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0697" definition-exists="true" ipc-concordant="H04B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0697</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using spatial multiplexing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/08" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/08</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>at the receiving station</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0802" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0802</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using antenna selection </text><reference><text><class-ref scheme="cpc">H04B7/0868</class-ref> takes precedence; antenna beam directivity switching <class-ref scheme="cpc">H01Q3/24</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0805" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0805</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with single receiver and antenna switching </text><reference><text><class-ref scheme="cpc">H04B7/0822</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0808" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0808</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comparing all antennas before reception</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/0811" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0811</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>during preamble or gap period</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0814" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0814</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on current reception conditions, e.g. switching to different antenna when signal level is below threshold</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0817" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0817</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with multiple receivers and antenna path selection</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/082" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>selecting best antenna path</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0822" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0822</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>according to predefined selection scheme</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0825" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0825</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with main and with auxiliary or diversity antennas</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0828" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0828</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with delay elements in antenna paths</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0831" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0831</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Compensation of the diversity switching process for non-uniform properties or faulty operations of the switches used in the diversity switching process</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0834" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0834</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on external parameters, e.g. subscriber speed or location</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0837" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0837</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using pre-detection combining </text><reference><text><class-ref scheme="cpc">H04B7/0868</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/084" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/084</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Equal gain combining, only phase adjustments </text><reference><text>antenna beam scanning or forming by phase or amplitude control <class-ref scheme="cpc">H01Q3/26</class-ref>, e.g. phased arrays</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0842" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0842</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Weighted combining</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0845" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0845</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch </text><reference><text>rake receivers as such <class-ref scheme="cpc">H04B1/7115</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0848" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0848</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Joint weighting</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/0851" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0851</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using training sequences or error signal </text><reference><text>minimizing error signal <class-ref scheme="cpc">H04B7/0854</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/0854" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0854</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using error minimizing algorithms, e.g. minimum mean squared error [MMSE], &quot;cross-correlation&quot; or matrix inversion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/0857" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0857</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/086" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0862" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0862</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>receiver computing weights based on information from the transmitter</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0865" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0865</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Independent weighting, i.e. weights based on own antenna reception parameters</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0868" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0868</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hybrid systems, i.e. switching and combining</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0871" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0871</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using different reception schemes, at least one of them being a diversity reception scheme</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0874" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0874</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using subgroups of receive antennas</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/0877" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0877</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>switching off a diversity branch, e.g. to save power</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/088" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/088</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using beam selection</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0882" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0882</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using post-detection diversity</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0885" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0885</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with combination</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0888" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0888</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with selection</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/0891" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0891</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Space-time diversity </text><reference><text>rake receivers <class-ref scheme="cpc">H04B1/7115</class-ref>; space-time decoding <class-ref scheme="cpc">H04L1/0631</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0894" definition-exists="false" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0894</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using different delays between antennas</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/0897" definition-exists="true" ipc-concordant="H04B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/0897</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using beamforming per multi-path, e.g. to cope with different directions of arrival [DOA] at different multi-paths</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B7/10" definition-exists="false" ipc-concordant="H04B7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/10</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Polarisation diversity</text></title-part><title-part><text>Directional diversity</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B7/12" definition-exists="false" ipc-concordant="H04B7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/12</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Frequency diversity</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B7/14" definition-exists="true" ipc-concordant="H04B7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/14</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Relay systems</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B7/145" definition-exists="true" ipc-concordant="H04B7/145" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/145</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>Passive relay systems</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B7/15" definition-exists="false" ipc-concordant="H04B7/15" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Active relay systems</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/155" definition-exists="true" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B7/155</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Ground-based stations </text><reference><text><class-ref scheme="cpc">H04B7/204</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/15507" definition-exists="true" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15507</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Relay station based processing for cell extension or control of coverage area, </text><reference><text>network planning with network coordinated processing with regard to cell extension <class-ref scheme="cpc">H04W16/26</class-ref>; network topologies using dedicated repeater stations <class-ref scheme="cpc">H04W84/047</class-ref>; terminal devices adapted for relaying to or from an other terminal <class-ref scheme="cpc">H04W88/04</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/15514" definition-exists="true" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15514</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for shadowing compensation </text><reference><text>for satellite mobile telephony service systems <class-ref scheme="cpc">H04B7/18536</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/15521" definition-exists="true" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15521</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>combining by calculations packets received from different stations before transmitting the combined packets as part of network coding </text><reference><text>network coding aspects for detection or prevention of errors in the information received <class-ref scheme="cpc">H04L1/0076</class-ref>; network traffic management with optimizing of information sizing, e.g. header compression, by using assembly and disassembly of packets <class-ref scheme="cpc">H04W28/065</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/15528" definition-exists="false" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15528</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control of operation parameters of a relay station to exploit the physical medium</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/15535" definition-exists="true" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15535</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control of relay amplifier gain </text><reference><text>amplifier gain control in general <class-ref scheme="cpc">H03G3/00</class-ref>; gain control reducing self - or loop interference <class-ref scheme="cpc">H04B7/15578</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/15542" definition-exists="true" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15542</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Selecting at relay station its transmit and receive resources </text><reference><text>selection of wireless resources by user or terminal <class-ref scheme="cpc">H04W72/02</class-ref>; arrangements affording multiple use of the transmission path by two-dimensional division of the resources <class-ref scheme="cpc">H04L5/0003</class-ref>, or by allocating sub-channels <class-ref scheme="cpc">H04L5/003</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/1555" definition-exists="false" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H04B7/1555</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>Selecting relay station antenna mode, e.g. selecting omnidirectional -, directional beams, selecting polarizations</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/15557" definition-exists="false" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H04B7/15557</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/15564" definition-exists="false" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15564</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Relay station antennae loop interference reduction</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/15571" definition-exists="false" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H04B7/15571</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>by signal isolation, e.g. isolation by frequency or by antenna pattern, or by polarization</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/15578" definition-exists="false" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15578</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by gain adjustment</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/15585" definition-exists="false" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15585</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by interference cancellation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/15592" definition-exists="true" ipc-concordant="H04B7/155" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/15592</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path </text><reference><text>cooperative diversity <class-ref scheme="cpc">H04B7/024</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/165" definition-exists="true" ipc-concordant="H04B7/165" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>employing angle modulation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/17" definition-exists="true" ipc-concordant="H04B7/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/17</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>employing pulse modulation, e.g. pulse code modulation</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/185" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/185</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Space-based or airborne stations; </text><CPC-specific-text><text>Stations for satellite systems</text></CPC-specific-text><reference><text><class-ref scheme="cpc">H04B7/204</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/18502" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18502</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Airborne stations</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18504" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18504</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Aircraft used as relay or high altitude atmospheric platform</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18506" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18506</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Communications with or from aircraft, i.e. aeronautical mobile service</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/18508" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18508</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with satellite system used as relay, i.e. aeronautical mobile satellite service</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/1851" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H04B7/1851</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>Systems using a satellite or space-based relay </text><reference><text><class-ref scheme="cpc">H04B7/18508</class-ref>, <class-ref scheme="cpc">H04B7/18521</class-ref> take precedence; providing specific services <class-ref scheme="cpc">H04B7/18523</class-ref>&#160;-&#160;<class-ref scheme="cpc">H04B7/18576</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18513" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18513</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transmission in a satellite or space-based system</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18515" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18515</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transmission equipment in satellites or space-based relays</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18517" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18517</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transmission equipment in earth stations</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18519" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18519</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Operations control, administration or maintenance</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/18521" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-07-01" status="published"><classification-symbol>H04B7/18521</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Systems of inter linked satellites, i.e. inter satellite service </text><reference><text>for optical links between satellites <class-ref scheme="cpc">H04B10/118</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/18523" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18523</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service </text><reference><text>arrangements specially adapted for satellite broadcast receiving <class-ref scheme="cpc">H04H40/90</class-ref>; picture transmission via satellite <class-ref scheme="cpc">H04N1/00103</class-ref>; television transmission via satellite <class-ref scheme="cpc">H04N7/20</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18526" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18526</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for data linking, networking or transporting, or for controlling an end to end session </text><reference><text>data switching networks <class-ref scheme="cpc">H04L12/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/18528" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18528</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Satellite systems for providing two-way communications service to a network of fixed stations, i.e. fixed satellite service or very small aperture terminal [VSAT] system</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/1853" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-09-03" status="published"><classification-symbol>H04B7/1853</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service </text><reference><text>for selecting <class-ref scheme="cpc">H04W</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18532" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18532</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for managing transmission, i.e. for transporting data or a signalling message</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/18534" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18534</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for enhancing link reliablility, e.g. satellites diversity</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/18536" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18536</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Shadowing compensation therefor, e.g. by using an additional terrestrial relay</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18539" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18539</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for managing radio, resources, i.e. for establishing or releasing a connection</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/18541" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18541</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for handover of resources</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/18543" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18543</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for adaptation of transmission parameters, e.g. power control </text><reference><text>for detecting or preventing errors in the information received <class-ref scheme="cpc">H04L1/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18545" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18545</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for managing station mobility, i.e. for station registration or localisation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/18547" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18547</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for geolocalisation of a station </text><reference><text>position fixing by direction or distance determination <class-ref scheme="cpc">G01S5/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/1855" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/1855</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a telephonic control signal, e.g. propagation delay variation, Doppler frequency variation, power variation, beam identification</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="15" additional-only="false" sort-key="H04B7/18552" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18552</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a telephonic control signal and a second ranging satellite </text><reference><text>determining absolute distances from a plurality of spaced points of known location <class-ref scheme="cpc">G01S5/14</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/18554" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18554</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using the position provided by an existing geolocalisation system</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/18556" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18556</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a location database</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18558" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18558</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/1856" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/1856</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for call routing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18563" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18563</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for interconnecting multiple systems </text><reference><text>data switching networks <class-ref scheme="cpc">H04L12/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18565" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18565</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for preventing unauthorised access or for providing user protection </text><reference><text>arrangements for secret or secure communication <class-ref scheme="cpc">H04L9/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18567" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18567</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for providing additional services to the basic mobile satellite telephony service</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18569" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18569</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/18571" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18571</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for satellites; for fixed or mobile stations</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/18573" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18573</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for operations control, administration or maintenance</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/18576" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-09-03" status="published"><classification-symbol>H04B7/18576</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Satellite systems for providing narrowband data service to fixed or mobile stations, e.g. using a minisatellite, a microsatellite </text><reference><text>for selecting <class-ref scheme="cpc">H04W</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/18578" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-09-03" status="published"><classification-symbol>H04B7/18578</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Satellite systems for providing broadband data service to individual earth stations </text><reference><text>for selecting <class-ref scheme="cpc">H04W</class-ref>; provisions for broadband connection, <class-ref scheme="cpc">H04Q11/0478</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/1858" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/1858</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for data transmission on the physical system, i.e. for data bit transmission between network components</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18582" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18582</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18584" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18584</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for data networking, i.e. for data packet routing, for congestion control </text><reference><text>data switching networks <class-ref scheme="cpc">H04L12/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18586" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18586</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for data transporting, e.g. for an end to end data transport or check</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18589" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18589</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for controlling an end to end session, i.e. for initialising, synchronising or terminating an end to end link</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18591" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18591</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for interconnecting multiple systems </text><reference><text>data switching networks <class-ref scheme="cpc">H04L12/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18593" definition-exists="true" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18593</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for preventing unauthorised access or for providing user protection </text><reference><text>arrangements for secret or secure communication <class-ref scheme="cpc">H04L9/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18595" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18595</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for adapting broadband applications to satellite systems</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/18597" definition-exists="false" ipc-concordant="H04B7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/18597</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for system physical machines management, i.e. for construction, operations control, administration, maintenance</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/19" definition-exists="true" ipc-concordant="H04B7/19" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/19</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Earth-synchronous stations</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/195" definition-exists="true" ipc-concordant="H04B7/195" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/195</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Non-synchronous stations</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/204" definition-exists="true" ipc-concordant="H04B7/204" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/204</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multiple access</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2041" definition-exists="true" ipc-concordant="H04B7/204" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2041</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Spot beam multiple access</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2043" definition-exists="true" ipc-concordant="H04B7/204" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2043</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Mixed mode, TDM and FDM systems</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2045" definition-exists="true" ipc-concordant="H04B7/204" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>SS-FDMA, FDMA satellite switching</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2046" definition-exists="true" ipc-concordant="H04B7/204" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>SS-TDMA, TDMA satellite switching</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/2048" definition-exists="true" ipc-concordant="H04B7/204" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2048</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Frame structure, synchronisation or frame acquisition in SS-TDMA systems</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/208" definition-exists="true" ipc-concordant="H04B7/208" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/208</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Frequency-division multiple access </text><CPC-specific-text><text>[FDMA]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/212" definition-exists="true" ipc-concordant="H04B7/212" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/212</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Time-division multiple access </text><CPC-specific-text><text>[TDMA]</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/2121" definition-exists="true" ipc-concordant="H04B7/212" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2121</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Channels assignment to the different stations</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/2123" definition-exists="true" ipc-concordant="H04B7/212" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2123</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Variable assignment, e.g. demand assignment</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/2125" definition-exists="true" ipc-concordant="H04B7/212" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Synchronisation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/2126" definition-exists="true" ipc-concordant="H04B7/212" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2126</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a reference station</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/2128" definition-exists="true" ipc-concordant="H04B7/212" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2128</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Changing of the reference station</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/216" definition-exists="true" ipc-concordant="H04B7/216" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B7/216</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Code division or spread-spectrum multiple access </text><CPC-specific-text><text>[CDMA, SSMA]</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B7/22" definition-exists="true" ipc-concordant="H04B7/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H04B7/22</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Scatter propagation systems </text><CPC-specific-text><text>, e.g. ionospheric, tropospheric or meteor scatter</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B7/24" definition-exists="true" ipc-concordant="H04B7/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>H04B7/24</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>for communication between two or more posts </text><reference><text>wireless communication networks <class-ref scheme="cpc">H04W</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B7/26" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>at least one of which is mobile</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/2603" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2603</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for wireless physical layer control </text><reference><text><class-ref scheme="cpc">H04B7/2612</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2606" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2606</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for base station coverage control, e.g. by using relays in tunnels</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2609" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2609</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for range control, e.g. by using remote antennas</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/2612" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H04B7/2612</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity </text><reference><text><class-ref scheme="cpc">H04B7/2615</class-ref>&#160;-&#160;<class-ref scheme="cpc">H04B7/2643</class-ref> take precedence; provision for broadband connection <class-ref scheme="cpc">H04Q11/0478</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/2615" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2615</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using hybrid frequency-time division multiple access [FDMA-TDMA]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/2618" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2618</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using hybrid code-time division multiple access [CDMA-TDMA]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/2621" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2621</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using frequency division multiple access [FDMA] </text><reference><text><class-ref scheme="cpc">H04B7/2615</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/2625" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2625</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using common wave</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/2628" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2628</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] </text><reference><text><class-ref scheme="cpc">H04B7/2618</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2631" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2631</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for broadband transmission</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2634" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2634</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for channel frequency control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2637" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2637</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for logical channel control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/264" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/264</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for data rate control</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/2643" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2643</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using time-division multiple access [TDMA] </text><reference><text><class-ref scheme="cpc">H04B7/2615</class-ref>, <class-ref scheme="cpc">H04B7/2618</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2646" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2646</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for broadband transmission</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/265" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/265</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for channel frequency control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2653" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2653</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for logical channel control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2656" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2656</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for structure of frame, burst</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2659" definition-exists="false" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2659</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for data rate control</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B7/2662" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2662</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for Wireless System Synchronisation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2665" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2665</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for Wireless Frequency Division Multiple Access [FDMA] System Synchronisation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2668" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-11-01" status="published"><classification-symbol>H04B7/2668</classification-symbol><class-title date-revised="2015-11-01"><title-part><CPC-specific-text><text>Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation, </text><reference><text>for code acquisition <class-ref scheme="cpc">H04B1/7075</class-ref>, for code tracking <class-ref scheme="cpc">H04B1/7085</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B7/2671" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2671</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/2675" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2675</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Frequency synchronisation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B7/2678" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2678</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Time synchronisation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/2681" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2681</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Synchronisation of a mobile station with one base station</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/2684" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2684</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Synchronisation of a mobile station with more than one base station</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B7/2687" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2687</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Inter base stations synchronisation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/269" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/269</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Master/slave synchronisation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/2693" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B7/2693</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Centralised synchronisation, i.e. using external universal time reference, e.g. by using a global positioning system [GPS] or by distributing time reference over the wireline network</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H04B7/2696" definition-exists="true" ipc-concordant="H04B7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-09-01" status="published"><classification-symbol>H04B7/2696</classification-symbol><class-title date-revised="2015-09-01"><title-part><CPC-specific-text><text>Over the air autonomous synchronisation, e.g. by monitoring network activity </text><reference><text><class-ref scheme="cpc">H04B7/2693</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B10/00" definition-exists="true" ipc-concordant="H04B10/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> In this group, non-optical transmission systems are classified in group <class-ref scheme="cpc">H04B10/90</class-ref>.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/03" definition-exists="true" ipc-concordant="H04B10/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for fault recovery</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/032" definition-exists="true" ipc-concordant="H04B10/032" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/032</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using working and protection systems </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H04J14/0287</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/035" definition-exists="true" ipc-concordant="H04B10/035" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/035</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using loopbacks</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/038" definition-exists="true" ipc-concordant="H04B10/038" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/038</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using bypasses</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/07" definition-exists="true" ipc-concordant="H04B10/07" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for monitoring or testing transmission systems</text></title-part><title-part><text>Arrangements for fault measurement of transmission systems</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/071" definition-exists="true" ipc-concordant="H04B10/071" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-02-01" status="published"><classification-symbol>H04B10/071</classification-symbol><class-title date-revised="2023-02-01"><title-part><text>using a reflected signal, e.g. using optical time domain reflectometers [OTDR]</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/073" definition-exists="true" ipc-concordant="H04B10/073" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/073</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using an out-of-service signal </text><reference><text><class-ref scheme="cpc">H04B10/071</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/0731" definition-exists="false" ipc-concordant="H04B10/073" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0731</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Testing or characterisation of optical devices, e.g. amplifiers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/075" definition-exists="true" ipc-concordant="H04B10/075" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/075</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using an in-service signal </text><reference><text><class-ref scheme="cpc">H04B10/071</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/077" definition-exists="true" ipc-concordant="H04B10/077" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/077</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a supervisory or additional signal</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0771" definition-exists="false" ipc-concordant="H04B10/077" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0771</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fault location on the transmission path</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0773" definition-exists="false" ipc-concordant="H04B10/077" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0773</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Network aspects, e.g. central monitoring of transmission parameters</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0775" definition-exists="false" ipc-concordant="H04B10/077" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0775</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Performance monitoring and measurement of transmission parameters</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0777" definition-exists="false" ipc-concordant="H04B10/077" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0777</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Monitoring line amplifier or line repeater equipment</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0779" definition-exists="false" ipc-concordant="H04B10/077" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0779</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Monitoring line transmitter or line receiver equipment</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/079" definition-exists="true" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/079</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using measurements of the data signal</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0791" definition-exists="false" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0791</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fault location on the transmission path</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0793" definition-exists="false" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0793</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Network aspects, e.g. central monitoring of transmission parameters</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0795" definition-exists="false" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0795</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Performance monitoring; Measurement of transmission parameters</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/07951" definition-exists="false" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/07951</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Monitoring or measuring chromatic dispersion or PMD</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/07953" definition-exists="false" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/07953</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Monitoring or measuring OSNR, BER or Q</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/07955" definition-exists="false" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/07955</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Monitoring or measuring power</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/07957" definition-exists="false" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/07957</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Monitoring or measuring wavelength</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0797" definition-exists="false" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0797</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Monitoring line amplifier or line repeater equipment</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/0799" definition-exists="false" ipc-concordant="H04B10/079" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/0799</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Monitoring line transmitter or line receiver equipment</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/11" definition-exists="true" ipc-concordant="H04B10/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements specific to free-space transmission, i.e. transmission through air or vacuum</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/112" definition-exists="true" ipc-concordant="H04B10/112" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/112</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Line-of-sight transmission over an extended range</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/1121" definition-exists="false" ipc-concordant="H04B10/112" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/1121</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>One-way transmission</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/1123" definition-exists="false" ipc-concordant="H04B10/112" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/1123</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bidirectional transmission</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/1125" definition-exists="false" ipc-concordant="H04B10/112" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/1125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a single common optical path</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/1127" definition-exists="false" ipc-concordant="H04B10/112" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/1127</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using two distinct parallel optical paths</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/1129" definition-exists="true" ipc-concordant="H04B10/112" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/1129</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for outdoor wireless networking of information</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/114" definition-exists="true" ipc-concordant="H04B10/114" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/114</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indoor or close-range type systems</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/1141" definition-exists="true" ipc-concordant="H04B10/114" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/1141</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>One-way transmission</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/1143" definition-exists="false" ipc-concordant="H04B10/114" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/1143</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bidirectional transmission</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/1149" definition-exists="true" ipc-concordant="H04B10/114" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/1149</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for indoor wireless networking of information</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/116" definition-exists="true" ipc-concordant="H04B10/116" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H04B10/116</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Visible light communication</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/118" definition-exists="true" ipc-concordant="H04B10/118" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/118</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>specially adapted for satellite communication</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/25" definition-exists="true" ipc-concordant="H04B10/25" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/25</classification-symbol><class-title date-revised="2020-05-01"><title-part><text>Arrangements specific to fibre transmission</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/2507" definition-exists="true" ipc-concordant="H04B10/2507" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2507</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for the reduction or elimination of distortion or dispersion</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/25073" definition-exists="false" ipc-concordant="H04B10/2507" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25073</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using spectral equalisation, e.g. spectral filtering</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/25077" definition-exists="false" ipc-concordant="H04B10/2507" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25077</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using soliton propagation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/2513" definition-exists="true" ipc-concordant="H04B10/2513" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2513</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>due to chromatic dispersion</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/25133" definition-exists="true" ipc-concordant="H04B10/2513" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/25133</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>including a lumped electrical or optical dispersion compensator </text><reference><text><class-ref scheme="cpc">H04B10/2519</class-ref>, <class-ref scheme="cpc">H04B10/2525</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/25137" definition-exists="false" ipc-concordant="H04B10/2513" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25137</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using pulse shaping at the transmitter, e.g. pre-chirping or dispersion supported transmission [DST]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2519" definition-exists="true" ipc-concordant="H04B10/2519" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/2519</classification-symbol><class-title date-revised="2020-05-01"><title-part><text>using Bragg gratings</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2525" definition-exists="true" ipc-concordant="H04B10/2525" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/2525</classification-symbol><class-title date-revised="2020-05-01"><title-part><text>using dispersion-compensating fibres</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/25253" definition-exists="true" ipc-concordant="H04B10/2525" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/25253</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>with dispersion management, i.e. using a combination of different kind of fibres in the transmission system</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2531" definition-exists="true" ipc-concordant="H04B10/2531" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2531</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using spectral inversion</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/2537" definition-exists="true" ipc-concordant="H04B10/2537" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2537</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>due to scattering processes, e.g. Raman or Brillouin scattering</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/2543" definition-exists="true" ipc-concordant="H04B10/2543" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/2543</classification-symbol><class-title date-revised="2020-05-01"><title-part><text>due to fibre non-linearities, e.g. Kerr effect</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/255" definition-exists="true" ipc-concordant="H04B10/255" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/255</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Self-phase modulation [SPM]</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2557" definition-exists="true" ipc-concordant="H04B10/2557" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2557</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cross-phase modulation [XPM]</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2563" definition-exists="true" ipc-concordant="H04B10/2563" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2563</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Four-wave mixing [FWM]</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/2569" definition-exists="true" ipc-concordant="H04B10/2569" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2569</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>due to polarisation mode dispersion [PMD]</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/2572" definition-exists="false" ipc-concordant="H04B10/2507" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2572</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>due to forms of polarisation-dependent distortion other than PMD</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/2575" definition-exists="true" ipc-concordant="H04B10/2575" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B10/2575</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/25751" definition-exists="true" ipc-concordant="H04B10/2575" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25751</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Optical arrangements for CATV or video distribution </text><reference><text>adaptations of television systems for optical transmission <class-ref scheme="cpc">H04N7/22</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/25752" definition-exists="false" ipc-concordant="H04B10/2575" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25752</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Optical arrangements for wireless networks</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/25753" definition-exists="true" ipc-concordant="H04B10/2575" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/25753</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Distribution optical network, e.g. between a base station and a plurality of remote units</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/25754" definition-exists="false" ipc-concordant="H04B10/2575" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25754</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Star network topology</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/25755" definition-exists="false" ipc-concordant="H04B10/2575" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25755</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Ring network topology</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/25756" definition-exists="false" ipc-concordant="H04B10/2575" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25756</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bus network topology</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/25758" definition-exists="false" ipc-concordant="H04B10/2575" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25758</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>between a central unit and a single remote unit by means of an optical fibre</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/25759" definition-exists="false" ipc-concordant="H04B10/2575" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/25759</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details of the reception of RF signal or the optical conversion before the optical fibre</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/2581" definition-exists="true" ipc-concordant="H04B10/2581" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B10/2581</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Multimode transmission</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/2587" definition-exists="true" ipc-concordant="H04B10/2587" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2587</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a single light source for multiple stations</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/2589" definition-exists="false" ipc-concordant="H04B10/25" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/2589</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Bidirectional transmission</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/25891" definition-exists="false" ipc-concordant="H04B10/25" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/25891</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Transmission components </text><reference><text><class-ref scheme="cpc">H04B10/40</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/27" definition-exists="true" ipc-concordant="H04B10/27" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B10/27</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Arrangements for networking</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/271" definition-exists="false" ipc-concordant="H04B10/27" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/271</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Combination of different networks, e.g. star and ring configuration in the same network or two ring networks interconnected</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/272" definition-exists="true" ipc-concordant="H04B10/272" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/272</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Star-type networks </text><CPC-specific-text><text>or tree-type networks</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/2725" definition-exists="false" ipc-concordant="H04B10/272" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2725</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Star-type networks without a headend</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/275" definition-exists="true" ipc-concordant="H04B10/275" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/275</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Ring-type networks</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/2755" definition-exists="false" ipc-concordant="H04B10/275" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2755</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Ring-type networks with a headend</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/278" definition-exists="true" ipc-concordant="H04B10/278" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/278</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bus-type networks</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/29" definition-exists="true" ipc-concordant="H04B10/29" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/29</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Repeaters</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/291" definition-exists="true" ipc-concordant="H04B10/291" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/291</classification-symbol><class-title date-revised="2020-05-01"><title-part><text>in which processing or amplification is carried out without conversion of the main signal from optical form</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/2912" definition-exists="false" ipc-concordant="H04B10/291" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2912</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the medium used for amplification or processing</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2914" definition-exists="true" ipc-concordant="H04B10/291" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/2914</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>using lumped semiconductor optical amplifiers [SOA]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2916" definition-exists="true" ipc-concordant="H04B10/291" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/2916</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>using Raman or Brillouin amplifiers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/293" definition-exists="true" ipc-concordant="H04B10/293" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/293</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Signal power control</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2931" definition-exists="false" ipc-concordant="H04B10/293" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2931</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using AGC </text><reference><text><class-ref scheme="cpc">H04B10/294</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2933" definition-exists="false" ipc-concordant="H04B10/293" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2933</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>considering the whole optical path</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/2935" definition-exists="false" ipc-concordant="H04B10/293" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2935</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a cascade of amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/2937" definition-exists="false" ipc-concordant="H04B10/293" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2937</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Systems with a repeater placed only at the beginning or the end of the system, i.e. repeaterless systems, e.g. systems with only post and pre-amplification</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/2939" definition-exists="false" ipc-concordant="H04B10/293" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2939</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Network aspects</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/294" definition-exists="true" ipc-concordant="H04B10/294" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/294</classification-symbol><class-title date-revised="2020-05-01"><title-part><text>in a multiwavelength system, e.g. gain equalisation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/2941" definition-exists="false" ipc-concordant="H04B10/294" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2941</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an equalising unit, e.g. a filter </text><reference><text><class-ref scheme="cpc">H04B10/296</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/2942" definition-exists="false" ipc-concordant="H04B10/294" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2942</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using automatic gain control [AGC] </text><reference><text><class-ref scheme="cpc">H04B10/296</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/296" definition-exists="true" ipc-concordant="H04B10/296" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/296</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transient power control, e.g. due to channel add/drop or rapid fluctuations in the input power</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/297" definition-exists="true" ipc-concordant="H04B10/297" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/297</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bidirectional amplification</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2971" definition-exists="false" ipc-concordant="H04B10/297" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2971</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>A single amplifier for both directions</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/2972" definition-exists="false" ipc-concordant="H04B10/297" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/2972</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Each direction being amplified separately</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/298" definition-exists="false" ipc-concordant="H04B10/291" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/298</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Two-way repeaters, i.e. repeaters amplifying separate upward and downward lines</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/299" definition-exists="true" ipc-concordant="H04B10/299" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/299</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Signal waveform processing, e.g. reshaping or retiming</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/40" definition-exists="true" ipc-concordant="H04B10/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transceivers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/43" definition-exists="true" ipc-concordant="H04B10/43" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/43</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a single component as both light source and receiver, e.g. using a photoemitter as a photoreceiver</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/50" definition-exists="true" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transmitters</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/501" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/501</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Structural aspects</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/502" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/502</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>LED transmitters</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/503" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/503</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Laser transmitters</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/504" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/504</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using direct modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/505" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/505</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using external modulation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/5051" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5051</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a series, i.e. cascade, combination of modulators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/5053" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5053</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a parallel, i.e. shunt, combination of modulators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/5055" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5055</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a pre-coder</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/5057" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a feedback signal generated by analysing the optical output</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B10/50572" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/50572</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>to control the modulating signal amplitude including amplitude distortion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B10/50575" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/50575</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>to control the modulator DC bias</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B10/50577" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/50577</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>to control the phase of the modulating signal</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/5059" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5059</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a feed-forward signal generated by analysing the optical or electrical input</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B10/50593" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/50593</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>to control the modulating signal amplitude including amplitude distortion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B10/50595" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/50595</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>to control the modulator DC bias</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B10/50597" definition-exists="false" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/50597</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>to control the phase of the modulating signal</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/506" definition-exists="true" ipc-concordant="H04B10/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/506</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Multiwavelength transmitters</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/508" definition-exists="true" ipc-concordant="H04B10/508" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/508</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pulse generation, e.g. generation of solitons</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/516" definition-exists="true" ipc-concordant="H04B10/516" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/516</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details of coding or modulation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/5161" definition-exists="false" ipc-concordant="H04B10/516" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5161</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Combination of different modulation schemes</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/5162" definition-exists="false" ipc-concordant="H04B10/516" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5162</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Return-to-zero modulation schemes</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/5165" definition-exists="false" ipc-concordant="H04B10/516" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Carrier suppressed; Single sideband; Double sideband or vestigial</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/5167" definition-exists="false" ipc-concordant="H04B10/516" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5167</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Duo-binary; Alternative mark inversion; Phase shaped binary transmission</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/524" definition-exists="true" ipc-concordant="H04B10/524" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/524</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pulse modulation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/532" definition-exists="true" ipc-concordant="H04B10/532" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B10/532</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Polarisation modulation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/54" definition-exists="true" ipc-concordant="H04B10/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/54</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Intensity modulation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/541" definition-exists="false" ipc-concordant="H04B10/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/541</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Digital intensity or amplitude modulation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/548" definition-exists="true" ipc-concordant="H04B10/548" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/548</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Phase or frequency modulation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/556" definition-exists="true" ipc-concordant="H04B10/556" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/556</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/5561" definition-exists="false" ipc-concordant="H04B10/556" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5561</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Digital phase modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/5563" definition-exists="false" ipc-concordant="H04B10/556" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/5563</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Digital frequency modulation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/564" definition-exists="true" ipc-concordant="H04B10/564" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/564</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Power control</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/572" definition-exists="true" ipc-concordant="H04B10/572" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/572</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Wavelength control</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/58" definition-exists="true" ipc-concordant="H04B10/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/58</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Compensation for non-linear transmitter output</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/588" definition-exists="true" ipc-concordant="H04B10/588" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/588</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in external modulation systems</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/60" definition-exists="true" ipc-concordant="H04B10/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/60</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Receivers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/61" definition-exists="true" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B10/61</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Coherent receivers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/612" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/612</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for optical signals modulated with a format different from binary or higher-order PSK [X-PSK], e.g. QAM, DPSK, FSK, MSK, ASK</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/613" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/613</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>including phase diversity, e.g., having in-phase and quadrature branches, as in QPSK coherent receivers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/614" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/614</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers </text><reference><text><class-ref scheme="cpc">H04J14/06</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/615" definition-exists="true" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/615</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Arrangements affecting the optical part of the receiver</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/6151" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6151</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a polarization controller at the receiver&apos;s input stage</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/616" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/616</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details of the electronic signal processing in coherent optical receivers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/6161" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6161</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Compensation of chromatic dispersion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/6162" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6162</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Compensation of polarization related effects, e.g., PMD, PDL</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/6163" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6163</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Compensation of non-linear effects in the fiber optic link, e.g. self-phase modulation [SPM], cross-phase modulation [XPM], four wave mixing [FWM]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/6164" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6164</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Estimation or correction of the frequency offset between the received optical signal and the optical local oscillator</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/6165" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Estimation of the phase of the received optical signal, phase error estimation or phase error correction</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/6166" definition-exists="true" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/6166</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Polarisation demultiplexing, tracking or alignment of orthogonal polarisation components</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/63" definition-exists="true" ipc-concordant="H04B10/63" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/63</classification-symbol><class-title date-revised="2020-05-01"><title-part><text>Homodyne </text><CPC-specific-text><text>, i.e. coherent receivers where the local oscillator is locked in frequency and phase to the carrier signal</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/64" definition-exists="true" ipc-concordant="H04B10/64" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/64</classification-symbol><class-title date-revised="2020-05-01"><title-part><text>Heterodyne </text><CPC-specific-text><text>, i.e. coherent receivers where, after the opto-electronic conversion, an electrical signal at an intermediate frequency [fIF] is obtained</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/65" definition-exists="false" ipc-concordant="H04B10/61" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/65</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Intradyne, i.e. coherent receivers with a free running local oscillator having a frequency close but not phase-locked to the carrier signal</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/66" definition-exists="true" ipc-concordant="H04B10/66" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/66</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Non-coherent receivers, e.g. using direct detection</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/67" definition-exists="true" ipc-concordant="H04B10/67" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/67</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Optical arrangements in the receiver</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/671" definition-exists="false" ipc-concordant="H04B10/67" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/671</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for controlling the input optical signal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/672" definition-exists="false" ipc-concordant="H04B10/67" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/672</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for controlling the power of the input optical signal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B10/673" definition-exists="false" ipc-concordant="H04B10/67" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/673</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an optical preamplifier</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H04B10/674" definition-exists="false" ipc-concordant="H04B10/67" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/674</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a variable optical attenuator</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/675" definition-exists="false" ipc-concordant="H04B10/67" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/675</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for controlling the optical bandwidth of the input signal, e.g. spectral filtering</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/676" definition-exists="false" ipc-concordant="H04B10/67" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/676</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for all-optical demodulation of the input optical signal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/677" definition-exists="false" ipc-concordant="H04B10/67" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/677</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for differentially modulated signal, e.g. DPSK signals</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/69" definition-exists="true" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/69</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Electrical arrangements in the receiver</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/691" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/691</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for optimizing the photodetector in the receiver</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/6911" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6911</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Photodiode bias control, e.g. for compensating temperature variations</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/693" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/693</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for optimizing the preamplifier in the receiver</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/6931" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6931</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Automatic gain control of the preamplifier</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/6932" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6932</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bandwidth control of bit rate adaptation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/6933" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6933</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Offset control of the differential preamplifier</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/695" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/695</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for optimizing the decision element in the receiver, e.g. by using automatic threshold control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B10/697" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/697</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for reducing noise and distortion</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/6971" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6971</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using equalisation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/6972" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6972</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using passive filtering</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H04B10/6973" definition-exists="false" ipc-concordant="H04B10/69" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/6973</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using noise matching networks</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/70" definition-exists="true" ipc-concordant="H04B10/70" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H04B10/70</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Photonic quantum communication</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/80" definition-exists="true" ipc-concordant="H04B10/80" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/80</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups <class-ref scheme="cpc">H04B10/03</class-ref> - <class-ref scheme="cpc">H04B10/70</class-ref>, e.g. optical power feeding or optical transmission through water</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/801" definition-exists="false" ipc-concordant="H04B10/80" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/801</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using optical interconnects, e.g. light coupled isolators, circuit board interconnections</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/802" definition-exists="false" ipc-concordant="H04B10/80" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/802</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for isolation, e.g. using optocouplers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/803" definition-exists="false" ipc-concordant="H04B10/80" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/803</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Free space interconnects, e.g. between circuit boards or chips</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/806" definition-exists="false" ipc-concordant="H04B10/80" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/806</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for feeding power</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/807" definition-exists="false" ipc-concordant="H04B10/80" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/807</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Optical power feeding, i.e. transmitting power using an optical signal</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B10/808" definition-exists="true" ipc-concordant="H04B10/80" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H04B10/808</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Electrical power feeding of an optical transmission system</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B10/85" definition-exists="true" ipc-concordant="H04B10/85" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B10/85</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Protection from unauthorised access, e.g. eavesdrop protection</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B10/90" definition-exists="true" ipc-concordant="H04B10/90" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H04B10/90</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Non-optical transmission systems, e.g. transmission systems employing non-photonic corpuscular radiation</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B11/00" definition-exists="true" ipc-concordant="H04B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B11/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transmission systems employing sonic, ultrasonic or infrasonic waves</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B13/00" definition-exists="true" ipc-concordant="H04B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H04B13/00</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Transmission systems characterised by the medium used for transmission, not provided for in groups <class-ref scheme="cpc">H04B3/00</class-ref>&#160;-&#160;<class-ref scheme="cpc">H04B11/00</class-ref></text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B13/005" definition-exists="true" ipc-concordant="H04B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B13/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transmission systems in which the medium consists of the human body</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B13/02" definition-exists="true" ipc-concordant="H04B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B13/02</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B14/00" definition-exists="true" ipc-concordant="H04B14/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transmission systems not characterised by the medium used for transmission </text><reference><text>details thereof <class-ref scheme="cpc">H04B1/00</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B14/002" definition-exists="false" ipc-concordant="H04B14/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the use of a carrier modulation </text><reference><text>using subcarrier modulation <class-ref scheme="cpc">H04B14/08</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B14/004" definition-exists="false" ipc-concordant="H04B14/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Amplitude modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B14/006" definition-exists="false" ipc-concordant="H04B14/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Angle modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B14/008" definition-exists="false" ipc-concordant="H04B14/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Polarisation modulation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B14/02" definition-exists="true" ipc-concordant="H04B14/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B14/02</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>characterised by the use of pulse modulation </text><reference><text>in radio transmission relays <class-ref scheme="cpc">H04B7/17</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B14/023" definition-exists="false" ipc-concordant="H04B14/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using pulse amplitude modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B14/026" definition-exists="false" ipc-concordant="H04B14/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using pulse time characteristics modulation, e.g. width, position, interval</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B14/04" definition-exists="true" ipc-concordant="H04B14/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B14/04</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>using pulse code modulation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B14/042" definition-exists="false" ipc-concordant="H04B14/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Special circuits, e.g. comparators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B14/044" definition-exists="false" ipc-concordant="H04B14/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/044</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sample and hold circuits </text><reference><text>in general <class-ref scheme="cpc">G11C27/02</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B14/046" definition-exists="false" ipc-concordant="H04B14/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Systems or methods for reducing noise or bandwidth</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B14/048" definition-exists="false" ipc-concordant="H04B14/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/048</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non linear compression or expansion</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B14/06" definition-exists="true" ipc-concordant="H04B14/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B14/06</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>using differential modulation, e.g. delta modulation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B14/062" definition-exists="false" ipc-concordant="H04B14/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/062</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using delta modulation or one-bit differential modulation [1DPCM]</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B14/064" definition-exists="false" ipc-concordant="H04B14/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/064</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with adaptive feedback</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B14/066" definition-exists="false" ipc-concordant="H04B14/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using differential modulation with several bits [NDPCM]</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B14/068" definition-exists="false" ipc-concordant="H04B14/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with adaptive feedback</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B14/08" definition-exists="false" ipc-concordant="H04B14/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B14/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>characterised by the use of a sub-carrier</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B15/00" definition-exists="true" ipc-concordant="H04B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B15/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Suppression or limitation of noise or interference </text><reference><text>by means associated with receiver <class-ref scheme="cpc">H04B1/10</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B15/005" definition-exists="false" ipc-concordant="H04B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H04B15/005</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>Reducing noise, e.g. humm, from the supply</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B15/02" definition-exists="true" ipc-concordant="H04B15/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B15/02</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>Reducing interference from electric apparatus by means located at or near the interfering apparatus</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B15/025" definition-exists="true" ipc-concordant="H04B15/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B15/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reducing interference from ignition apparatus of fuel engines </text><reference><text>cables with high resistance <class-ref scheme="cpc">H01B</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B15/04" definition-exists="true" ipc-concordant="H04B15/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H04B15/04</classification-symbol><class-title date-revised="2020-08-01"><title-part><text>the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B15/06" definition-exists="false" ipc-concordant="H04B15/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B15/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by local oscillators of receivers</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H04B17/00" definition-exists="true" ipc-concordant="H04B17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Monitoring</text></title-part><title-part><text>Testing </text><reference><text>of line transmission systems <class-ref scheme="cpc">H04B3/46</class-ref>; arrangements for monitoring or testing transmission systems employing electromagnetic waves other than radio waves <class-ref scheme="cpc">H04B10/07</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B17/0082" definition-exists="false" ipc-concordant="H04B17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/0082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using service channels; using auxiliary channels</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/0085" definition-exists="false" ipc-concordant="H04B17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B17/0085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using test signal generators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/0087" definition-exists="false" ipc-concordant="H04B17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B17/0087</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using auxiliary channels or channel simulators</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B17/10" definition-exists="false" ipc-concordant="H04B17/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of transmitters</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/101" definition-exists="false" ipc-concordant="H04B17/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/101</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for measurement of parameters</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/102" definition-exists="false" ipc-concordant="H04B17/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/102</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of radiated power at antenna port</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/103" definition-exists="false" ipc-concordant="H04B17/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/103</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of reflected power, e.g. return loss</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/104" definition-exists="false" ipc-concordant="H04B17/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/104</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of other parameters, e.g. DC offset, delay or propagation times</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/11" definition-exists="false" ipc-concordant="H04B17/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for calibration</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/12" definition-exists="false" ipc-concordant="H04B17/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of transmit antennas, e.g. of the amplitude or phase</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/13" definition-exists="false" ipc-concordant="H04B17/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/13</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of power amplifiers, e.g. gain or non-linearity</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/14" definition-exists="false" ipc-concordant="H04B17/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of the whole transmission and reception path, e.g. self-test loop-back</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/15" definition-exists="false" ipc-concordant="H04B17/15" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/15</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Performance testing</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/16" definition-exists="false" ipc-concordant="H04B17/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Test equipment located at the transmitter</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/17" definition-exists="true" ipc-concordant="H04B17/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/17</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Detection of non-compliance or faulty performance, e.g. response deviations </text><reference><text><class-ref scheme="cpc">H04B17/18</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/18" definition-exists="true" ipc-concordant="H04B17/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Monitoring during normal operation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/19" definition-exists="false" ipc-concordant="H04B17/19" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/19</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Self-testing arrangements</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B17/20" definition-exists="false" ipc-concordant="H04B17/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of receivers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/21" definition-exists="false" ipc-concordant="H04B17/21" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/21</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for calibration</text></title-part><title-part><text>for correcting measurements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/23" definition-exists="false" ipc-concordant="H04B17/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/23</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indication means, e.g. displays, alarms, audible means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/24" definition-exists="false" ipc-concordant="H04B17/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with feedback of measurements to the transmitter</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/26" definition-exists="false" ipc-concordant="H04B17/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using historical data, averaging values or statistics</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/27" definition-exists="true" ipc-concordant="H04B17/27" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/27</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for locating or positioning the transmitter</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/29" definition-exists="false" ipc-concordant="H04B17/29" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/29</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Performance testing</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B17/30" definition-exists="false" ipc-concordant="H04B17/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/30</classification-symbol><class-title><title-part><text>of propagation channels</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/309" definition-exists="true" ipc-concordant="H04B17/309" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/309</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Measuring or estimating channel quality parameters</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/318" definition-exists="false" ipc-concordant="H04B17/318" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/318</classification-symbol><class-title><title-part><text>Received signal strength</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B17/327" definition-exists="false" ipc-concordant="H04B17/327" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/327</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Received signal code power [RSCP]</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/336" definition-exists="false" ipc-concordant="H04B17/336" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/336</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/345" definition-exists="false" ipc-concordant="H04B17/345" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/345</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Interference values </text><reference><text><class-ref scheme="cpc">H04B17/336</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/354" definition-exists="false" ipc-concordant="H04B17/354" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/354</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adjacent channel leakage power</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/364" definition-exists="false" ipc-concordant="H04B17/364" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/364</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Delay profiles</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/373" definition-exists="true" ipc-concordant="H04B17/373" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/373</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Predicting channel quality parameters</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/382" definition-exists="true" ipc-concordant="H04B17/382" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/382</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for resource allocation, admission control or handover</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/391" definition-exists="true" ipc-concordant="H04B17/391" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/391</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modelling the propagation channel</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/3911" definition-exists="false" ipc-concordant="H04B17/391" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/3911</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fading models or fading generators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/3912" definition-exists="false" ipc-concordant="H04B17/391" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/3912</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Simulation models</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/3913" definition-exists="false" ipc-concordant="H04B17/391" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/3913</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Predictive models</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H04B17/40" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of relay systems</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/401" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/401</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with selective localization</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/402" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/402</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using different frequencies</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B17/403" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/403</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>generated by local oscillators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B17/404" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/404</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>selected by local filters</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H04B17/405" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/405</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>generated by local multipliers, dividers, modulators</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/406" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/406</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using coded addresses</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H04B17/407" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/407</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>without selective localization</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/408" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/408</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using successive loop-backs</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H04B17/409" definition-exists="false" ipc-concordant="H04B17/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-01-15" status="published"><classification-symbol>H04B17/409</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of resistance, voltage or current measurement</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="true" level="6" additional-only="true" sort-key="H04B201/00" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/00</classification-symbol>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H04B201/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H04B2201/00</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Indexing scheme relating to details of transmission systems not covered by a single group of <class-ref scheme="cpc">H04B3/00</class-ref>&#160;-&#160;<class-ref scheme="cpc">H04B13/00</class-ref></text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B201/69" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/69</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Orthogonal indexing scheme relating to spread spectrum techniques in general</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B201/692" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/692</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cognitive radio</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B201/694" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/694</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>WPAN</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B201/696" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/696</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>relating to Dowlink</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B201/698" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/698</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>relating to Uplink</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B201/707" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/707</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>relating to direct sequence modulation</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70701" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70701</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>featuring pilot assisted reception</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70702" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70702</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Intercell-related aspects</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70703" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70703</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using multiple or variable rates</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70705" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70705</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Rate detection</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70706" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70706</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with means for reducing the peak-to-average power ratio</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70707" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70707</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Efficiency-related aspects</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70709" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70709</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with discontinuous detection</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/7071" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/7071</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with dynamic control of receiver resources</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="12" additional-only="true" sort-key="H04B201/70711" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70711</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with modular structure</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70713" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70713</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing computational requirements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70714" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70714</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing hardware requirements</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70715" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70715</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with application-specific features</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70716" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70716</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Quadrature</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70718" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70718</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Particular systems or standards</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70719" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70719</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>CDMA2000</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/7072" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/7072</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>HDR</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70722" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70722</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>HSDPA/HSUPA</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="12" additional-only="true" sort-key="H04B201/70723" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70723</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multi-carrier HSPA</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70724" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70724</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>UMTS</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70726" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70726</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Asynchronous CDMA</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70727" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70727</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using fast Fourier transform</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/70728" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70728</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Frequency aspects</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/7073" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/7073</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Direct sequence modulation synchronisation</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70733" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70733</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>2D search</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70736" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70736</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>DSA</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/7097" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/7097</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Direct sequence modulation interference</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/709709" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/709709</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Methods of preventing interference</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/709718" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/709718</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Determine interference</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/709727" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/709727</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>GRAKE type RAKE receivers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/709736" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/709736</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hybrid interference mitigation schemes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/709745" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/709745</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Iterative interference mitigation schemes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/709754" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/709754</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Blind joint detection</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/709763" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/709763</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Joint detection using feedback</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/709772" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/709772</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Joint detection using feedforward</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/709781" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/709781</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Linear detectors for joint detection</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B201/70979" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/70979</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Fat finger issues in RAKE receivers</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B201/713" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/713</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Frequency hopping</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71307" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71307</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Partial band interference</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71315" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71315</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Wide band interference</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71323" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71323</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adaptive systems</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/7133" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/7133</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Asymmetric systems</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71338" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71338</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Asynchronous systems</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71346" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71346</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bluetooth</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71353" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71353</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Fast frequency hopping</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71361" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71361</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Slow frequency hopping</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71369" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71369</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>OFCHM</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71376" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71376</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Threshold</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71384" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71384</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Look-up tables</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B201/7163" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/7163</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Orthogonal indexing scheme relating to impulse radio</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71632" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71632</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Diversity</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71634" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71634</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Applied to ranging</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71636" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71636</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transmitted reference</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B201/71638" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2201/71638</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Spectrum issues</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H04B203/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to line transmission systems</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B203/54" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-05-01" status="published"><classification-symbol>H04B2203/54</classification-symbol><class-title date-revised="2019-05-01"><title-part><text>Aspects of powerline communications not already covered by <class-ref scheme="cpc">H04B3/54</class-ref> and its subgroups</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B203/5404" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5404</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Methods of transmitting or receiving signals via power distribution lines</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5408" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5408</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using protocols</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5412" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5412</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by modofying wave form of the power source</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5416" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5416</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by adding signals to the wave form of the power source</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/542" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/542</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using zero crossing information</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5425" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5425</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>improving S/N by matching impedance, noise reduction, gain control</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B203/5429" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5429</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Applications for powerline communications</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5433" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5433</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Remote metering</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5437" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5437</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Wired telephone</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5441" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5441</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Wireless systems or telephone</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5445" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5445</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Local network</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/545" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/545</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Audio/video application, e.g. interphone</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5454" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5454</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adapter and plugs</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5458" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5458</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Monitor sensor</text></title-part><title-part><text>Alarm systems</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B203/5462" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5462</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Systems for power line communications</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5466" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5466</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using three phases conductors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/547" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/547</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>via DC power distribution</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5475" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5475</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>adapted for drill or well combined with data transmission</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5479" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5479</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using repeaters</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5483" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5483</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using coupling circuits</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H04B203/5487" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5487</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>cables</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5491" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5491</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using filtering and bypassing</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H04B203/5495" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2203/5495</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having measurements and testing channel</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H04B210/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to optical transmission systems</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B210/003" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Devices including multiple stages, e.g., multi-stage optical amplifiers or dispersion compensators</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B210/006" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Devices for generating or processing an RF signal by optical means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B210/07" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Monitoring an optical transmission system using a supervisory signal </text><reference><text>OAM for WDM transmission <class-ref scheme="cpc">H04J14/0272</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/071" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/071</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using alarms</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/072" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/072</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using an overhead signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/074" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/074</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a superposed, over-modulated signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/075" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/075</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a pilot tone</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/077" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/077</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a separate fibre</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/078" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/078</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a separate wavelength</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B210/08" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Shut-down or eye-safety</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B210/25" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/25</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Distortion or dispersion compensation</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/252" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/252</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>after the transmission line, i.e. post-compensation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/254" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/254</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>before the transmission line, i.e. pre-compensation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/256" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/256</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>at the repeater, i.e. repeater compensation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B210/258" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/258</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>treating each wavelength or wavelength band separately</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B210/516" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/516</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Optical conversion of optical modulation formats, e.g., from optical ASK to optical PSK</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B210/517" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2210/517</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Optical NRZ to RZ conversion, or <u>vice versa</u></text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H04B215/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing interference at the transmission system level</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B215/061" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/061</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of burst noise, e.g. in TDMA systems</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B215/062" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/062</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by inhibiting burst transmission</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B215/063" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/063</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by smoothing the transmission power envelope</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B215/064" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/064</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of clock or synthesizer reference frequency harmonics</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B215/065" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/065</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by changing the frequency of clock or reference frequency</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B215/066" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/066</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by stopping a clock generator</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B215/067" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/067</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by modulation dispersion</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H04B215/068" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/068</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by avoiding a reception frequency range</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H04B215/069" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H04B2215/069</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of switch mode power supply ripple</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></class-scheme>