| dbo:abstract |
Unter der Synchrondemodulation, oder auch kohärente Demodulation genannt, versteht man in der Nachrichtentechnik eine spezielle Form eines Amplituden-Demodulators. Dabei wird die Phasenlage der nicht gesendeten Trägerfrequenz im Empfänger rekonstruiert. Die Funktionseinheit, welche diesen Vorgang in einem Empfangsgerät ausführt, wird Synchrondemodulator genannt. (de) A carrier recovery system is a circuit used to estimate and compensate for frequency and phase differences between a received signal's carrier wave and the receiver's local oscillator for the purpose of coherent demodulation. In the transmitter of a communications carrier system, a carrier wave is modulated by a baseband signal. At the receiver, the baseband information is extracted from the incoming modulated waveform. In an ideal communications system, the carrier signal oscillators of the transmitter and receiver would be perfectly matched in frequency and phase, thereby permitting perfect coherent demodulation of the modulated baseband signal. However, transmitters and receivers rarely share the same carrier oscillator. Communications receiver systems are usually independent of transmitting systems and contain their oscillators with frequency and phase offsets and instabilities. Doppler shift may also contribute to frequency differences in mobile radio frequency communications systems. All these frequencies and phase variations must be estimated using the information in the received signal to reproduce or recover the carrier signal at the receiver and permit coherent demodulation. (en) |
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wiki-commons:Special:FilePath/QPSK_Phase_Error.svg?width=300 |
| dbo:wikiPageExternalLink |
http://rfdesign.com/images/archive/0102Feigin20.pdf http://hdl.handle.net/10919/35869 https://archive.org/details/communicationsha00gibs_234 https://archive.org/details/communicationsha00gibs_234/page/n259 https://archive.org/details/digitalcommunica00barr https://archive.org/details/digitalcommunica00barr/page/n733 https://archive.org/details/synchronizationd00breg https://archive.org/details/synchronizationd00breg/page/n34 https://archive.org/details/wjtechnotesv11n2/mode/2up https://archive.org/details/wjtechnotesv11n2/page/8/mode/2up https://web.archive.org/web/20120211194804/http:/rfdesign.com/images/archive/0102Feigin20.pdf%23 |
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dbc:Multiplexing dbc:Electronic_oscillators dbc:Communication_circuits |
| gold:hypernym |
dbr:Circuit |
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| rdfs:comment |
Unter der Synchrondemodulation, oder auch kohärente Demodulation genannt, versteht man in der Nachrichtentechnik eine spezielle Form eines Amplituden-Demodulators. Dabei wird die Phasenlage der nicht gesendeten Trägerfrequenz im Empfänger rekonstruiert. Die Funktionseinheit, welche diesen Vorgang in einem Empfangsgerät ausführt, wird Synchrondemodulator genannt. (de) A carrier recovery system is a circuit used to estimate and compensate for frequency and phase differences between a received signal's carrier wave and the receiver's local oscillator for the purpose of coherent demodulation. In the transmitter of a communications carrier system, a carrier wave is modulated by a baseband signal. At the receiver, the baseband information is extracted from the incoming modulated waveform. (en) |
| rdfs:label |
Synchrondemodulation (de) Carrier recovery (en) |
| owl:sameAs |
freebase:Carrier recovery yago-res:Carrier recovery wikidata:Carrier recovery dbpedia-de:Carrier recovery https://global.dbpedia.org/id/2FH6R |
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wikipedia-en:Carrier_recovery?oldid=1095832537&ns=0 |
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wiki-commons:Special:FilePath/QPSK_Phase_Error.svg wiki-commons:Special:FilePath/QPSK_Freq_Error.svg |
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wikipedia-en:Carrier_recovery |
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dbr:Carrier |
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dbr:Phase_recovery dbr:Coherent_demodulation dbr:Coherent_detection dbr:Coherent_detector dbr:Timing_recovery |
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dbr:Single-sideband_modulation dbr:Clock_recovery dbr:Demodulation dbr:John_P._Costas_(engineer) dbr:Phase-locked_loop dbr:Phase_detector dbr:Carrier dbr:Digital_down_converter dbr:Costas_loop dbr:Differential_coding dbr:Carrier_wave dbr:Reduced-carrier_transmission dbr:Phase_recovery dbr:Coherent_demodulation dbr:Coherent_detection dbr:Coherent_detector dbr:Timing_recovery |
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wikipedia-en:Carrier_recovery |
