连续相位调制信号相干解调技术

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1、中国科学技术大学硕士毕业论文AbS仃actAbstractContinuousPhaseModulation(CPM)isaclassofnonlinearmodulationschemew“hmemory，whichisbandwidth—andpowe卜e币cient．Theyarepanicularlyappealinginradioandwirelesscommunications．IndespiteofthoseexceIlentcharacteristics，CPMareessentiallynonlinearandwithmemo阱Itleadstodi伍cultieso

2、fhi曲compleXreceiVerandsynchronizationinCPMsignal’sapplications．Generally，CPMsignal’sdemodulationusetheVeD，complexMaximum—Likelihood—Sequence—Detection(MLSD)algorithm．SotheresearchofsimpleandpracticabledemodulationalgorithmsissignificantforC聊Ⅵsignal’sapplication．Thispaperconcentratesontheresearch

3、ofCPM’scoherentdemodulationalgorithms，andquasi-coherentdemodulationalgorithmsinmesituationswhenwitherrorsincarrierrecove呵andtimingestimation．Themainworkisasfollow：FirstlyintroducedCPM’spresentationmethods，especiallytheLaurentDecompositionmethod，whichmeansCPMsignalcanbepresentedbythelinearcombina

4、tionofasetofPulseAmplitudeModulation(PAM)signals．ThenaRertheintroductionofCPM’sMLSDalgorithmanditsimplementationbyViterbiDecoder，basedonLaurentDecomposition，thispaperproposedCPM’soptimumandsuboptimumcoherentdemodulators，whichreducedthecompIexityofCPM’sreceiVercomparedtoMLSDreceiVerwhilewithoutgr

5、eatlossinthebit_emrperfomance．Forthesituationofwithe11rorsincarrierrecoveryandtimingestimation，aquasi-coherentdemodulatorwasproposed．ThisdemodulatorjointedViterbiDecoderandsynchronizationparameterestimatorinthewayofDecision—Directed(DD)，andcarriedoutbina巧CPM’ssynchronizationanddemodulationsimult

6、aneously．Thispaperusedtheproposeddemodulatorto6nishthedemodulationoftheinterceptedsignalswhichwasguessedtobeCPMsignals．TheCPMsignalswerereconstructedandcomparedwiththeinterceptedsignals．Thedemodulationresultswereconcludedtobereasonable疗omdifferentways．Lastly，aclassofCPMsignalsw“hseparabIephase，f

7、orexampleLRECIII123中国科学技术大学硕士毕业论文Abs仃actwithrectangularpulseresponse，wasconsidered．BasedontheequiValentprincipleandLaurentDecomposition，asimpli6edcoherentdemodulatorwasproposed．ComparedtotheLaurentDecompositionbaseddemodulat