深空通信gmsk调制体制应用分析和分析

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1、硕L学位论文AbstractDeep—spacecommunicationhasthecharacteristicsoflongcommunicationdistance，bigtransmissiondelay，andcomplexcommunicationenvironment。anditscommunicationchanneliSatypicalband—limitedandnon—linearchannel．Withtheincreasingtrafficandthescarcityofspectrumresources，allofthispromotethe

2、researchanddevelopmentofhigh—bandwidthefficiencyandpower—efficientmodulationtechnology．GMSKmodulationhasthecharacteristicsofconstantenvelope，continuousphase，fastspectrumdecayandthenarrowfrequencybandofmodulatedwaveandSOon．Ontheotherhand，GMSKhasahighbandwidthandpowerutilization，anditcanef

3、fectivelyreduceadjacentchannelinterference，improvetheefficiencyofnon·linearpoweramplifier，itissuitablefordeep—spacecommunicationverymuchduetothesecharacteristics．Inthispaper，wemainlystudyGMSKcontinuousphasemodulationtechniqueadapttodeep—spacecommunications．Atfirst，deep．spacecommunication

4、channelcharacteristicsandcommunicationlinkhavebeenstudied，andthepaperslimsupthedeep—spacecommunicationwiththecharacteristicsofthelongcommunicationdistance，thebigsignalpropagationdelay，thelowreceiversignaltonoiseratio，introducetheconceptoftheGMSKsignal，staterepresentation，thephasecharacte

5、ristics，thegridstatediagramaswellasthemodulatorimplementation．Then，thispaperfocusesontheresearchofcoherentdemodulationalgorithmofGMSKsignal，andanalysisthecomplexityoftheViterbialgorithminchartformonthebasisofintroducingmaximumlikelihoodsequentialdetectionprincipledetailedly．Studiesshowth

6、atthecomplexityoftheViterbialgorithmrelatewiththecorrelationlengthLoftheGMSKsignalmodulation．Therefore，accordingtothecharacteristicsoflargercalculationandthehighcomplexityoftheMLSDalgorithm，thedemodulationalgorithmoftheLaurentoptimaldetectionandLaurentsub．optimaldetectionoftheGMSKsignals

7、beengotbyintroducingLaurentalgorithmandtheMalgorithm，underthepremiseofconsideringthecomplexityanddemodulationperformance，LaurentoptimaldetectioncombiningwiththeMalgorithmoftheGMSKsignalisdescribedinthispaper，theproposednewjointalgorithmmakeMalgorithmtakingtheplaceofViterb