1、中南大學碩士學位論文MSK數(shù)字化調制解調技術研究姓名：胡敏申請學位級別：碩士專業(yè)：通信與信息系統(tǒng)指導教師：肖大光20070401ABSTRACTSoftwareradioiSanimportantresearchfieldanddevelopmentinthemodemcommanicationtechnologyNowthelimitationondevelopmentofsoftwareradioiSthecontradiction

2、betweentheperformanceofhardwareandtheenormouscalculationinthesignalprocessingSofurtherresearchingthetheoryandputtingforwardthenewmethodsandthesignalprocessingalgorithmwiththesmallcalculation，especiallymodulationanddemodu

3、lationalgorithmswhichiSdistinctsignificanttoperfectandapplythesoftwareradiotechnologyInthispaperminimumfrequencyshif【keying(MSK)isresearched，whichisaconstantenvelopemodulationtechnologyIthasthecharacteristicofcontinuousp

4、haseandhighbandwidthutilityItiSwidelyappliedinthewirelesscommunicationsystemThepaperintroduces幽ebasictheoryofMSK，andanalysesdeeplythemodulationanddemodulationmethodsforMSK，whichthecorrelativepapersmentionedandpointsoutso

5、meproblems，thenputsforwardtheimprovedmethodsThecarrierrecoverinthecoherentdemodulationforMSKisalsodiscussedThemethodsofcarryingthefrequencyshiftcarrierandmiddlecarrierareputforwardThecorrelativeanalysisandconclusionsarev

6、alidatedbysimulationAccordingtotherequestofsoftwareradioandthecharacteristicofMSK，theimproveddigitalmodulationanddemodulationmethodsforMSKareputforwardThisdigitalmodulationmethodusesthedataofrelevantcodewaveformtoproduce

7、theMSKsignalitsgrogramissimpleandthecalculationissmallThedemodulationmethodusesthedigitaldemodulationalgorithmbasedonDFTItsbasicideaiStodoDFTwiththeMSKsignalsamplesineachcodecircletocalculatethesignalamplitudecorrespondt

8、othecarderfrequenciesof1codeand0code，thenrecoverthedigitalsignalbyjudgingtheamplitude111eresultofsimulationindicatesthatthisalgorithmhasthelesscalculation，thebeRerantinoiseperformance，andthe1esssensitivebitsynchronizatio