擴(kuò)頻通信中Rake接收機(jī)研究及數(shù)字化設(shè)計(jì).pdf

1、重慶大學(xué)碩士學(xué)位論文擴(kuò)頻通信中Rake接收機(jī)研究及數(shù)字化設(shè)計(jì)姓名：方丹申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：譚曉衡201004英文摘要IIIABSTRACTWiththefurtherdevelopmentofwirelesscommunicationthe3Ghasbeengraduallyusedindailylife.Atthesametimeduetoitsuniquecapacityofantiinterferenc

2、eantimultipathsoftcapacitiessoonthetopthree3GcommunicationstardswhicharecommonlyusedaroundthewldareallonthebasisofCodeDivisionMultipleAccess(CDMA).RakereceiveristhecepartintheCDMAsystemswhenimplementingmultipathdiversity

3、receptionalsooneofthekeystotheCDKAspreadingspectrumcommunicationsystems.Itcanseparatemultipathsignalsimplementtimediversity.ByusingmultipathvectseffectivelyItovercomestheinfluenceofmultipatheffectsfinallyreceivesanimprov

4、ementonthesystem’sperfmance.InthisthesisthestructureoftheRakereceiverbasedonDMFisintroducedfirstlythentheacquisitionBitErrPerfmance(BER)isdeeplyanalyzedsimulated.ThespreadspectrumcommunicationsystemwithRakereceiverbasedo

5、nDMFisdigitallydesignedunderQUARTUSfinally.Themainwkconclusionsareasfollows:Firstlyinterrelatedtheiesonspreadspectrumcommunicationareintroduceddetailedly.Thispartstudysmultipathfadingchannelmodelsinwirelesschannelthenana

6、lyzessimulatestheBERoftraditionalreceiverinthemultipathchannel.SecondlyaftersimulatingcombinationgainsofseveraloftenuseddiversitycombinationpatternsthisthesisdeeplystudysthewkingproceduredeterminationofparametersfRakerec

7、eiver.ThenaspreadspectrumcommunicationsystemwithRakereceiverbasedonDMFisbuiltunderSimulink.OnthisbasistheBERcurvesofRakereceiverinmultipathchannelareobtained.ThesimulatedresultsindicatethatcomparedtotraditionalreceiverRa

8、kereceiverhasabettercapacityofantimultipath.AfterananalysisofitsstructuretheacquisitionofRakereceiverbasedonDMFismainlyresearchedin.Byusingthestatetransitiondiagramthisthesisderivesanalyticexpressionsofthemeanacquisition