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1、1646IEEEJOURNALONSELECTEDAREASINCOMMUNICATIONS,VOL.19,NO.8,AUGUST2001JointIterativeDecodingofSeriallyConcatenatedErrorControlCodedCDMAZhenningShiandChristianSchlegel,SeniorMember,IEEEAbstract—JointiterativedecodingofmultipleforwarderrorAnimportantstepforw
2、ardistherealizationthatCDMAcontrol(FEC)encodeddatastreamsisstudiedforlinearmultiplecombinedwithconvolutionalcodingcanbeviewedastheaccesschannels,suchascode-divisionmultipleaccess(CDMA).concatenationofabankoferrorcontrolcodeswitha“channelItisshownthatsuchs
3、ystemscanbeviewedasseriallyconcate-encoder”—theCDMAchannel—separatedbyinterleavers(ifnatedcodingsystems,andthatiterativesoft-decisiondecodingcanbeperformedsuccessfully.Toimprovepowerefficiency,powerfulpresent).SerialturbodecodingprinciplescannowbeusedonFE
4、Ccodesareused.TheseFECcodesarethemselvesseriallycon-suchsystemsandhavebeenproposed[17],[14],[1],[23].Incatenated.Theoveralltransmissionsystemcanbeviewedasthethesesystems,aCDMAaposterioriprobability(APP)decoderconcatenationoftwoerrorcontrolcodeswiththeline
5、armultipleandabankofsingle-usererrorcontrolAPPdecodersformaaccesschannel,andsoft-decisiondecodersareusedateachstage.closedloopsystemandupdatedsoftinformationisexchangedAvariancetransferfunctionapproachappliedtotheanalysisofthissystemcapturestheroleoftheco
6、mponentdecodersinaninaniterativefashionanalogouslytoturbodecoding[3],[7].overalliterativedecodingsystem.WeshowthatthisapproachMoher[14]demonstratedbysimulationthatthecombinationformsamethodologytostudytheeffectsofthecomponentcodesofFECandrandominterleavin
7、gcanachieveoptimalasymp-aswellasthatoftheiterationschedule.Analysisandsimulationtoticefficienciesevenwithhighlycorrelatedsignalsofthedif-examplesarepresentedfortransmissionsystemsthatoperatecloseferentusers.PowerfulFECcodescombinedwithlargeinter-totheShan
8、nonlimitandillustratetheaccuracyoftheanalysis.leaversizesimproveperformanceoverthatofusingonlysimpleIndexTerms—CDMA,iterativedecoding,multiuserdetection,FECcodes,andcreateaturbocliffregion,thatisaregionwhereserialco
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