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1、2258IEEETRANSACTIONSONSIGNALPROCESSING,VOL.50,NO.9,SEPTEMBER2002BlindDetectionofMultirateAsynchronousCDMASignalsinMultipathChannelsJinghongMaandJitendraK.Tugnait,Fellow,IEEEAbstract—Blinddetectionofadesireduser’ssignalinamul-Next-generationwirelesssystemsaimtoprovidehigh-speedtiratedirectsequence
2、codedivisionmultipleaccess(DS-CDMA)accessformultimediaservices(voice,video,anddata).Theresystem[usingeithervariablesequencelength(VSL)ormulticodeareinherentdifferencesinthedataratesofthesediverse(MC)access]isconsidered.Acode-constrainedinversefiltercri-informationsources.Therefore,multirateDS-CDM
3、Asystemsterion(IFC)-basedblinddetectorforequal-rateCDMAsignalstodetectadesireduser’ssignalwasrecentlypresentedbyTugnaithavebeeninvestigatedintheliterature[1]–[9]inordertoandLi.TheIFCmethodexploitsthehigherorderstatisticsoftheaccommodateusersofdifferentsymbolrates.Schemestodata.InmultirateCDMAsyst
4、ems,ahigh-rateusersignalmayextendsingle-rateCDMAsystemstooffermultipledataratesbetreatedasthesuperpositionofseveralvirtualbasic-ratesig-includemulticode(MC)transmissionandvariablesequencenals.Thecode-constrainedIFC-baseddetectormaybeusedtode-length(VSL)[whichisalsocalledvariableprocessinggaintect
5、agivenbasic-ratevirtualsignal.This,however,doesnotsolve(VPG)ormultipleprocessinggain(MPG)]access[1]–[5].Intheproblemofcombiningthedetectedvirtualbasic-ratesignalstoyieldtheoriginalhigh-ratesignalsincetheformermaybede-VSLsystems,thechiprateisconstant,anddifferentdatarateslayedbydifferentequalizati
6、ondelays,maybemultiplyextracted,areaccommodatedwiththeassignmentofsignaturesequencesandmaybeindifferent“order.”Inthispaper,novelapproachesofdifferentlengths[1],[5].InMCsystems,highrateuserscombiningthecode-constrainedIFCandapenaltyfunctionareareaccommodatedbymultiplexingtheirdataontoseveraldevelo
7、pedtocopewiththisproblemforVSLandMCmultiratesignaturesequences[5].Ahighrateuserattimesa“basicaccessmethods.Globalminimaoftheproposedcostfunctionsareanalyzed.Threeillustrativesimulationexamplesarepresented,in-rate”iscon
