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1、IEEETRANSACTIONSONSIGNALPROCESSING,VOL.59,NO.4,APRIL20111883DS-UWBDownlinkSubbandAdaptiveChip-providingaperfectestimateofthedownlinkchannel,itusuallysuffersEqualizationUsingReduced-RankMultistagefromthenoiseenhancementproblem.TheMMSE-basedchipequal-WienerFilteringTechni
2、queizer[4]isabletorestorethecodeorthogonalityamongMTswithinacell.Asaresult,asimpledespreadersufficestocanceltheMAIChia-ChangHuandJian-FongChangfromintracelluserseffectivelyatthedownlinkreceiver.Furthermore,recentresearchworksrelevanttochipequalizationfordownlinkcode-divi
3、sionmultipleaccess(CDMA)haverevealedthefactthattheAbstract—Acomputationallyefficientsubbandadaptivechip-equalizerMMSEchipequalizerwithperfectchannelestimationproducesbetterisinvestigatedfordownlinkdirect-sequence(DS)ultra-wideband(UWB)performancethantheZF-basedchipequali
4、zer[5].Tofurtherenhancesystemstocopewithboththeintersymbolinterference(ISI)andthemul-thesystemperformanceandalleviatethecomputationalburden,thetiple-accessinterference(MAI)inmultipathfadingchannels.Thisadap-tivechip-equalizationisdevelopedbasedontheutilizationofthereduc
5、ed-subbandadaptivefiltering(SAF)schemeoffersaneffectiveandrobustrank(RR)multistageWienerfilter(MWF)insubbands.Asaconsequence,means[6].Itiswellknownthatthesubbanddecompositiontechniquetheproposedsubbandchip-equalizerachievesasubstantialsavingincom-accomplishesnotablesucces
6、sforawidevarietyofadaptivefilteringplexitywithoutcompromisingsystemperformance.Simulationsarecon-applicationsduetothepromisingcharacteristicsofthecomputationalductedtoprovideacomparativeevaluationoftheproposedsubbandchip-equalizerwithotherexistingfullbandchipequalizers.r
7、eduction,thedecorrelatingeffectoffilterbanks,andtheparalleliza-tionarchitecture.Therefore,thissubband-partitionstructurepossessesIndexTerms—Chip-equalizer,DS-UWB,MMSE,multistageWienerfilter,subbandadaptivefilter.thepotentialforafasterconvergencerateandalowercomputationalco
8、mplexitythanafullband-basedscheme.Morerecently,authorsin[7]proposeasubbandadaptivechipequalizer(SACE)basedonI.
