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1、ThisfulltextpaperwaspeerreviewedatthedirectionofIEEECommunicationsSocietysubjectmatterexpertsforpublicationintheIEEEICC2011proceedingsChipEqualizationUsingSubbandAdaptiveDecompositioninDownlinkMIMODS-UWBChia-ChangHuandYung-ChengLiaoDepartmentofCommunicationsEngineering,Nat
2、ionalChungChengUniversity,168,UniversityRd.,Min-Hsiung,Chia-Yi621Taiwane-mail:ieecch@ccu.edu.tw;haspor0403@gmail.com;AbstractAnadaptivesubbandchip-equalizerisinvestigatedappliedtoUWBsystemsinordertosuppressinterferenceandfordownlinkmultiple-inputmultiple-output(MIMO)direct
3、-increasesystemthroughput[7],[8].Additionally,authorsinsequence(DS)ultra-wideband(UWB)systemstocopewith[9]developaMUDschemeusingjointadaptive?lterandtheinter-symbolinterference(ISI)andthemultiple-accessin-space-timesignalprocessingforMIMODS-UWBsystems.terference(MAI)inmult
4、ipathfadingchannels.ThesubbanddecompositiontechniqueisemployedtoimprovesubstantiallyInmulti-antennasystems,thedimensionoftheobservationthedownlinkreceptionofmobile-terminalreceiverswithoutvectorishigherthansingle-antennasystems,thecomplexitycompromisingtheoverallcomputatio
5、nalcomplexity.Areduced-costoftheMMSEreceiverinMIMOsystemsisthereforecomplexitychip-equalizationschemeisproposedbymakingusemuchmoreexpensivethanthatinsingle-inputsingle-outputofthearchitectureofthereduced-rank(RR)multistagematrix(SISO)systems.Morerecently,researchersin[10]p
6、roposeWiener?lter(MMWF)insubbands.Simulationsareconductedtoprovideacomparativeevaluationoftheproposedsubbandasubbandadaptivechipequalizer(SACE)basedonthechip-equalizerwithotherexistingfull-bandandsubbandchipMMSEperformancecriterionforDS-CDMAdownlinksys-equalizers.temsoverd
7、ispersivechannels.TheMSEperformanceoftheIndexTermsDS-UWB,MIMO,MMSE,multistagematrixSACEadaptedbythenormalizedleast-mean-square(NLMS)Wiener?lter,subbandadaptive?lter.algorithmissigni?cantlybetterthanthatofthefullbandcounterpartsundermultipathfadingchannels.Therefore,tofurth
8、erenhancethesystemperformanceandalleviatetheI.INTRODUCTIONcomputationalcomplexityoftheMMS
