2011_Chip Equalization Using Subband Adaptive.pdf

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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]developaMUDschemeusingjointadaptivefilterandtheinter-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、roposeWienerfilter(MMWF)insubbands.Simulationsareconductedtoprovideacomparativeevaluationoftheproposedsubbandasubbandadaptivechipequalizer(SACE)basedonthechip-equalizerwithotherexistingfull-bandandsubbandchipMMSEperformancecriterionforDS-CDMAdownlinksys-equalizers.temsoverd

7、ispersivechannels.TheMSEperformanceoftheIndexTermsDS-UWB,MIMO,MMSE,multistagematrixSACEadaptedbythenormalizedleast-mean-square(NLMS)Wienerfilter,subbandadaptivefilter.algorithmissignificantlybetterthanthatofthefullbandcounterpartsundermultipathfadingchannels.Therefore,tofurth

8、erenhancethesystemperformanceandalleviatetheI.INTRODUCTIONcomputationalcomplexityoftheMMS