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2023年12月22日发(作者：汇编语言实现大小写字母转换)
MMSEExtensionofV-BLASTbasedonSortedQRDecompositionDirkW¨ubben,RonaldB¨ohnke,VolkerK¨uhn,andKarl-DirkKammeyerDepartmentofCommunicationsEngineeringUniversityofBremenOtto-Hahn-Allee,D-28359Bremen,GermanyEmail:{wuebben,boehnke,kuehn,kammeyer}@ract—Inrich-scatteringenvironmentslayeredspace-timearchitecturesliketheBLApaper,wepresentanovel,computationallyefficientalgoritizesasortedQRdecompositionalgorithmneedsonlyafractionofcomputationaleffortcomparederms—BLAST,MIMOsystems,Zero-ForcingandMMSEdetection,ionII,rtosimplifylaterderivationwerecallthelinearZFandMMSEfiectionofBLASTsystemsusiputationaleffortandtheperformanceanalysisaregiveninSectionVandVI,DESCRIPTIONWeconsideramultipleantennasystemwithnTtransmitandnR≥aisdemultiplexedintonTdatasubstreamsofequallength(calledlayers).Thesesubstreamsareoptionallyencodedbyaconvolutionalcode(CC),bit-interleaved,mappedontoM-PSplicitywewillassumeuncodedsubstreamsforthederivationofthedetectionalgorithms,butwUCTIONInrich-scatteringenvironmentstheV-BLAST(VerticalBellLabsLayeredSpace-Time)architectureproposedin[1]averticallylayeredcodingstructure,whereindependentcodeblocks(calledlayers)eceiver,theselayersaredetectedbyasuccessiveinterferencecancellationtechniquewhichnullstheinterferersbylinearlyweightingthereceivedsignalvectorwithazero-forcingnullingvector(ZF-BLAST).Thissuccessivedetectionrequiresmultiplecalculationsofpseudo-inverses,edcomplexitydetectionalgorithmutilizingasortedQRdecom-positionofthechannelmatrixwasproposedbytheauthorsin[2],[3].ItjointlycalculatesanoptimizeddetectionorderandtheQRdecompositionofthechannelmatrixandiscalledZF-SQRD(ZFSortedQRDecomposition).AnadaptionoftheoriginalZF-BLASTtotheMMSEcriterionwaspresentedin[4]andaversionwithlowercomplexitywasintroducedin[5].Inthispaper,weextendtheZF-SQRDalgorithmtotheMMSEsolution,rtoZF-SQRDitdoesnotalwaysfindtheodrawbackisnotacceptableforthespecificapplication,apost-sortingalgorithm(PSA)canbeused,leadinr,thecombinationofMMSE-SQRDandPSArequiresonlyafrrkwassupportedinpartbytheGermanministryofeducationandresearch(BMBF)undergrant01BU153.s1h1,1n1hnR,1h1,nTsnThnR,nTx1ReceiverDetector&rtodescribetheMIMOsystem,1s=[s1...snT]TdenotethenT×1transmitsignalvector,thenthecorrespondingnR×1receivesignalvectorx=[x1...xnR]Tisgivenbyx=Hs+n.(1)In(1),n=[n1...nnR]Trepresentswhitegaussiannoise2observedatthenRreceiveantennaswhileofvarianceσnthispaper,(·)Tand(·)Hdenotematrixtransposeandhermitiantranspose,rmore,Iαindicatestheα×αidentitymatrixand0α,βdenotestheα×βallzeromatrix.1Throughout0-7803-7954-3/03/$17.00 ©2003 IEEE.508
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