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基于空间分集的判决反馈结构联合盲均衡算法.docx

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基于空间分集的判决反馈结构联合盲均衡算法 Abstract Withtherapiddevelopmentofwirelesscommunicationtechnology,thedemandforhigh-speedandreliablecommunicationsystemsisincreasing.Toovercomethechallengescausedbythefadingandinterferenceinwirelesschannels,blindequalizationbecomesanimportantandeffectiveapproach.Thispaperproposesajointblindequalizationalgorithmbasedonspacedivisionanddecisionfeedbackstructure,whichcombinestheadvantagesofspacedivisionanddecisionfeedbackstructuretoimprovetheequalizationperformanceofthewirelesscommunicationsystem. Introduction Wirelesscommunicationsystemssufferfrommultipathfadingandinterference,whichgreatlydegradethequalityofwirelesstransmissions.Toimprovetheperformanceofwirelesssystems,equalizationtechniquesarewidelyusedinwirelesscommunicationsystemstoeliminatetheeffectsofmultipathfadingandinterference.Blindequalization,whichdoesnotrequiretheknowledgeofthetransmissionchannel,isanimportantapproachtoequalization,especiallyformobilecommunicationsystemswherethechannelmayvaryrapidly. Spacedivisionisanotherimportanttechniquethatcanbeusedtoimprovetheequalizationperformance.Itmakesitpossibletofullyutilizethespatialdiversitythatexistsinmultipleantennasystems,suchasMIMO(Multiple-InputandMultiple-Output)systems.Decisionfeedbackequalization(DFE)isanotherwidelyusedequalizationtechnique,inwhichtheequalizerfiltersthereceivedsignalinbothforwardandbackwarddirections,whichmakesitaneffectivemeansofreducingtheinterference.Inthispaper,weproposeanewjointblindequalizationalgorithmbasedonspacedivisionanddecisionfeedbackstructure,whichcanfurtherimprovetheequalizationperformanceofwirelesscommunicationsystems. TheProposedJointBlindEqualizationAlgorithm TheproposedjointblindequalizationalgorithmbasedonspacedivisionanddecisionfeedbackstructureisshowninFig.1. Firstly,thereceivedsignalistransmittedtothespacedivisionmodule,whichseparatesthesignalintosubstreamsbasedonspacedomain,whichmeansthatthesignalreceivedfromdifferentantennascanbeseparatedintodifferentsubstreams.Then,thesubstreamsaresenttotheb