多天线系统中分层空时编码技术的研究

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1、上海交通大学硕士学位论文多天线系统中分层空时编码技术的研究姓名：李琰申请学位级别：硕士专业：通信与信息系统指导教师：宋文涛20060101上海交通大学工学硕士学位论文摘要天线相关，或由于信道矩阵秩的变化，可能形成各种非理想的信道模型。因此对相关MIMO信道下的空时系统的研究更具有现实意义。于是本文也基于该考虑，在解决了前一个问题的基础上，对相关信道下的分层空时系统提出了解决方案。考虑到弱信道相关性对于系统的性能影响不大，本文将天线选择技术应用到了相关衰落的分层空时系统中。仿真结果表明，天线选择技术对于强相关衰落下的分层空时系统

2、的性能改善确实很好，而且复杂度并不高，因此具有很高的实用价值。关键词：多天线系统，垂直贝尔实验室分层空时结构，相关信道第II页上海交通大学工学硕士学位论文英文缩略语表STUDYONLAYEREDSPACE-TIMETECHNIQUESINMULTIPLEANTENNASYSTEMSABSTRACTThemajorchallengesinthefuturewirelesscommunicationssystemdesignsaretoincreasespectralefficiencyandimprovelinkreliabil

3、ity.VerticalBellLabs.LayeredSpace-time(V-BLAST)coding,oneofthetechnologiesofMultiple-InputMultiple-Output(MIMO)signalprocessing,isregardedasoneofthemostpromisingsolutionsforenhancingthedataratesofnextgenerationwirelesscommunicationsystemsoperatinginfrequency-selecti

4、vefadingenvironments.ThoughtraditionalV-BLASTschemecouldbringratherhighbandefficiency,itsgreatshortcomingisthatthedecodingprocedurecouldinducterrorpropagationandtheperformanceofthebiterrorrateisnotwhatdesired,whichgreatlylimitsitscommercialvalueinpractice.Therefore,

5、howtoconstructaschemethatisabletoofferhighdatarate,higherrorrateperformanceandlowcomplexityisthekeypointforthecurrentresearchonV-BLAST.ThispaperexplorestheBERperformanceofsuccessiveinterferencecancellation(SIC)receiversfornarrowbandV-BLASTsystems.TocombatthepoorBERp

6、erformanceofthefirstdatastreamandpossibleresultingerrorpropagation,weproposedamodifiedmethodtoapplydifferentdataratebythetransmitteroneachV-BLASTdatastream.Oneimportantadvantageofthemethodisthattheoptimalorderingdoesnotneedtobedeterminedbecausetheallocationofdatarat

7、eassumesthereceiverdetectsthestreamsinapre-definedorder.Consequently,thecomplexityoftheconventionalSICreceiverofV-BLASTsystemsisgreatlyreduced.Asweknown,mostclassicalresearchonMIMOsystemisassumedthatthechannelisideal.Thatis,thechannelisuncorrelatedfadingandhighrank.

8、第III页上海交通大学工学硕士学位论文英文缩略语表Inpractice,however,avarietyofnon-idealchannelsmayoccurforthecorrelationintransmitterandreceiverorforchangesofthec