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ID:37372065
大小:2.59 MB
页数:77页
时间:2019-05-22
《基于重构观测信号序列的MIMO信道估计技术研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西南交通大学硕士学位论文基于重构观测信号序列的MIMO信道估计技术研究姓名:王一焰申请学位级别:硕士专业:通信与信息系统指导教师:陈庆春20080501西南交通大学硕士研究生学位论文第lI页了观测训练序列样本数,该方法降低了由噪声造成的估计误差,但却使得由信道时变特性造成的估计误差增加。另外,传统ML估计算法所对应的估计误差可视为基于AONSS的ML估计算法以及基于CONSS的ML估计算法所对应的估计误差在没有冗余时的特例。相关仿真结果表明:在信道时变情况下,论文所提出基于重构观测样本的信道估计方法是切实可行的,为深入研究MIMO通信系统下的基于重构观
2、测样本的信道估计提供了一种新的思路和途径。关键词:MIMO,信道估计,累加观测信号序列,级联观测信号序列。西南交通大学硕士研究生学位论文第1Il页AbstractBecauseofhighlyspaceresourceusingefficiencyandhighlyspectrumusingefficiencyandimprovingchannelcapacitygreatlywithoutincreasingchannelbandwidth,Multiple-InputMultiple—Outputsystemischosenasoneofthead
3、vantagedtechniquesforthefuturemobilecommunicationsystem,whichhasbeenthetopicofmanyresearches.Ingeneral,usingspacetimecodecanimproveMIMOsystemcapacity.However,thepreconditionofusingspacetimecodeisthatMIMOchannelinformationcanbeestimatedcorrectly.Onlywiththecorrectestimatedchannel
4、information,MIMOsystemcangettheidealchannelcapacity.Therefore,howtogettheMIMOchannelinformationcorrectlybecomesacrucialproblem.Channelestimation,oneofcrucialtechniquesinMIMOsystem,isinvestigatedinthispaper.Atfirst,fromthetraditionalchannelestimationstrategyusingtrainingsequence,
5、anovelchannelestimationmethod,whichisbasedonreconstructedobservedsignalsequenceisproposed.Basedonredundantinformationusedbythenovelmethod,tWOnewobservedsequencesareproposed:oneisaccumulativeobservednoisysignalsequence(AONSS);theotherisconcatenatedobservednoisysignalsequence(CONS
6、S).Undertheassumptionthatchannelisblackandflatfading,firstly,maximumlikelihood(ML)channelestimation,leastsquare(LS)channelestimationandlinearminimummeansquareerror(LMMSE)channelestimation,whichareallbasedonAONSSandCONSS,arederived.Then,basedonAONSSandCONSS,thegeneralizedrandomCr
7、amer-Raolowerbounds,whichincludetraditionalCramer-Raolowerboundsasspecialcases,arealsoderived.ComparingtotraditionalML,LSandLMMSEestimationalgorithms,theperformancesofproposedML,LSandLMMSEbasedonAONSSandCONSSarebetter.However,thepreconditionofusingAONSSisthateverytransmittedpack
8、age’Strainingsequenceisthesame,usingCONSSdoesn’
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