新型抗干扰接收机的分析

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1、AbstractMIMO-OFDMtechnologyfullycombinestheadvantagesofMIMOtechnologyandtheOFDMtechnology,whichisappliedtotheLTEsystem.Thistechnologyimprovedchannelutilizationrateandanti-jammingcapability.Channelestimationtechniquesisakeytechnologyforaccuratereceiverforreceiving,sochannelestimationtechn

2、iqueofMIMO-OFDMsystemhasreceivedtheextensiveattentionoftheresearchers.ThispapermainlystudiesthechannelestimationtechniquesofMIMO-OFDMsystem.NonblindchannelestimationofMIMO-OFDMsystemrequiresalotoftrainingsequences,butblindchannelestimationofMIMOOFDMsystemsdonotneedtosendtrainingsequence

3、atthetransmittingandcangreatlyenhancethecapacityofthechannelbandwidthutilizationrate.Theclassicblindchannelsecond-orderstatisticsestimationtechniqueofMIMO-OFDMsystemutilizestheorthogonalcharacteristicsofthesignalsubspaceandnoisesubspace・Wccanminimizethequadraticequationtoestimationthecha

4、nnel.TheimprovedblindchannelestimationalgorithmisstudiedinthispapernamedSOSRIalgorithm,thisalgorithmaddedarepeatfactor,andwecanuselessreceivedsymbolsforbetterchannelestimationaccuracy.What'smore,improvedSOSRIchannelestimationalgorithmisstudiedinthispaper,theimprovedalgorithmmakesthevalue

5、ofrepeatedfactorwider,andcanuselessreceivedsymbolstomakeaccuratechannelestimation.Besides,thesimulationcomparationoftheimprovedalgorithmandclassicalgorithmisgiveninthispaper.Fromthepointofthesimulationresults,theimprovedalgorithmcanuselessreceivedsymbolsforbetterchannelestimationresults-

6、Thelastchapter,variousmodulesoftheLTEsystemarestudied,theimprovedblindchannelestimationalgorithmisappliedtotheLTEuplink,whichimprovedthebandwidthutilizationrateofsystemandanti-jammingabilityatthereceivingend.Keywords:MultipleInputMultipleOutput,OrthogonalFrequencyDivisionMultiplexing,Bli

7、ndEstimation,Subspace目录第一章绪论11.1研究背景11.2盲信道估计技术11.2.1盲估计技术研究历史11.2.2盲估计技术研究现状3MIMO-OFDM系统的研究4MIMO系统概念5MIMO-OFDM系统屮盲估计技术概述51.4MIMO-OFDM盲信道估计存在的不足61.5论文主要贡献61.6论文安排7第二章MIMO-OFDM系统的基础知识8M1M0信道的描述82.1.1MIMO信道的矩阵表示形式82.1.2MIMO信道的物理模型9OFDM技术122.2.1OFDM的系统原理122.2.2OFDM系统的简化数学模型及