无线通信中抗多径衰落新技术研究

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1、西安电子科技大学博士学位论文无线通信中抗多径衰落新技术研究姓名：王杰令申请学位级别：博士专业：通信与信息系统指导教师：杨宏;易克初20091201无线通信中抗多径衰落新技术研究了该系统的干扰抵消检测方案，与单载波传输系统类似，该MIMo系统中的干扰抵消技术也能改善初始均衡器的检测性能。然后进一步提出该系统的空时二维脚分集接收方案，将接收信号中的各条多径分量分解后分别进行空时分组码的空时合并，然后再进行多径分集合并，在获得空时分组码提供的空间分集增益基础上，进一步取得多径的分集增益。此外，在非扩频的

2、多用户MIMO通信系统中实现了空时二维凡气l江接收；当各用户信息从接收信号中分解后，分别独立进行空时二维分集合并，获得空间与多径的分集增益。仿真结果表明，所提出的几种算法都可以良好工作。关键词：频带效率单载波块传输分集增益干扰抵消RAl@接收机AbstralctAbstractWitlltllei11creaSingdeVelopmentofV撕ouSservlcesVia诵relesscomm砌catiOllSsuchaSmobilevoice，da妇，image，multimediaandin

3、temetapplicationsintherecentyears，thewirelesscommunicationisrequiredtoproVidemghertransmissionratewitllhi曲erreliabili吼sothatanti-multipath—f．adingtechlliqueshaVebeenahotpointint11isI．esearcharea．Tllisdissert“onresearchesonblock仃：msmissionsystem，paying

4、greatattentiontothe能quencybande珩ciencyaSweUaLsthet砌smissionperf．omanceinthemultipathf．adingcharulels．Themaincontributionsofthedissertationareasfollows．AmultipleblocksjointmodulationtechIliqueisproposed．T11rou曲analyzingthespectmlpropenyofquasi—oIrthogo

5、naltimediVisionmultiplexing(QOTDM)system，amodifjedQOTDMsystemschemea11dablindequalizerforthesystemareproposed．Then，aimingattheproblemofhowt0reducettleredundancyofthecyclicprefix(CP)insinglecaI—erblocktmsmission(SCBT)andonhogonalfIrequencydiVisionmulti

6、plexing(OFDM)systems，aQOTDMbasedblockmodulation(BM)algorithmisproposed，、Ⅳhere衄JhipleblocksarejointlymodulatedtogethertoshareaCP，whichremarkablyincreaSesitsbande缳ciency．WhentheBMf．rameisdecomposedatmereceiver，themultipleblockscanbeobtajnedf如mthereceive

7、dsignal谢thoutinter-blockinte疵rence(IBI)．TheBMalgori咖ncaIlbe印pliednotonlytoSCBTandOFDMsystems，butalsotomulti—inputmulti—output(MIMO)orMIMO-OFDMsystems．Theoreticala11alysisandsimulatioIlSshowtllatmeproposedsystemschemeforslow-f．adingch锄elshaLsmuchhi曲erb

8、andemciency诵thoutperfo珊ancedegradationcomparedwitht11eexistiIlgalgorit№s．Anovelbidirectionalarbitrateddecisionfeedback(BAD)equalizerispresentedfor似。一pathfadingchannels，whichcalle行IectiVelyimproVemebit—e11rorped．onllancebyacquiringdiVersi够gains