固定天線數(shù)的自適應混合空時編碼方案.pdf

1、大連理工大學碩士學位論文固定天線數(shù)的自適應混合空時編碼方案姓名：王卓申請學位級別：碩士專業(yè)：電子與通信工程指導教師：孫怡20090104大連理工大學專業(yè)學位碩士學位論文TheAdaptiveHybridMIMOSchemewithFixedAntennasAbstractMultiple—InputMultipleOutput(MIMO)technology，incorporatingtransmitdiversityandreceiv

2、ediversity，increasesthecapacity，datarateandspectralefficiencyofwirelesscommunicationsystems，andresiststhefadingeffectively，realizingthereliablecommunicationSTBCusestheprincipleoforthogonaltoobtainhighdiversitygainthushas

3、guaranteedthestronganti—fadingabilitybutthedatarateislowTheVBLASTisessentiallytodividethehilghdataserviceintocertainlowspeeddataservicesItcarriesonthelayeredspacetimeencodingaftertheordinaryparallelchannelencoderthenbemo

4、dulatedandtransmittedbymultipleantennasSoitrealizesthetransmissiondiversityItfullyUSeswirelesschannel’SmultipathpropagationcharacteristictoachievethegoalfordiscriminatingthechannelsignalItscharacteristicisthatthestructur

5、eissimpleandeasytealize，thespectralefficiencyishigher，buttheantifadingperformanceisbadThisarticlesynthesizesthecharacteristicsofthetwocodingtechniqueandtakesthecompromisebetweenthespeedanddiversityOnesystemwithfourtransm

6、issionandfourreceiverantennascombingSTBCandVBLASTisproposedandgroupinterferencesuppressionisusedtoreducedecodingcomplexityofthishybridencodingsystemenormouslyTofurtherenhancesystemsperformance，theantennaselectiontechnolo

7、gyisusedatthetransmitterbyconsideringeachantennaasonepartofthesystemAsthesignal—to—noisepowerratioofeachantennasubsyStcmisdirectlyproportionaltothesquareof2normofitschannel—gain，SOitc孤comparethesquareof2normofchannelgain

8、witheachantennasub—systemtofindoutthechannelperformanceofeachantennaThepurposeist0adjusttheantennastosendthespacetimeblockcodes(STBC)intimewiththechannelperformanceofeachantennaSoitcanimprovetheperformanceofthebadantenna

9、sbytransmittingthespacetimeblockcode(STBOwithhighdiversitygain，andachievethegoalofimprovingperformanceoftheintegratedsystemThegoalistoreducethesymbolerrorrateinthesameantennasThesimulationresultindicatesthattheperformanc