基于SC―FDE的頻率選擇性衰落信道中的空時分組編碼系統(tǒng)性能研究

精品文檔-下載后可編輯基于SC―FDE的頻率選擇性衰落信道中的空時分組編碼系統(tǒng)性能研究Abstract：Inthefrequencyselectivefadingchannel，theorthogonalspace-timeblockcodewithsingle-carrierfrequencydomainequalization（OSTBC-SCFDE）systemcaneffectivelycombatthefrequencyselectivefading，andachievefulldiversitygain.Ithasattractedwidespreadattention.However，itdoesnotachievefullratetransmissionwhenmorethantwotransmitantennas.Inordertoovercometheshortcomingsoftheprogram，thispaperstudiestherotationmatrixquasiorthogonalspace-timeblockcodewithsingle-carrierfrequencydomainequalizaton（RM-QOSTBC-SCFDE）.Simulationresultsshowthatwhenthenumberoftransmitantennasis4，thisprogramnotonlyachievefullratetransmissionbutalsogetahighdiversitygain.

Keywords：orthogonalspace-timeblockcode（QOSTBC）；rotationmatrix；single-carrierfrequencydomainequalization（SC-FDE）；frequencyselectivefading

Introduction

Inthefrequencyselectivefadingchannel，SCFDE[1]caneffectivelycombatthefrequencyselectivefading，andavoidhighPAPRandfrequencyoffsetsensitiveoftheOFDMsystem.STBC[2]withmultipletransmitandreceiveantennasestablishmultiplesindependentcommunicationlinkstorealizesthehigherdiversitygain.Ifcombinethetwo，notonlycanovercomefrequencyselectivefadingofwirelesschannel.butalsocanachievediversitygain.Thereisawideapplicationprospectinthefieldofbroadbandwirelesscommunications.

CurrentresearchfocusesonOSTBC-SCFDE，suchasNaofalAl-Dhahir[3]studiedtheAlamouti-SCFDEtechnologies.Butstudiesshowthattheprogramcannotachievefullratetransmissionwhenmorethantwotransmitantennas.Jafarkhani

[4]andTBH[5]proposedQOSTBCbysacrificingpartofthediversitygainachievedfullratetransmission.However，theschemeissuitableforflatfadingchannels.Whenappliedtofrequencyselectivefadingchannel，thedecoderandequalizerwouldbeverycomplicated.Literature[6]studiedRM-QOSTBCintheflatfadingchannel.Literature[7]proposedanimprovedQOSTBC-SCFDEwithfourtransmitantennas.Althoughtherealizedfullratetransmissioninthefrequencyselectivefadingchannel，butthesystemdiversitygainisonlytwo.ThispaperstudiesRM-QOSTBC-SCFDE，throughtherotationmatrixtoeliminatethecorrelationofthechannelmatrixthatmakethedecoderismoresimple.Bythiswaynotonlyovercomethefrequencyselectivefading，toachievefullratetransmission，butalsoachievehigherdiversitygain.

1BasedonfourtransmitantennasOSTBC-SCFDEtechnology

Whereisadiagonalmatrix.Thevalueofisequalto.Thisshowsthatthediversitygainis4.thecoefficientoftheMMSE-FDEinthiscaseisequalto，whereINisNxNXunitmatrix.

2BasedonfourtransmitantennasRM-QOSTBC-SCFDEtechnology

Throughtheaboveanalysisshowsthat4transmitantennaOSTBC-SCFDEtechnologycouldovercomethefrequencyselectivefadingandachievefulldiversitygaininthefrequencyselectivefadingchannel，buttherateisonly1/2.Inordertoachievefullratetransmission，highdiversityandlowdecodingcomplexity，thispaperstudiestheRM-QOSTBC-SCFDEtechnology.Atpresent，theresearchesofQOSTBCmainlyfocusonflatfadingchannels.BasedontheconstellationrotationQOSTBCachievefullrateandfulldiversity，butthedecodingandSCFDEofthereceiverwillbecomemorecomplex.RM-QOSTBC-SCFDE.

4conclusions

Infrequencyselectivefadingchannel，theOSTBC-SCFDEtechnologyovercomesthefrequencyselectivefading，andachievefulldiversitygain.Itimprovestheperformanceofthesystem，andhasbroadapplicationprospects.However，，theprogramcanachievefulltransmissionratewhenmorethantwotransmitantennas.Thisseriouslyaffectsthepracticalapplicationofthesystem.Inthispaper，theRM-QOSTBC-SCFDEoffourtransmitantennassacrificessomediversitygaintoachievefullratetransmission.Ithasacertainpracticalvalue.

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