基于mimo-ofdm系统的正交空时分组码+单位抗衰落复正交空时分组码级联的turbo码 毕业论文外文翻译

《基于mimo-ofdm系统的正交空时分组码+单位抗衰落复正交空时分组码级联的turbo码 毕业论文外文翻译》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、外文资料（一）OnOrthogonalSpace-TimeBlockCodesforMIMO-OFDMSystemsSpace-timecodeinmobilecommunicationsystem,andorthogonaldesinginmultiple-antennasscnemearedicsussed.Bythemethods,dataisencodedusingaspace-timeblockcodeandissplitintoseveralstreamswhicharesimultaneouslytransmittedbyanten

2、nas.Soamaximum-likelihooddecodingalgorithmcanbeusedatthereceivertoachievethemaximumdiversityorderIntroductionMostworkonwirelesscommunicationshadfocusedonhavinganantennaarrayatonlyoneendofthewirelesslink—usuallyatthereceiver.SeminalpapersbyGerardJ.FoschiniandMichaelJ.Gans[1],F

3、oschini[2]andEmreTelatar[3]enlargedthescopeofwirelesscommunicationpossibilitiesbyshowingthatforthehighly-scatteringenvironmentsubstantialcapacitygainsareenabledwhenantennaarraysareusedatbothendsofalink.Analternativeapproachtoutilizingmultipleantennasreliesonhavingmultipletran

4、smitantennasandonlyoptionallymultiplereceiveantennas.ProposedbyVahidTarokh,NambiSeshadriandRobertCalderbank,thesespace–timecodes(STCs)achievesignificanterrorrateimprovementsoversingle-antennasystems.Theiroriginalschemewasbasedontrelliscodesbutthesimplerblockcodeswereutilizedb

5、ySiavashAlamouti,andlaterVahidTarokh,HamidJafarkhaniandRobertCalderbanktodevelopspace–timeblock-codes(STBCs)[4].STCinvolvesthetransmissionofmultipleredundantcopiesofdatatocompensateforfadingandthermalnoiseinthehopethatsomeofthemmayarriveatthereceiverinabetterstatethanothers.I

6、nthecaseofSTBCinparticular,thedatastreamtobetransmittedisencodedinblocks,whicharedistributedamongspacedantennasandacrosstime.Whileitisnecessarytohavemultipletransmitantennas,itisnotnecessarytohavemultiplereceiveantennas,althoughtodosoimprovesperformance.Thisprocessofreceiving

7、diversecopiesofthedataisknownasdiversityreceptionandiswhatwaslargelystudieduntilFoschini's1998paper.AnSTBCisusuallyrepresentedbyamatrix.Eachrowrepresentsatimeslotandeachcolumnrepresentsoneantenna'stransmissionsovertime.Here,sijisthemodulatedsymboltobetransmittedintimeslotifro

8、mantennaj.TherearetobeTtimeslotsandnTtransmitantennasaswellasnRrecei