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1、AbstractAgreatdevelopmenthasbeenacceleratedsince1948，afterShannonpublishedhispaper“Amathematicaltheoryofcommunication'’．ThemostimportantachievementmustbetheTurboCode．BecauseofitsgoodperformanceofclosingtOShannonlimit,since1993aftertheTurbocodeWasraised，thecommunicationareapaygreatattentiontoit，andit
2、becameoneofthekeyareasofresearchinchannelcoding．Aftertensofresearchanddevelopment，thetheoryofTurbohasbeencompletedmostly,anditcannowbeusedinarealsystem，sothispapermainlydescribeshowtOimplementtheTurbodecoderbyusingDSPprocessor．Thethesisincludesthefollowingparts：First，theprincipleofTurboencodeanddeco
3、deisintroduced，includingdecoder、encoder、decodingalgorithms．Thentheprincipleofthesetwodecodingalgorithmsisderived，andthesimulationresultsoftheMatlabprogramsofthesetwodecodingalgorithmtitlegiven．Secondly,thehardwareplatformofachievingTurbodecoderisdescribed：XXXDSP,includingtheresources、theinstructions
4、etandthememoryspaceofit．Andthespecificrequirementofevaluating、thedatashouldbegivenandthestepsofevaluatingaredescribed．Thirdly,wediscussedthewaytOrunthefloat-pointprogramonfix—pointDSP,andthesimulationresultsofthetwof．X—pointprogramsarcgiven．FinallywecompletedTurbodecoderwhichusedSOVAdecoderalgorithm
5、byusingXXXDSPinstructionset．wedescribedindetailhowtoachievethepartsofdecoderandthedecodingalgorithminassemblyinstructionset,andrunthedecodingprogramontherealchip’Sverificationplatform；theresultsareclosetotheMatlabsimulationresultsofthefix-pointedprograms．Keyword：TurboSOVAdecodingalgorithmDSPProcesso
6、r目錄第一章緒論?????????????????????．．11．1數(shù)字通信原理????????????????????．．11．2信道編碼的發(fā)展????????????????????11．3Turbo碼的提出與研究現(xiàn)狀????????????????．．21．3．1Turbo碼的提出??????????????????．．21．3．2Turbo碼的研究現(xiàn)狀?????????????????．21．4本文的內(nèi)容?????????????????????．4第二章Turbo編譯碼原理與譯碼算法原理????????????52．1Turbo編碼原理及編碼器結(jié)構(gòu)????????????????5
7、2．2Turbo譯碼原理及譯碼器結(jié)構(gòu)????????????????72．3Turbo碼的譯碼算法??????????????????．．82．3．1譯碼準則????????????????????．82．3．2MAP譯碼算法原理??????????????????92．3．3Log_Map譯碼算法原理????????????????．．122．3．4Max—Log-Map算法原理????????
