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1、摘要低密度奇偶校驗(yàn)碼是一種接近香農(nóng)極限的信道編碼,在極低的信噪比環(huán)境下仍能獲得優(yōu)異的誤碼率性能,在通信領(lǐng)域正得到越來(lái)越多的關(guān)注。在未來(lái)的通信系統(tǒng)中,高速率數(shù)據(jù)傳輸將是其業(yè)務(wù)的核心。本文首先簡(jiǎn)要介紹低密度奇偶校驗(yàn)碼的發(fā)展歷史、優(yōu)點(diǎn)、現(xiàn)狀、分類(lèi)、校驗(yàn)矩陣的構(gòu)造、編碼算法、基本的譯碼算法、性能分析方法和譯碼算法的初始化問(wèn)題,實(shí)現(xiàn)了基于LU分解的快速編碼;隨后,重點(diǎn)研究了低密度奇偶校驗(yàn)碼高速譯碼器實(shí)現(xiàn)的算法,包括構(gòu)造結(jié)構(gòu)靈活的校驗(yàn)矩陣、復(fù)雜度修正的譯碼算法、全并行結(jié)構(gòu)和邏輯資源復(fù)用,對(duì)它們的優(yōu)缺點(diǎn)和適應(yīng)性進(jìn)行了分析;進(jìn)一步,在研究各種譯碼
2、算法的基礎(chǔ)上,提出了一種改進(jìn)的SingleBP.Based算法,同時(shí)對(duì)各種譯碼算法的復(fù)雜度進(jìn)行了分析,性能進(jìn)行了仿真,結(jié)果表明改進(jìn)的SingleBP—Based算法只要選擇合適的參數(shù),在減少?gòu)?fù)雜的情況下,可以獲得接近BP.Based算法的性能,更適合于硬件實(shí)現(xiàn);最后,本文給出了準(zhǔn)循環(huán)低密度奇偶校驗(yàn)碼高速譯碼器的設(shè)計(jì)方案,它以日矩陣的Shift變換為基礎(chǔ),采用改進(jìn)的SingleBP.Based算法,最大迭代次數(shù)20次,并在軟件平臺(tái)上進(jìn)行了仿真。關(guān)鍵宇:低密度奇偶校驗(yàn)碼準(zhǔn)循環(huán)譯碼器高速實(shí)現(xiàn)ABSTRACTLow-DensityPari
3、ty-CheckCodeisakindofchannelcodewithnearShannonperformance,whichCanachieveoutstandingperformanceevenundertheextremelylowsingaltonoiseratio.MoreandmoreapplicationsbegintouseLDPCcode.High-speeddatatransferisakeytechnologyinthefuturecommunicationsystems.Thispaperfirstbri
4、eflyintroducestheLDPCcode,includingthehistoricaldevelopment,themerit,thepresentsituation,theclassification,theconstructionofvalidationmatrix,theencodingalgorithm,thebasicdecodingalgorithm,theperformanceanalysismethodandtheinitializationquestionofdecodingalgorithm,andr
5、ealizesthefastcodingbasedonLUdecomposition.Then,thispaperfocusesonthealgorithmwhichisrealizedontheLDPChighspeeddecoder,includingtheconstructionoftheflexiblestructurecalibrationmatrix,thedecodingalgorithmwhoseorderofcomplexityiSrevised,thefull.parallelarchitectureandth
6、elogicalresourcemultiplying,andcarriesonanalysistotheadvantages;andmrther,basedonvariousdecodingalgorithm,thispaperproposesallimprovedSingleBP—Basedalgorithmandanalyzessimultaneouslythecomplexityofthevariousdecodingalgorithms.Throughsimulation,theresultsshowstheperfor
7、manceoftheimprovedSingleBP.BasedalgorithmcallgetclosetotheperformanceofBP-Basedalgorithmforaslongaschoosessuitableparametersandreducescomplexsituation,anditismoresuitabletobeimplementedforhardware.Finally,thispapergivesthedesignproposaloftheaccuratecirculationlowdensi
8、typaritycheckcodehighspeeddecoder,ittakesimprovedSingleBP-BasedalgorithmbasedonShifttransformationofmatrixH,andthelargestnum