码率兼容ldpc码的设计与应用

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1、DESIGNANDAPPLICATIONOFRC-LDPCCODESABSTRACTLow-DensityParity-Check(LDPC)codeshavereceivedalotofattentionbecauseofnear-Shannonperformanceandlowdecodingcomputationcomplexity.AstheimprovementofEncodingAlgorithmandDecodingAlgorithm,theimplementationofLDPCCodeshasbec

2、omemoreandmoreeasy.Nowadays,LDPCCodesisbeenusedinDVB-S2、802.16e、802.11nandtheCMMBstandard.However,theimplementationofRate-compatibleLDPCcodesisnotflexibleasthatofTurboCodes,whichisanobstacleoftheapplicationinMobilesystem.Ourresearchistosolvethisproblem.Wefocuso

3、nthestructureofLDPCCodes.ByconstructingtheHMatrixviaPEGAlgorithmandusingthedegreedistributionoptimizedbyEXITChartswithanimprovedstructure,wefoundthatitcanmaketheimplementationofRC-LDPCCodesmoreflexiblewithoutanylossofperformance.Thestructurecanbemodifiedtoimple

4、mentdecomposableRC-LDPC(D-RC-LDPC)Codesbyfartherresearch.TheD-RC-LDPCcanbeusedinaninnovationalHARQSchemetoimprovethethroughputofthesystematlowSNR.TheseimprovementscanpromotetheapplicationofLDPCCodesinMobileSystem.However,howtomakethecodelengthandcoderateflexibl

5、eatanycodelengthisstillabigchallenge.Then,wewillfocusourresearchonthisproblem.KEYWORDS:LDPCCodes,EXITChart,PEGAlgorithm,Rate-Compatible,HARQ符号说明(,)λρ度分布对⊗卷积英文缩略语表AWGNAdditiveWhiteGaussianNoise加性白高斯噪声BECBinaryErasureChannel二进制擦除信道BERBitErrorRate误比特率BPBeliefPropa

6、gation置信传播算法BPSKBinaryPhaseShiftKeying二进制相移键控EXITExtrinsicInformationTransfer外信息转移LDPCLow-DensityParity-Check低密度奇偶校验MSAMin-SumAlgorithm最小和算法RCRate-Compatible码率兼容目录1绪论..........................................................11.1LDPC码的研究背景以及现状...................

7、................11.2本课题研究的意义及研究工作成果..............................22LDPC码的编译码算法............................................32.1LDPC码的基本概念...........................................32.2LDPC码的编码算法...........................................42.2.1传统的编码方法............

8、..............................42.2.2RU算法.................................................52.3LDPC码的译码算法...........................................62.3.1BP算法.................