基于滑动窗译码的不规则原模图LDPC卷积码的构造

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1、第26卷第1期重庆邮电大学学报(自然科学版)Vol．26No．12014年2月JournalofChongqingUniversityofPostsandTelecommunications(NaturalScienceEdition)Feb．2014DOI:10．3979/j．issn．1673-825X．2014．01．013Constructionofirregularprotograph-basedLDPCconvolutionalcodeswithwindoweddecoding12LIULintao，LVYibo(1．KeyLabofMobileCommun

2、icationinChongqing，ChongqingUniversityofPostsandTelecommunications，Chongqing400065，P．Ｒ．China;2．Dept．ofElectronicEngineering，XiamenUniversity，Xiamen361005，P．Ｒ．China)Abstract:Latencyisanimportantindicatorformoderncommunicationsystems．Thewindoweddecodingschemeexhibitsgoodperformancewithredu

3、cedlatency．Inthispaper，aconstructionschemeforirregularprotograph-basedlow-densitypar-ity-check(LDPC)convolutionalcodeswithwindoweddecodingisproposed．Theprotograph-EXIT(P-EXIT)analysisfortheaccumulate-repeat-by-4-jagged-accumulate(AＲ4JA)-basedLDPCconvolutionalcodesovertheadditivewhiteGaus

4、siannoise(AWGN)channelshowsthatthisflexibleconstructiontechniquecangiverisetotheLDPCconvolutionalcodeswithdifferentcoderatesandthresholdsclosetocapacity，forbothBPdecodingandwindoweddecoding．Thecomputersimula-tionsidentifytheAＲ4JA-basedLDPCconvolutionalcodesoutperformtheregularLDPCconvolu

5、tionalcodesandtheAＲ4JA-basedLDPCconvolutionalcodesexhibitgoodperformancewithatleast56．7%reducedlatency．Combiningtheproposedconstructionschemeforirregularprotograph-basedLDPCconvolutionalcodesandthewindoweddecodingschemecanpro-videanefficientwaytotrade-offthedecodinglatencyandthecodeperfo

6、rmance．Keywords:low-densityparity-check(LDPC);convolutionalcodes，protograph;windoweddecoding;beliefpropagation;thresholds;additivewhiteGaussiannoise(AWGN)channelCLCnumber:TN911．23Documentcode:AArticleID:1673-825X(2014)01-0074-07基于滑动窗译码的不规则原模图LDPC卷积码的构造12刘林涛，吕毅博(1．重庆邮电大学重庆市移动通信重点实验室，重庆400

7、065;2．厦门大学电子工程系，福建厦门361005)摘要:时延是现代通信系统的一个重要指标。滑动窗译码能够在保证性能的基础上降低时延。基于滑动窗译码提出了一种不规则原模图低密度奇偶校验(lowdensityparitycheck，LDPC)卷积码的构造方法。通过对基于AＲ4JA(accumulate-repeat-by-4-jagged-accumulate)的LDPC卷积码在AWGN(additivewhiteGaussiannoise)信道下的P-EX-IT性能分析发现，利用这种构造方式能够设计出多码率并且在BP译码和滑动窗译码方式