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1、IEEETRANSACTIONSONCOMMUNICATIONS,VOL.53,NO.2,FEBRUARY2005209TransactionsLetters________________________________________________________________ShuffledIterativeDecodingJuntanZhangandMarcP.C.Fossorier,SeniorMember,IEEEAbstract—Shuffledversionsofiterativedecodingoflow-densityt
2、wodifferentangles,andeventually,achievesimilargains.Theparity-checkcodesandturbocodesarepresented.Theproposedverticalschedulingproposedinthisletterisanalgorithmicap-schemeshaveaboutthesamecomputationalcomplexityastheproachintendedtospeedupBPdecodingatnocostincom-standardve
3、rsions,andconvergefaster.Simulationsshowthatplexity.Forvery-large-scaleintegration(VLSI)considerations,thenewschedulesofferbetterperformance/complexitytradeoffs,especiallywhenthemaximumnumberofiterationshastoremaingroupsareintroducedtopreservesomeparalleladvantagesofsmall.
4、BPdecoding.Thehorizontalschedulingof[6]and[7]isahard-wareapproachintendedtoserializethetotallyparallelBPde-IndexTerms—Beliefpropagation(BP),iterativedecoding,low-densityparity-check(LDPC)codes,scheduling,turbocodes.coding.Intheserialization,newupdatesbecomeavailableatthesa
5、meiteration,andspeedupisalsoachievedbyusingthem.I.INTRODUCTIONII.ITERATIVEDECODINGOFLDPCCODESTERATIVEdecodingbasedonbeliefpropagation(BP)[1]AregularbinaryLDPCcodeoflengthandIhasreceivedsignificantattentionrecently,mostlyduetoitsdimensionhasaparity-checkmatrix,withnear-Shann
6、on-limiterrorperformanceforthedecodingoflow-onesineachcolumnandonesineachrow.Wedenotethesetdensityparity-check(LDPC)codes[2]andturbocodes[3].Likeofbitsthatparticipateincheckby,themaximumaposteriori(MAP)probabilitydecodingschemeandthesetofchecksinwhichbitparticipatesas[4],i
7、tisasymbol-by-symbolsoft-in/soft-outdecodingalgo-.Assumeacodewordrithm.ItprocessesthereceivedsymbolsrecursivelytoimproveistransmittedoveranadditivewhiteGaussiannoise(AWGN)thereliabilityofeachsymbolbasedonconstraintsthatspecifychannelwithzeromeanandvarianceusingbinaryphase-
8、thecode.Inthefirstiteration,thedecoderonlyusesthechannelshiftkeying(BPSK)signaling,andletb
