基于概率计算的多码率ldpc译码器设计

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1、ABSTRACTABSTRACTTheLCPCisonetypeofthelinearblockcodes,whichhassparseparitycheckmatrix.LDPCwasreintroducedinthe1990sandshowtheexcellentperformancewhichclosetotheShannonlimitation.Thus,theLDPCquicklybecameoneofthehotresearchareasinacademicandindustryfields.Alotofrese

2、archresultshavebeachieved.LDPCisadoptedasthechannelcodingschemeforseveralstandards,includingDVB_S2,CMMB,WiMAX(IEEE802.16e)and10GEthernet(IEEE802.3an).ThedecodingalgorithmisanimportantissueforLDCPresearchrecently.WhenGallagerfirstproposedtheLDPCcodesin1962,thedecodi

3、ngalgorithmdidnotdrawntheworld'sattentionforaverylongperiodoftimebecauseofthehighhardwarecomplexity.WiththedevelopmentofVLSItechnologyanddecodingalgorithm,theLDPCdecodereventuallycanbeimplementedinhardwareandattractpeople’sattentiontoitssuperiorperformance.Thefocus

4、ofthisstudyisthedecodingalgorithmoftheLDPCwithstochasticcomputationmethod,whichhasadvantagesoffastdecodingspeed,simplehardwarestructure.Thus,theparallelarchitecturecanbeachievedefficiently.Inthispaper,weachievemulti-rateLDPCdecodingmodulebasedonstochasticcomputatio

5、nmethod.Themainworkandinnovationsofthisthesisarelistedasfollowing:1.Weconstructaparitycheckmatrixconsistsofthreedifferentbitrate.Thehardwarestructureofthedecoderisdefinedbythemaximumbitrate.Themultipleratedecodingcanbeachievedbyhardwareconfiguration.Soit’sconvenien

6、ttochoosethemostsuitablerateaccordingtotheSNRofthechannel.2.WeapplyHalf-Broadcastingtechnologyindecoderarchitecuredesigntoreducethecomplexityoftheconnectionbetweenthechecknodesandvariablenodes.Thus,criticalpathofthehardwarestructurewiththistechnologycanalsobereduce

7、dtoimprovethethroughputofthesystem.3.Accordingtotheperformancedegradationcuasedbythechecknodedegreewithhighbiterates，wechangetheconnectionstructureattheoutputofthechecknodeandthewayofinformationtransmisiontoachievehighperformance.ThismethodalsocanII万方数据ABSTRACTredu

8、cethehardwareatthechecknodesandtheerrorbitspreadingamongthenodes。4.Afterestablishingthehardwareandsoftwaresystem，weusesimulationtoanalysisandveri