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1、東南大學碩士學位論文基于802.16e的信道編解碼技術研究姓名：王皓申請學位級別：碩士專業(yè)：通信與信息系統(tǒng)指導教師：衡偉20090226AbstractAbstractChannelcodingisoneofmeanstoenhancethereliabilityofdigitalcommunicationsAsamemberofchannelcoding，LDPCcodeshavebeenthemainsubjectofmanyres

2、earchactivitiesfortheirimpressivenearShannonlimiterrorcorrectingperformancesincetheirdiscoveryLDPCcodesareakindofspecialLinearBlockcodes，themostimportantcharacteristicofitisitsparitycheckmatrixisdefinedbyaverysparsematri

3、xwhichistheultimatereasonmakeittakeonsuchexcellentperformanceLDPCcodeshavereceivedmoreandmoreattentionfromfieldofmobilecommunicationbecauseoftheirexcellentperformanceThenitbecomealloptionalchannelcodeplanofIEEE80216estan

4、dardMoreoverthestandarddefinestherelevantLDPCcodeswithdifferentlengthandrateUndertheresearchbackgroundoftheIEEE80216estandard，withtheaimofstudyingtherelevantperformancesbasedontheIEEE80216estandard。SLDPCcodesthisdisserta

5、tionsimplyintroducesthesystemmodelandsomekeytechniquesoftheIEEE80216estandardthendiscussesthebasetheoryandtheencodingprinciplesofLDPCcode，analysesakindofencodingalgorithmwhichextremelyadaptstotheLDPCcodesdefinedbyIEEE802

6、16estandard，provesitCanavailablysimplifythewholeencodingprocessandadvancetheencodingefficiencybasedonthetheoryInadditionwepresenttheacademicfoundationanddeductionprocessoftheLDPCdecodingalgorithmEspeciallywemakesomeimpro

7、vementsandresearchaimatthecalculationmethodofLDPCdecodingsoRbitmetricintheLDPCOFDMsystem，applyakindofsoftbitmatricalgorithmwhichisfoundonthedistancecharacteristicontheLDPCcodesde緬edbyIEEES0216esimplifythedecodingalgorith

8、mandtestifyitcanstilltakeonthepreferabledecodingperformancebysimulationexperimentsatthesametimeFinallywemakelotsofsimulationexperimentsontheaspectsofdecodingalgorithm，iterativetimesandtheparameterselectionoftheOffsetMinS

9、umdecodingalgorithmbasedonseveralkindsofLDPCcodesdefinedbyIEEE80216estandardInconclusionwefixonakindofthemostexcellentdecodingalgorithmwhichtakesonaoutstandingbalanceperformanceontheaspectsofdecodingcapabilitydecodingspe

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