低密度奇偶校驗(yàn)碼編碼算法的研究.pdf

1、分類號：——UDC：——密級：——編號：——工學(xué)碩士學(xué)位論文低密度奇偶校驗(yàn)碼編碼算法的研究碩士研究生：指導(dǎo)教師：學(xué)位級別：學(xué)科、專業(yè)：所在單位：論文提交日期：論文答辯日期：學(xué)位授予單位：佟寧寧趙旦峰教授工學(xué)碩士通信與信息系統(tǒng)信息與通信工程學(xué)院2008年1月2008年1月哈爾濱工程大學(xué)哈爾濱：[程人學(xué)碩十學(xué)何論文ABSTRACTLDPCcodesisthekeytechnologiesofthefuturebroadbandwireles

2、scommunicationtaisethecommunicationqualityandthedatarateThisthesismainlystudiestheimplementationoftheLDPCcodesinthenarrowbandcommunicationsystemthenarrowbandcommunicationsystemrequiresthattheLDPCcodeswiththeMSKmodulation

3、owntheerrorbitrateBER10‘5intheconditionofsignalnoiserateSNR=2dBBasedontheimplementationbackground，thekeyresearchofthethesisistheschemeoftheLDPCencodingThemainproblemofLDPCimplementationisthehi曲complicationofitscodingTher

4、efore，theaimofLDPCmsearchinthisthesisistomakethecodingcomplicationlowerthroughtheimprovementofcodingschemeandthestructureofparitycheckmatrixFirstly，severalkindsofcodingschemeisstudied，cycliccodesandquasicycliccodesencodi

5、ngalgorithmanditeratealgorithmfinishtheencodinganddeclinetheencodingcomplexitybytakingadvantageoftheinternalcharacteristicssuchasthelowertrianglestructureandquasicyclicstructure，SOtheimprovementalgorithmsofparitycheckmat

6、rixthatthethesispresentsareinaccordancewiththethustwokindsofencodingalgorithmsThen，detailedanalysisofthestructureofparity—checkmatrixispresentedtheemphasisisonseveralkindsoftypicalconstructedalgorithmsofparity—checkmatri

7、x，andpresemsthreekindsofimprovedconstructedalgorithmsofparitycheckmatrix，whichhasstrongabilityofcorrecterrors，simpleencodingstructure，andiseasytoimplementFinallybasedontheimplementationbackground，inthelightoftheexpecttar