4、rward morestringentrequirements onthe quality and safety information thetransmissionrate oftheshortwavecommunication. Inordertoreducethe widebandHFchannel, multipath phenomenonisveryserious,largedelay, Dopplerfrequencyshift and fading influencefactorsonthe biterrorrat
5、eofthe communicationsystem, the highreliabilityof LPDCcodesaschannel coding. Thispapermainly carriesonthesimulationoftheexisting communicationsystem in LDPCcode, do comparativestudy, find theappropriate paritycheckmatrix,obtained a suitable widebandHFcommunicationsyst
6、em in LDPCcode.Keywords:Shortwavecommunicationsystem,LDPCcode,MATLABI目录摘 要IABSTRACTII目录1一、绪论1(一)课题研究的背景和意义1(二)本课题研究的热点及发展现状1(三)课题研究内容安排1二、传统短波系统中信道编码的研究与分析4(一)DRM数字广播调幅系统中信道编码的研究4(二)美军短波宽带数据通信标准MIL-STD-188-110C4三、LDPC码简介4(一)LDPC码理论基础4(二)LDPC码的构造4(三)LDPC码的编码原理4(四)LDPC