4、mation thetransmissionrate oftheshortwavecommunication. Inordertoreducethe widebandHFchannel, multipath phenomenonisveryserious,largedelay, Dopplerfrequencyshift and fading influencefactorsonthe biterrorrateofthe communicationsystem, the highreliabilityof LPDCcodesaschannel coding.
5、 Thispapermainly carriesonthesimulationoftheexisting communicationsystem in LDPCcode, do comparativestudy, find theappropriate paritycheckmatrix,obtained a suitable widebandHFcommunicationsystem in LDPCcode.Keywords:Shortwavecommunicationsystem,LDPCcode,MATLABII目录摘 要IABSTRACTII目录1