1、分類號(hào)TN9145密級(jí)重慶郵電大學(xué)碩士學(xué)位論文論文題目基于LDPC碼的IDMA通信系統(tǒng)性能研究英文題目PerformanceofLDPCCodedIDMASystem碩士研究生矍堯指導(dǎo)教師王鹽熬撞學(xué)科專業(yè)通信與信息系統(tǒng)論文提交日期—2007—430論文答辯日期—2007—66論文評(píng)閱八到光遠(yuǎn)教授西南盤掌陶疊熬撞重慶酆蟲(chóng)盤堂答辯委員會(huì)主席陶洋教授重慶郵電大學(xué)2007年4月20日重慶郵電大學(xué)碩士論文AbstractInrecentyears

2、，IDMAasthekeytechnologyin4“mobilecommunicationhasbeenwildlystudiedIDMAnotonlyinheritsmanyadvantagesfromCDMA，especiallydiversityagainstfading，butalsohassomeownadvantages，suchasasimpleChipbyChipiterativereceiverstructure，h

3、ighspectralefficiencyandexcellentperformanceofmultiuseraccessFormakingitclosertothemultipleaccesschannel(MAC)capacitylimits，LDPCcodesisappliedtoIDMAsystem，andLDPCCodedIDMAsystemispresentedinthispaperThoughcomputersimulat

4、ion，theperformanceofthedesignedsystemhasbeeninvestigatedandanalyzeddeeplyFurthermore，theoptimalLDPCcoderatesofthedesignedsystemhavebeenfoundandLDPC—CodedIDMAsystemiscomparedwithIDMAsystembasedonconvolutionalcodesgenerall

5、yindifferentconditionsSimulationresuItsindicatethatLDPCCodedIDMAsystemnotonlyinheritsmanyadvantagesfromIDMAsystem，butalsohasitsownpredominance，suchasclosertomultipleaccesschannel(MAC)capacitylimits，obtainsmorecodinggains

6、，andsupplieshigherqualitycommunicationserviceFurthermore，themiddleLDPCcoderatesarethebestchoiceforthissystemOverAWGNchannel，performanceofthedesignedsystemwith16usersisabout26dBawayfromtheMACcapacitylimitsatbiterrorrateof

7、10一，and34dBbetterthanthesystembasedonconvolutionalcodes；theoptimalLDPCcoderatesarebetween04and05InfastRayleighfadingchannel，eventhecodinglengthofthedesignedsystemisjust512bits，itstillhas3dBcodinggainsoverthetraditionalco

8、dedsystematbiterrorrateOf10～TheresultsshowthatthedesignedsystemisverysuitableforhighspeedtransmissionoperationandthisworkisofthefarreachingsignificanceinfuturedigitalcommunicationsystemKeywords：InterleaveDivisionMultiple