移動(dòng)通信系統(tǒng)中的干擾抑制技術(shù).pdf

1、ff772467梗旦大學(xué)學(xué)校代碼：學(xué)號(hào)：碩士學(xué)位論文移動(dòng)通信系統(tǒng)中的干擾抑制技術(shù)院系(所)：信：盛型堂皇王猩堂院1日!墜I苴士=!士I圭士匹專姓業(yè)：垣籃當(dāng)信息丕統(tǒng)名：縫互勇指導(dǎo)教師：王塞筮數(shù)援宋經(jīng)體囂、耳孵島患勿I=生爻公布1024602202lll9———————————————————__——————_——————————————————__————_●————————————●———一?！居⑽恼緼bstractInthisth

2、esis，interferencesuppressiontechnologyinthemobilecommunicationsystemisinvestigatedmainlyintwoaspects：Oneisthemultiuserdetectiontechnology；theotheristhesmartantennatechnologyInaddition，theestimationalgorithmofpropagationd

3、elayandthedesignofmultipathinterferencecancellerarealsodiscussedFirstlythecodinganddecodingthoughtsofTurbocodeareintroducedtoillustratetheprincipleofiterationAndtheniterativemultiuserdetectionwithsoftinterfe：rencecancell

4、ationforcodedCDMAsystemisanalyzedThiskindofmultiuserdetectionisrecognizedasasuccessfulapplicationofTurboprinciple，inwhichthereceiverperformsiterationswiththeexchangeofextrinsicinformation，achievedbyasoft—inputsoftoutput(

5、SISO)multiuserdetectorandabankofsingleuserSISOchanneldecodersAteachiteration，extrinsicinformation，whichreflectsthereliabilityofcodedbits，isextractedfromdetectionanddecodingstagesanddeliveredbyinterleaverandde—interleaver

6、AfterseveraliterationstheturbodecodersmakeharddecisiononthedecodedinformationbitsSecondly，interleavedivisionmultiple—access(IDMA)systemisintroduced，whichischaracterizedbythefactthatalltheusersaredistinguishedbydifferentc

7、hip—levelinterleavingmethodsinsteadofspreadingsignaturesasintheconventionalCDMAschemeBasedontheiterationprincipleofTurbocode，twoiterativemultiuserdetectionreceiverstructuresareproposedinthispaperforIDMAsystems：oneistheit

8、erativemultiuserdetectionbasedoninterleaveinQAMmodulationsystems；theotheristhejointiterativechannelestimationandmultiuserdetectionbasedoninterleaveinMIMOsystems，inwhichnormalizedcalculationcomplexityperbitperuserperitera

9、tionisindependentofthenumberofusers，Simulationresultsshowthat，comparedwithCDMAsystems，theproposedmultiuserdetectionschemesachievebothlowerbiterrorratcandlowercomplexityThirdlytheapplicationofsmartantennainthemobilecommun

10、icationsystemisstudiedAkindofoptimizedalgorithmfortheweightofmultiplebeamsmartantennaintheGSMsystemisproposed；andasectorestimationalgorithmusingswitchingbeamsmartantennaisproposedforCDMAsystemAtlast，akindofnewestimationa