基于OFDM的IDMA系统仿真研究

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1、西南交通大学硕士学位论文基于OFDM的IDMA系统仿真研究姓名：栾帅申请学位级别：硕士专业：通信与信息系统指导教师：陈红20070501西南交通大学硕士研究生学位论文第n页AbstractMuRiple-aceessisOllCofthekeytechniquesofwirelesscommunication,andevenallimportantsignofmobilecommunicationgenerationalchanges．TheCOrecontentishowtoinciseanddistributelimitedcommunicat

2、ionresourcesamongmulti-users,thosewhocansharethereSOUrCeSwithoutinterferingoneanother．Alongwiththedemandsofunsymmetricalbusiness,variableratebusinessandOoS，thesignificanceofmultiple-accesstechniqueisbecominghigherthusdrawsmoreandmoreresearchinterests．BasedonCodeDivisionMultipl

3、eAccess(CDMA)，LiPingandhiserewhaveproposedInterleaveDivisionMultipleAccess(IDMA)whichdistinguishesmniti-usersthroughchiplevelinterleavingmethods．Thisideanotonlyinheritsmanyadvantagesfromtheformerbutalsoreducescomplexity,isanewmultiple-accessmethodwithwideforeground．OFDM，namely

4、oRhogonalfrequencydivisionmultiplex,transmitsinformationbymultipleorthogonalcarriers．／tbecomesresearchhotspotduetohighsystemcapacitywithlowISIandnarrow-bandinterference．OFDMisconsideredtobeoneofthecoretechniquesof4Gmobilecommunication,isanidealmodulatingtechnologywhichadaptsto

5、multimediacenteredwirelesswide-bandhighspeeddatatransmission．ResearchonthecombinationofOFDMandnewmultiple-accessmethodsisverysignificanttowardsfutureevolutionofmobilecommunicationtechniques．Thisdissertationfirstlysummarizesresearchstatusofcorrelatetechniquesbothdomesticandover

6、seas，andthenintroducesthefundamentalprincipleandimplementationofIDMA．The1DMAsystemmodelispresentedwithexplanationfortransmitterandreceiverrespectively．Thechip-by-chipiterativemulti—userdetectionisexpatiatedwithemphasisonelementsignalestimatetyEsE)algorithmandimplementation．The

7、influenceofmainparameterssuchasspreadinglengthanditerationtimetosystemperformancearecomparedbysimulation．Onthefoundationabove,anOFDMbasedIDMAsystemmodelisconstructed．Thetransmitterandreceiverstructuresaleintroducedtogetherwithcorresponding西南交通大学硕士研究生学位论文第m页multi·tlscrdetection

8、method．Simulationisdonetoinvestigatethebitetrot-rate(BER)perf