协同通信与AF和DF中继协议

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1、AbstractNowadays,thereisatrendforcommunicationsystemthatthewholenetworksystemisbecomingdynamicsothattherearealwayshavingdevicesshouldbeembeddedandremoved.Conventionalwiredcommunication,duetothecomplexityofcabling,doesnotadapttothemoderncommunicationsystem.Wire

2、lesstechniquehasbeenusedwidelybecausedevicescanbeconnectedbyelectromagnetismwavewithoutcabling.However,lowtransmittingreliablitybecauseofinter-interferencebetweenelectromagnetismwavesisthekeyproblemofwirelesscommunication.Basedonthis,thisthesisinvestigatesoneo

3、fthetechniquecalledcooperativecommunicationanditcooperativeprotocols.Cooperativecommunicationisavirtualmultiple-inputmultiple-output(MIMO)system.Toincreasethereliabilityofsignaltransmittedwithoutincreasingtheamountofcommunicationdevices,thistechnologytriestoma

4、keeachantennashaveoneormorepartnersthatassistthemtotransmitthesignal.Inwirelessnetwork,thedevicesnotonlytransmittheirownsignalbutalsoassisttheir“partner”totransmittheirsignalforsavingthecostofinstallationofadditionalantennasatbothreceiverandsenderInthisthesis,

5、wefocusonintroducingthreemainprotocolsincooperativecommunication:Amplify-and–Forward(AF),Decode-and-Forward(DF)andCodedCooperation(CC).TheperformanceandmathematicalequationsofAFandDFareanalysed,andthenMATLABprogramswerecreatedtosimulatetheperformanceofthesetwo

6、protocols.Aboutthethreeprotocols,themainproceduresarealsointroduced.TheperformancecomparisonforAFandDFindifferentsignal-to-noise(SNR)aredemonstrated.TheresultpresentsthattheDFprotocolshasbetterperformancethanAF.Finally,somerecommendationsandfutureworkarementio

7、nedattheendofthethesis.38TableofContentsAbstractTableofcontainsListoffiguresListofabbreviationsandSymbols1Introduction..................................................................................................................................91.1Backgrou

8、nd.......................................................................................................................91.2Objectives.............................................