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基于Turbo码的非理想中继协作性能研究.docx

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基于Turbo码的非理想中继协作性能研究 Abstract Cooperativecommunicationisaneffectivewaytoimprovethetransmissionperformanceinwirelesscommunicationnetworks.However,inpracticalscenarios,therelaychannelsoftensufferfromnon-idealconditionssuchasfading,interference,andnoise.Inthispaper,westudytheperformanceofcooperativecommunicationusingTurbocodesundernon-idealrelayconditions.OursimulationresultsshowthatTurbocodescansignificantlyimprovethetransmissionperformanceofcooperativecommunicationundernon-idealrelayconditions. Introduction Thedeploymentofrelaynodesinwirelesscommunicationnetworkshasbecomeapopularapproachforextendingnetworkcoverageandimprovingtransmissionperformance.Incooperativecommunication,relaynodescanhelpthesourcenodetotransmitthedatatothedestinationnodebyrelayingthedatatothedestinationnode.However,therelaychannelsoftensufferfromnon-idealconditionssuchasfading,interference,andnoise,whichmaysignificantlydegradethetransmissionperformance. Turbocodeisapowerfulerrorcorrectioncodethathasbeenwidelyusedinwirelesscommunicationsystems.Thecodecanachievegooderrorcorrectionperformancewithlowcomplexity.Inthispaper,westudytheperformanceofcooperativecommunicationusingTurbocodesundernon-idealrelayconditions. SystemModel Weconsideracooperativecommunicationsystemwithonesourcenode,onedestinationnode,andonerelaynode.Thesourcenodetransmitsthedatatotherelaynode,andtherelaynoderelaysthedatatothedestinationnode.Weassumethatallnodesareequippedwithasingleantenna. ThechannelbetweenthesourcenodeandtherelaynodeismodeledasaRayleighfadingchannelwithadditivewhiteGaussiannoise(AWGN).ThechannelbetweentherelaynodeandthedestinationnodeisalsomodeledasaRayleighfadingchannelwithAWGN.Thechannelcoefficientsareassumedtobeconstantduringthetransmissionofonedatapacket. Inthispaper,weuseTurbocodestoperformerrorcorrectioninthecooperativecommunicationsystem.TheTurbocodeconsistsoftworecursivesystematicconvolutional(RSC)codesconnectedwithaninterleaver.TheTurbodecoderusesaniterativealgorithmtodecodethereceiveddataanditerativelyex