非正交多址系统中基于Raptor码的下行传输设计与优化-豆柴文库

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非正交多址系统中基于Raptor码的下行传输设计与优化
Title:DesignandOptimizationofDownlinkTransmissioninNon-OrthogonalMultipleAccessSystemsbasedonRaptorCodes
Abstract:
Non-OrthogonalMultipleAccess(NOMA)hasemergedasapromisingtechnologyforenhancingthespectrumefficiencyandsystemcapacityinnext-generationwirelesscommunicationsystems.However,theimplementationchallengesinNOMAsystems,suchasmulti-userinterference,demandefficienterrorcontrolmechanisms.ThispaperfocusesonthedesignandoptimizationofdownlinktransmissioninNOMAsystemsusingRaptorcodes.Raptorcodes,knownfortheirsuperiorerasurecorrectioncapabilities,areutilizedtoenhancethereliabilityandefficiencyofdownlinktransmissions.TheaimofthisresearchistoinvestigatetheperformanceofRaptorcodesinNOMAsystemsandoptimizevarioussystemparametersformaximizingtheoverallsystemperformance.
1.Introduction:
Theexponentialgrowthofwirelesscommunicationserviceshasledtoashortageofavailablespectrum.Consequently,newtechnologiesarerequiredtocopewiththeever-increasingdemandforhighdataratesandimprovednetworkcapacity.Non-orthogonalmultipleaccess(NOMA)hasbeenintroducedasapromisingsolutionthatenablesmultipleuserstosharethesamefrequencyresource,simultaneouslyandnon-orthogonally.Byallocatingdifferentpowerlevelsandusingadvancedinterferencecancellationtechniques,NOMAofferssignificantimprovementsinspectralefficiencyandoverallsystemcapacity.
2.RaptorCodes:
Raptorcodesareaclassofforwarderrorcorrectioncodesthatareparticularlysuitableforerasurechannels,wherebitsarelostwithhighprobabilities.Thesecodesofferseveraladvantagesovertraditionalerrorcorrectioncodes,includinghighdecodingefficiency,lowcomplexity,andtheabilitytooperateneartheShannonlimit.RaptorcodesarebasedonFountaincodes,whichgenerateredundantsymbolsfromasetofsourcesymbols.Theredundantsymbolsarethentransmittedoverthechannel,allowingthereceivertoreconstructtheoriginalmessageevenifsomesymbolsarelost.
3.DownlinkTransmissionDesign:
Indownlinktransmission,thebasestation(BS)sendsdatatomultipleuserssimultaneously.InaNOMAsystem,theBSallocate