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NOMA与SCMA非正交多址接入系统仿真分析
Title:SimulationAnalysisofNOMAandSCMANon-OrthogonalMultipleAccessSystems
Abstract:
Withtheincreasingdemandforwirelesscommunication,efficientandreliablemultipleaccesstechnologiesarecrucialforimprovingthecapacityandperformanceofcommunicationsystems.Non-orthogonalmultipleaccess(NOMA)andsparsecodemultipleaccess(SCMA)aretwopromisingtechniquesthatcanaddressthelimitationsoftraditionalorthogonalmultipleaccessschemes.ThispaperaimstoprovideacomprehensivesimulationanalysisofNOMAandSCMA,assessingtheirperformance,advantages,andlimitationsinvariousscenarios.
1.Introduction
Multipleaccesstechnologiesplayacriticalroleinwirelesscommunicationsystemsbyenablingmultipleuserstosharethesamefrequencyresources.Thetraditionalorthogonalmultipleaccessschemes,suchastimedivisionmultipleaccess(TDMA)andfrequencydivisionmultipleaccess(FDMA),sufferfromlimitedspectralefficiencyandsuboptimalperformanceinthepresenceofalargenumberofusers.NOMAandSCMAarenovelnon-orthogonalmultipleaccesstechniquesthataimtoovercometheselimitationsandprovideenhancedperformance.
2.Non-OrthogonalMultipleAccess(NOMA)
2.1PrinciplesofNOMA
NOMAisamultiuseraccesstechniquethatallowsmultipleuserstosharethesametimeandfrequencyresourcesnon-orthogonally.InNOMA,powerdomainandcodedomainmultiplexingareusedtoseparatedifferentusers'signals.Userswithdifferentchannelconditionsareallocateddifferentpowerlevels,andtheirsignalsaresuperimposedanddecodedatthereceiverusingsuccessiveinterferencecancellation(SIC)techniques.
2.2PerformanceEvaluation
ThissectionpresentsthesimulationresultsevaluatingtheperformanceofNOMAintermsofspectralefficiency,systemcapacity,andbiterrorrate(BER).Theeffectsofdifferentuserdistributions,powerallocationstrategies,andchannelconditionsareanalyzed.
3.SparseCodeMultipleAccess(SCMA)
3.1PrinciplesofSCMA
SCMAisanemergingnon-orthogonalmultipleaccessschemethatemployssparsecodebookstoenablemultipleuserstosharethesametimeandfrequencyresourcesefficiently.SCMAusesmultidimensionalmodulationschemesandsparsecodebook