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OFDMA系统中基于伪贝叶斯算法的动态分配随机接人信道策略(英文).docx

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OFDMA系统中基于伪贝叶斯算法的动态分配随机接人信道策略(英文) Abstract: Withthegradualdevelopmentof5Gtechnology,OFDMAhasbecomethemainstreamtechnologyforwirelesscommunication.InordertoimprovetheefficiencyofrandomaccesschannelallocationinOFDMAsystem,thispaperproposesadynamicallocationstrategybasedonpseudoBayesalgorithm.ThisnewstrategycombinestheadvantagesofthetraditionalBayesianalgorithmandthepseudo-Bayesianalgorithm,andcaneffectivelyimprovethechannelutilizationrateandreducethedelayofthesystem. Introduction: Withtherapiddevelopmentofwirelesscommunicationtechnology,thedemandforhigh-speedandefficientwirelessnetworkshasbecomeincreasinglyurgent.OFDMA(OrthogonalFrequencyDivisionMultipleAccess)isapopulartechnologythathasbeenwidelyusedinmobilecommunicationnetworks,Wi-Fi,andotherwirelesscommunicationsystems.OFDMAallowsmultipleuserstosharethesamechannelsimultaneouslyandcanprovidehighspectralefficiency,lowlatency,andhighthroughput. InanOFDMAsystem,therandomaccesschannel(RACH)isresponsibleforallocatingchannelstodifferentusers.Duetotherandomnessanduncertaintyofthesystemenvironment,theRACHallocationstrategyneedstobedynamicandflexible.Inthepast,traditionalBayesianalgorithmshavebeenusedtoallocatechannelsinOFDMAsystems.However,thesealgorithmshavesomelimitations,includinghighcomputationalcomplexityandhighsensitivitytoparametersettings. Toaddresstheseissues,thispaperproposesanewdynamicallocationstrategybasedonthepseudo-Bayesianalgorithm.Thepseudo-BayesianalgorithmisavariantofthestandardBayesianalgorithmthatintroducesanartificialpriorprobabilitydistributiontoavoidoverfitting.BycombiningtheadvantagesofthetraditionalBayesianalgorithmandthepseudo-Bayesianalgorithm,ourproposedstrategycanimprovethechannelutilizationrateandreducethedelayofthesystem. MainContent: Theproposedstrategyconsistsoftwomainsteps:channelestimationandchannelallocation.Inthefirststep,thepseudo-Bayesianalgorithmisusedtoestimatethechannelqualityofeachuser.Specifically,foreachuser,apseudo-countisaddedtothenumberoftimestheuserhasaccessedthechannel.This