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异构蜂窝网络中基于能效的非正交多址接入下行功率分配算法.docx

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异构蜂窝网络中基于能效的非正交多址接入下行功率分配算法 Abstract: Heterogeneouscellularnetworks(HetNets)haveemergedasapromisingsolutiontocopewiththeexplosivegrowthofmobiledatatraffic.InHetNets,differenttypesofbasestations,suchasmacrocellsandsmallcells,aredeployedtoprovideenhancedcoverageandcapacity.Non-orthogonalmultipleaccess(NOMA)hasgainedsignificantattentionasapotentialaccessschemeforHetNetsduetoitssuperiorspectralefficiency.However,thedownlinkpowerallocationprobleminNOMA-basedHetNetsremainsachallengingtask.Thispaperproposesanenergy-efficientdownlinkpowerallocationalgorithmforNOMA-basedHetNets,aimingtominimizethetotalpowerconsumptionwhilesatisfyingthequalityofservice(QoS)requirementsofusers. 1.Introduction: Withthecontinuousincreaseinmobiledatatraffic,traditionalcellularnetworksarefacingchallengesintermsofcapacityandcoverage.HetNets,whichleveragedifferenttypesofbasestations,havebeenintroducedtomeettheever-growingdemandforwirelesscommunication.InHetNets,smallcellsaredeployedtoenhancecapacityandcoverageindenseurbanareas,whilemacrocellsareusedtoprovidebroadcoverageinruralareas.NOMA,asapromisingaccessscheme,allowsmultipleuserstosharethesametime-frequencyresource,leadingtoasignificantgaininspectralefficiency. 2.LiteratureReview: SeveralpowerallocationalgorithmshavebeenproposedintheliteratureforNOMA-basedHetNets.Thesealgorithmsaimtooptimizedifferentobjectives,suchasspectralefficiency,systemcapacity,andpowerconsumption.However,manyofthesealgorithmsoverlooktheenergyefficiencyaspect,whichiscrucialforsustainablewirelessnetworks.Inthispaper,wefocusondevelopinganenergy-efficientpowerallocationalgorithmfordownlinkNOMAtransmissions. 3.DesignofthePowerAllocationAlgorithm: TheproposedpowerallocationalgorithmtakesintoaccountboththeQoSrequirementsoftheusersandtheenergyefficiencyobjective.Firstly,thealgorithmestimatesthechannelconditionsoftheuserstodeterminetheappropriatepowerlevelsforeachuser.Then,basedontheestimatedchannelconditions,thealgorithmallocatestheavailablepowerresourcestotheuserswhileconsideringth