基于.能量收集的ofdma系统的资源分配机制的研究

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1、万方数据AbstractWiththedevelopmentofrenewableenergyaswellastheincreasingdemandforwirelesscommunicationbusiness,therehasbeenagrowinginterestinthecombinationbetweenenergyharvestingandwirelesscommunicationsystems.Buttherearemanynewchallengesforresourceallocati

2、oninenergyharvestingcommunicationsystems,duetouncertaintiesoftheenergyharvestprocessandtime-varyingcharacteristicsofthechannelgain.Giventhis,westudysubcarrierandpowerallocationalgorithmforenergy-efficientcommunicationinanorthogonalfrequencydivisionmulti

3、pleaccess(OFDMA)downlinknetworkwithenergyharvestingbasestation(BS).Specifically,anenergyharvesterandaconstantenergysourceareusedforsupplyingtheenergyrequiredforsystemoperation.Inthispaper,tomaximizethelong-termsystemenergyefficiency,weformulatethemulti-

4、userwirelesstransmissionproblemasamultiuserMarkovdecisionprocess(MUMDP)byexplicitlymodelingthedynamicenergycollectioncharacteristicsandtime-varyingchannelconditions.Inordertoreducealgorithmcomplexity,weproposeanovelonlinelearningalgorithmbasedonMDPmodel

5、forpowerandsubcarrierallocation，tomaximizethelong-termenergyefficiency.Consideringfairnessamongusers，weproposeapowerandsubcarrierallocationmechanisminOFDMAdownlinknetworkwithenergyharvestingbasestationtoimprovethesystemoverallthroughputundertheproportio

6、nalfairnessconstrain.Wedecomposethepowerandsubcarrierallocationproblemintotwosub-problemstoreducethecomplexity,andweproposetheimprovedgeneticalgorithmandcentralizedalgorithmoneachpowerandsubcarrierallocation,tomaximizethesystemoverallthroughputunderthep

7、roportionalfairnessconstrain.Keywords:EnergyharvestingOFDMAsystemResourceallocationOptimizationalgorithmProportionalfairnessOnlinelearning万方数据万方数据目录第一章绪论....................................................................................................

8、.................11.1研究背景及意义................................................................................................11.2国内外研究现状..............................................................................................