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7MIMO Transmission Control in Fading Channels—A Constrained Markov Decision Process Formulation With Monotone Randomized Policies .pdf

7MIMO Transmission Control in Fading Channels—A Constrained Markov Decision Process Formulation With Monotone Randomized Policies .pdf

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时间：2019-03-08

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1、IEEETRANSACTIONSONSIGNALPROCESSING,VOL.55,NO.10,OCTOBER20075069MIMOTransmissionControlinFadingChannelsAConstrainedMarkovDecisionProcessFormulationWithMonotoneRandomizedPoliciesDejanV.DjoninandVikramKrishnamurthy,Fellow,IEEEAbstract—ThispaperaddressestheoptimalpowerandrateSeveralrecentpape

2、rsdiscusstheproblemoftransmissionallocationcontrolinmultiple-inputmultiple-output(MIMO)controlwiththeobjectiveofaveragepowerorbit-errorratewirelesssystemsoverMarkovianfadingchannels.Theproblem(BER)minimizationunderthelatencyconstraints.Amongisposedasaninfinitehorizonaverage-costconstrained

3、Markovotherresults,[5]and[6]addressthepowerandrateadapta-decisionprocess(CMDP)withthegoalofminimizingtheav-eragetransmissionpowersubjecttodelayconstraints.Byusingtionwithdelayconstraintandreal-timeincomingtrafficforaLagrangianformulationoftheCMDP,weusetheconceptsofsingle-usersingle-channel

4、systems,while[7]addressesthestochasticdominance,submodularity,andmultimodularitytoissueofrateadaptationfororthogonal-frequency-division-mul-provethattheoptimalrandomizedpoliciesaremonotone.Threetiplexing(OFDM)systemswithdelayconstraint.Asimilarimportantstructuralresultsonthenatureoftheopt

5、imalran-poweradaptationmodelunderadeadlineconstraintonthedomizedpoliciesarederived.First,weshowthattheactionspacepackettransmissionhasbeenaddressedin[8].In[9],structuralcanbeexponentiallyreducedbydecomposingtherateallocationproblemintobit-loadingproblemacrossindividualantennasandresultsar

6、eobtainedforapartiallyobservedMarkovdecisionthetotalrateallocationbasedonthecurrentbufferoccupancyprocessformulationofthetransmissioncontrolproblem.andchannelstate.Second,weshowthattheoptimalrateallo-Themodelof[5]isextendedin[10],anditisshown,undercationpolicyisarandomizedmixtureoftwopure

7、policiesthattheassumptionthatbothincomingtrafficandbufferoccupancyaremonotonicallyincreasinginthebufferoccupancy.Finally,weiscontinuous,thattheoptimalpowerversusdelayregionisshowthattheoptimalpowerallocationispiecewiselinearinthedelayconstraint.Thesethreestructuralre

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