ofdm系统自适应资源分配跨层的研究

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1、西南交通大学硕士研究生学位论文第1I页AbstractMulti—carrierOFDM(OrthogonalFrequencyDivisionMultiplexing)isselectedasakeytechnologyofLTEsystemforitsabilitytoovercomemultipathfading．Meanwhile，OFDMCanbebettercombinedwiththelinkadaptationtorealizethesystemcapacity’Senhancementthroughfullyunearthingthesystemt

2、ime—frequencyresources．Thelayeredresourceallocationschemeincreasesperformanceofone-layerunderthefoundationofoptimizingeachlayer,butitcannotimproveperformanceofoverallsystem．Throughconsideringthecoupleramonglayer,cross—layerdesigncombinestheintersectedlayerinanetworkasawholetooptimize，s

3、othatitCanentirelypromotethesystemperformance．Therefore，studyingthecross-layerresourceallocationforOFDMsystemhaslargersignificanceinpractice．AlayeredresourceallocationalgorithmbasedontheLTEsystemisproposed，whileintroducesbasicstructureandrelatedkeytechnologiesofLTEsystem．Onthatbasis，fi

4、rstly,theimportanceofcross--layerdesignisdiscussedandthestructurechartofcross·-layerresourceallocationisgivedforLTEdownlinkOFDMsystem．Secondly,theprocessofcross-layerresourceallocationisanalysed，andthen，theusertransmissionspeedconstraintandthepriorityfunctionofdifferenttypesoftrafficar

5、ederived．Finally,aQoS-guaranteedcross—layerresourceallocationstrategyisproposedforOFDMsystem，whichrealizestheinteractionofinformationamonglayerinanetworkaswellasensuresthevalidityandreliabilityofnetworktransmissionbytakingwirelesschannel’Stime-variablecharacteristicatphysicallayer,user

6、bufferqueue’SinherentdynamiccharacteristicatMAClayer,trafficarrival’Srandomnessatapplicationlayeranduser’Sfaimessundertheapplicationofmultiuserdiversityintoaccountinschedulingandresourceallocation．SimulationresultsindicatethattheproposedalgorithmCaneffectivelyreducetheoverallsystemlate

7、ncyandimprovethesystemspectralefficiency，whileguaranteesproportionalfairnessamonguser．Keywords：OFDM；LTE；Cross-layerdesign；ResourceAllocation；QoS；目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstract⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．II目录⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．III第1章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1论文研究背景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯