資源描述：
《ofdm系統(tǒng)自適應(yīng)資源分配跨層的研究》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、西南交通大學(xué)碩士研究生學(xué)位論文第1I頁(yè)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；目錄摘要??????????????????????IAbstract?????????????????????．II目錄?????????????????????．III第1章緒論????????????????????．11．1論文研究背景?????????????????
