OFDM-MIMO系統(tǒng)自適應(yīng)分配算法計(jì)算量的研究.pdf

1、中國科學(xué)技術(shù)大學(xué)碩士學(xué)位論文OFDMMIMO系統(tǒng)自適應(yīng)分配算法計(jì)算量的研究姓名：葉慶豐申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：梁曉雯20070501：罌筌：鶩至筌圣鑒塞薹窯坌墨三鎏薹莖薹塑呈薹蘭莖詈AbstractTherearctwochallengesinthebroadbandmobilecommunicationsystemsinfuture：multipathfadingchannelandbandwidtheffic

2、iencyOrthogonalFrequencyDivisionMulti【plexing(oFOrd)technologyandMultipleInputMultiplerOutput(MIMe)technologyareregardedaseffectivemethodstocombatthesetwoissuesrecentlysothesetechnologiesI凇omethefocusoftheresearchOFDMdiv

3、idesthefrequencyselectivefadingchannelintomultiplesubchannels，SOInterSymhnlIntefference(ISl)canbeminimizedandmultipathfadingeffectCanbereducedMIMOcallproduceindependentsubchannelsandtransmitmultipledatastreamssimultaneou

4、slywhichincreasesthehitratetransmissioneffectivelyOFDMMIMOsystem，thecombinationoftheOFDMandMIMe，leadstotwoeffects：veryhi曲bitratetransmissionandenhnucⅨlreliabilityReseatchsdemonstratethattheapplicationofadaptivemodulation

5、techniqueinOFDMsystemOrOFDMMIMOsystemcanutilizethesystemresourceseffectivelyandenhancethestabilityofsystem。TheOFDMsystemadapdvemodulationtechnique，allocatesdifferemnumbersofbitstoeachsubcatrierandassignscorrespondingpowe

6、rwhichCanachievealloptimizedperformanceIntIIisthesiswefirstintroducethebasictheoryandcharactedsticsofOFDMandMIMOtechnologyandtheadvantagesofthecombinationofthesetwotechnologiesRegardingtheadaptivemodulationtechniqueasthe

7、focusoftheresearchwesummarizesometypicaladaptiveallocationalgorithmsbasedOnthedifferentoptimizedobjects，suchasWaterFillingalgorithnxHughesHmtogsalgorithm，ChowalgorithmandFischeralgorithmTheresearchwhichstudiesthecomputat

8、ionalcomplexityofsometypicaladaptiveallocationalgorithmsinOFDMsystem，paysmoreattentionontheanalysisofHughesHartogsalgorithm’ScomputationalcomplexityBasedonthese，animprovedapproachofreducingthecomputationalcomplexityofHug

9、hesHattogsalgorithmisanalyzedwhichistestifiedbysimulationthatitCanmaintainastableperformanceinthecaseofreducingthecomputationalcomplexityremarkablyUsingthesamemethodsofmakingallanalysisofHugheSHartngsalgorithm’Scomputati

10、onalcomplexitythisstudyalsoanalyzesthecomputationalcomplexityofChowalgorithmandFischeralgorithmandthetimethey∞stincurrentDSPatecalculatedbasedonthesimulationThisworkCanbeusedasareferenceforemployingadaptiveallocationalgo

11、rithmsinpracticalapplicationsinthelastpartofthispaperweintroducetheOFDMMIMOsystemmodel，discussasimplifiedbitallocation(SBA)algorithmwhichbasedontheVBLASTalgorithm。makeananalysisandcomparisonofperformanceandcomputationalc

12、omplexitywhenapplyingtheSBAalgorithmindifferentanteTRlaarmysystems，andthecosttimeofemployingSBAalgodthmindifferentsystemsarecalculatedn“proposedalgorithmmakesallocatingbitsatnongdifferentanteonasandsubcatriersmoreeasilyu