MIMO-OFDM系統(tǒng)子載波分配算法研究.pdf

1、西南交通大學(xué)碩士學(xué)位論文MIMOOFDM系統(tǒng)子載波分配算法研究姓名：魏方旭申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：胡曉鵬20120507西南交通大學(xué)碩士研究生學(xué)位論文第fI頁AbstractThecontradictionbetweentheshortageofwirelessspectrumandthedemandofhighdatarateisbecomingmoreandmoreprominent，andit’Simper

2、ativetoimprovethespectralefficiencyStaticradioresourceallocationcan’tmeettheneedofcommunicationbecauseofthecomplexityanduncertaintyofthewirelesscommunicationenvironmentInordertoincreasethespectralefficiencyit’Snecessaryt

3、oinvestigatethewayofresourceallocationaccordingtotherealtimeinformationofchannels，namelyadaptiveradioresourceallocationOn也eotherhandtheapplicationofnewtechnologiesisalsoafeasiblewaytoimprovesystemperformance，suchasMultip

4、leInputMultipleOutputOviMo)andOrthogonalFrequencyDivisionMultiplexing(OFDM)thatarewidelyusedinthenextgenerationmobilecommunicationsystemsThesetechnologiesgreatlyincreasetheflexibilityandcomplexityofadaptiveresourcealloca

5、tionwhileimprovingsystemperformanceTherefore，theeffectiveradioresourceallocationalgorithmsplayanimportantrolemwirelesscommunicationsAdaptivesubcarriersallocationalgorithmforthedownlinkOfMⅡⅥOOFDMsystemisstudiedandtheperfo

6、rmanceofthealgorithmisevaluatedbythemetricsincludingcapacityfairnessandcomputationalcomplexitynlechanneloneachsubcarrierisviewedasaflatfadingMIMOchannelandanewOFDMsubcarrierallocationalgorithmintheMIMOenvironmentsispropo

7、sedThepurposeofthealgorithmistoimprovethespectralefficiencyandtoenhancethefairnessbetweenusersTheproposedalgorithmcarriesouttheallocationofsubcarrierswiththeproportionalfairnessconstraintstrictlyfollowedfirstlyandthenthe

8、subcarriersareswappedbetweenusersrepeatedlyuntilthecapacitycan’tbeincreasedAsaresultthecapacityISfurtherimprovedwiththeproportionalfairnessguaranteedSimulationshowsthatthealgorithmCanimprovethecapacityeffectivelycompared

9、withproportionalresourceallocationandthefairnessiSclosetotlleproportionalresourceallocationTomakefulluseofthespatialadvantageofmultiantennasystem，resourceallocationISextendedfromfrequencytospaceandfrequencyandajointanten

10、naandsub。carriersallocationalgorithmisdiscussedThealgorithmisimplementedcarrierbycarrierwhichchoosessomeusersfromallusersthatneedtoallocatesubcarriersaccordingtotheratioofthecurrentrateandtheproportionalconstraintofeachu