ofdm系统中自适应资源分配算法的-研究、设计与性能分析

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1、万方数据东北大学硕士学位论文AbstractResearchDesignandAnalysisonAdaptiveResourceAllocationAlgorithminOFDMSystemAbstractWiththedevelopmentofmodemmobilecommunication，thespectralresourceisbeingscarebecauseofthepeople’SdesireforthemultimediaandinterconnectionwithInternetinthemobileservice．Soithasbeenanurgenttasktop

2、ursenewwirelesstechnologywithspectralefficiency．TheprominentadvantagesofOFDMsystemarethehighefficiencyspectrumandanti-multi-pathdelayedability,andtheOFDMtechnologyissuitablefortheapplicationsoffuturehigh-speedbandwidthwirelesscommunication．TheadaptiveresourceallocationofOFDMsystemallocatesthesub-

3、carrier,bitandpowerbasedonthereal-timechannelinformation．Firstly,thepaperintroducesthedevelopmentandbasicprincipleofOFDMsystemandthewirelesschannelenvironment；thenseveraladaptivebitandpowerallocationclassicalalgorithmsforsingleuserOFDMsystemareresearched．Akindofadaptivebitandpowerallocationalgori

4、thmforthesingleuserOFDMsystembasedonMAcriterionisdesignedbecauseofthehighcomplexityforthegreedyalgorithm．Theimprovedalgorithmdeletesthesub—channelsthatarenotsuitablefortransmittingthedatainformationandallocatesthebitaccordingtochannelcapacit5andthenadjuststhebitusinggreedyalgorithmwithchangeables

5、teps，theBERandtransmittingpowerperformancesareverysimilarbetweentheimprovedalgorithmandgreedyalgorithm，buttheCPUrunningtimeofimprovedalgorithmdecreasesdoubled，andeffectivelyreducesthecomplexityoftheresourceallocationalgorithm．Thenthepaperstudiesadaptiveresourceallocationofmulti—userOFDMsystem，the

6、nthepaperstudiesadaptiveresourceallocationofmulti—userOFDMsystem．Firstly,weanalyzethedifferenceofdynamicresourceallocationbetweenmulti-userOFDMsystemandsingleuserOFDM．Secondly,basedonuserneeddegreeisgiveninordertodecreasethecomplexityoftwo-stepalgorithm，amethodbasedongeneticalgorithmisproposedint

7、hispaperinordertosolvetheproblemofresourceallocationofmulti—userOFDMsystem．Thetransmissionpoweroftheimprovedalgorithmhasabout5dBlowerthanOFDM-TDMAfixedresourceallocation．Atthesametime，theCPUrunningtimeoftheimprovedalgo