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《基于ofdm的認(rèn)知無線電資源分配算法的研究》由會員上傳分享，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。
1、AbstractCognitiveRadiotechnologyallowsthesecondaryuserstosharethespectrumresourceswithprimaryusersbasedonthepremisethattheinterferenceintroducedtotheprimaryusersisnotserious.Thusthespectrumutilizationcanbeimproved.OFDMhashighcapabilitytoallocatefrequencyres
2、ourcesadaptively,soitcanbeappliedtoCognitiveRadio.Inthispaper,theresearchoncognitiveradioresourceallocationalgorithmsisbasedonOFDMtechnologywhichconsideringtheprimaryusers’interferencelimitationandthecognitiveusers’transmissionlimitation.Thespectrumutilizat
3、ioncanbefurtherimprovedbyoptimallyallocatethesubcarriersandthetransmitpowerofthesubcarrier.Thethesisfirstlyintroducesthecognitiveradio’sprincipleconcept,keytechnologiesandOFDM-basedcognitiveradio.Thenwemainlyresearchtheresourceallocationalgorithmbasedonthef
4、airnessamongsecondaryusersandthesubcarriermatchingandpowerallocationalgorithmsinrelayedOFDMbasedcognitivesystemrespectivelybothfromtheratemaximizationaspect.Weconsidertheproblemofthemaximizationofsecondaryusers’rateassumptionundertheinterferencepowerconstra
5、intatprimaryusers,thetransmitpowerconstraintofsecondaryusersandthefairnessamongthesecondaryusers.Anoptimalresourceallocationalgorithmandasuboptimalalgorithmthatreducesoperationalcomplexityaregiven.Simulationresultsshowthecorrectnessandeffectivenessoftheprop
6、osedalgorithms.Inthiswork,wealsoresearchedtheresourceallocationalgorithmsindecodeandforwardrelayedOFDMbasedcognitivesystem.Inviewofthecurrentalgorithmsrequirethecognitiveradiotransmitterhastheinstantaneouschannelstateinformation,weuseaprobabilisticmodelofin
7、terferencethresholdconstraintwhereinterferencecanbeguaranteedinastatisticmanner.Inthispaper,theproposedresourceallocationalgorithmrequirestheknowledgeofchannelfadingstatisticsinsteadofinstantaneouschannelgainamongthesecondaryusers’transmitterandprimaryusers
8、’receiver,thuseasedrestrictionsontherequirementsofthechannelestimation.Meanwhile,asuboptimalalgorithmthatreducestheoperationalcomplexityisalsogiveninthispaper.Simulationresultsshowthecorrectnessandeffe
