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1、JOURNALOFCOMMUNICATIONSANDNETWORKS,VOL.11,NO.2,APRIL2009165DistributedPowerandRateControlforCognitiveRadioNetworksWeiWang,WenboWang,YajunZhu,andTaoPengAbstract:Inthispaper,adistributedpowerandend-to-endratetemperaturemodel,bothprimaryandsecondaryuserscanco-controlalgorithmisproposed
2、inthepresenceoflicensedusers.existonthesamespectrum.Thesecondaryusers’interferenceByLagrangiandualitytheory,theoptimalpowerandratecontrolattheprimaryreceiversisnotallowedtoexceedtheinterfer-solutionisgivenfortheunlicenseduserswhilesatisfyingthein-encetemperaturelimit[6].Inordertoeva
3、luatetheinterferenceterferencetemperaturelimitstolicensedusers.Itisobtainedthattolicenseduser,FederalCommunicationsCommission(FCC)transmittingwitheither0orthemaximumnodepoweristheop-introducedtheconceptofinterferencetemperature[7],whichistimalscheme.Thesynchronousandasynchronousdist
4、ributedal-intendedtoquantifyandmanagetheinterferenceinradioen-gorithmsareproposedtobeimplementedatthenodesandlinks.vironment.Inthispaper,theinterferencetemperaturemodelisTheconvergenceoftheproposedalgorithmsareproved.Finally,considered.furtherdiscussionontheutility-basedfairnessispr
5、ovidedfortheproposedalgorithms.NumericalresultsshowthattheproposedPowercontrolisanefficientmethodtorestricttheinterfer-algorithmcanlimittheinterferencetolicenseduserunderapre-enceforhandlingtheco-existenceproblem.Itismainlyuseddefinedthreshold.forimprovingthesystemthroughputanddecreas
6、ingtheinter-ference.Someexistpublications[8]–[10]haveinvestigatedtheIndexTerms:Cognitiveradio,fairness,Lagrangianduality,powerpowercontrolprobleminwirelessnetworks,buttheydonottakecontrol,ratecontrol,wirelesscommunication.theinterferencecausedbyunlicenseduserstolicensedusersintoacco
7、unt.In[11],jointpowerandratecontrolisinvestigatedbyLagrangianduality.Ourpreviousworks[12]–[14]givesomeI.INTRODUCTIONpreliminaryresultsonpowercontrol.However,thereisfewpub-Cognitiveradioisoneoftheemergingcommunicationtech-licationsonjointpowerandratecontrolforcognitiveradionet-nologi
8、esrecently.Becauset
