一种基于注水算法的认知OFDM系统资源分配方法

20101151JOURNALOFXIANUNIVERSITYOFPOSTSANDTELECOMMUNICATIONSJan.2010Vol115No11:2009-09-08:(NCET-08-0891):(1983-),,,;(1971-),,,,,OFDM,(,710121):,,,,OFDM,,:;;;OFDM:TN919.72:A:1007-3264(2010)01-0009-04,,,FCC[1],70%,(CR,CognitiveRadio)[2-3](OpportunisticWay),,()OFDM[4-5],,,,OFDMOFDM,CR-OFDM,(,),T.WeissF.Jondral[6][7],,,,[8](,,),1,OFDM-CR,1,K,,(2),(h11,h12,,h1N,,hK1,hK2,,hKN),(n),(pthn),12,;,,,,,:maxkn,pknKk=1Nn=1fknlog2(1+pknh2knN0f)(1):Kk=1Nn=1pknPtotal(2)pknpthn(3)kn{0,1}(4)K,N,n,pknkn,,pknkn,kn10nk,hknkn,f,N0,SNR[9](SNRGAP),,,pthnn,Ptotal,knpkn2,,:2.1,…p=Ptotal/N,,forn=1toNk=argmax(Rkn);index(n)=k;kn=1;endRknkn,Rkn=flog2(1+…ph2knN0f),k=argmax(Rkn)nk,index(n)=k,kn=1nk(),,N,HH=[hindex(1),1,hindex(2),2,,hindex(N),N][h1,h2,,hN],hnn2.2,,01201012.2.1,OFDM-CR,H,:maxpNn=1flog2(1+pnh2nN0f)(5):Nn=1pnPtotal(6)pnn,hnn,,n:pn=1-N0fh2n+(7),,2.2.2,,,,((3)),:(1),(2.1),P=[p1,p2,,pN],P1N,(2)(n),pnpthn,,min(pn,pthn),(2),,,,,(3),,,,31000010,64,1W,1M/64Hz,10-6,3,11121314151719,(2)1618,,(2),34,,,,4111,:OFDM44,,,;,,,,,,[1]FederalCommunicationsCommission:Cognitiveradiotechnologiesproceeding.ReportETDocket,no.03-108,2003.[2]SimonHaykin.CognitiveRadio:Brain-EmpoweredWirelessCommunicationIEEEJournalonSelectedAr2easinCommunication[J].February,2005,23(2):201220.[3]JosephMitola.Cognitiveradioforflexiblemobilemulti2mediacommunications.SixthInternationalWorkshoponMobileMultimediaCommunications.SanDiego,CA,November1999(2):3-10.[4]D.Cabric,S.M.Mishra,R.W.Brodersen.Implemen2tationissuesinspectrumsensingforcognitiveradios,in:Proc.38thAsilomarConferenceonSignals,Sys2temsandComputers2004,November2004:772-776.[5]LiXiaohui,LiuNaian,YiKechu,etal.JointSubcarrierandPowerAllocationforMultiuserOFDMSystemsandPerformance[J].JournalofXidianUniversity,2005,33(3):151-159.[6]D.Cabric,S.M.Mishra,D.Willkomm,R.Broder2sen,A.Wolisz.ACognitiveradioapproachforusageofvirtualunlicensedspectrum,in:Proc.14thISTMobileandWirelessCommunicationsSummit,June2005.[7]KolodziejskiK.R,BETZJ.W.Detectionofweakran2domsignalsinIDDnon-Gaussiannoise.IEEETrans.Commun.,2000,48:222-230.[8]HaykinS.Cognitiveradio:brain-empoweredwirelesscommunications.IEEEJ.Sel.AreasCommun.,2005,23:201-220.[9]CioffiJ.M,etal.MMSEdecision-feedbackequalizersandcodingpartI:Equalizationresults.IEEETrans.OnCommunications,1995,43(10):2582-2594.Aradioresourceallocationmethodbasedonwater-fillingalgorithmforOFDM-CRsystemsLIUPeng-fei,LUGuang-yue(SchoolofCommunicationandInformationEngineering,XianUniversityofPostsandTelecommunications,Xian710121,China)Abstract:Thescarcenessofwirelessspectrumisthebottleneckthathampersthesustainabledevelopmentofwirelesscommunicationservices.Cognitiveradioisconsideredasanovelmethodtosolvetheproblemoftheshortageofthewirelessspectrum.SmartusercanuseCRtechnologytosensetheenvironment,searchfortheavailablespectrumresourceandaccessdynamicallytothesystem.Hencethespectrumefficiencyisimprovedandthecapacityofthewirelesscommunicationsystemisincreased.Thispaperintroducesaresourceallocationmethodbasedonthewater-fillingalgorithmtorealizetheresourcemanagementforOFDM-CRsystem,com2paredwiththetraditionalpowerdistributionalgorithm,thesystemthroughputissignificantlyimproved.Keywords:water-fillingalgorithm;cognitiveradio;resourceallocation;OFDM2120101