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基于OFDM的认知无线电系统中可变点FFT处理器的设计及FPGA实现.docx

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基于OFDM的认知无线电系统中可变点FFT处理器的设计及FPGA实现 Abstract TheOFDM-basedcognitiveradiosystemisanemergingtechnologythatinvolvesthedetectionofunusedspectrum,usedbyprimaryusers.Toimplementacognitiveradiosystem,avariablepointFFTprocessorisrequiredwhichallowsthesystemtoadapttodifferentsignalsizes.ThispaperpresentsthedesignandimplementationofavariablepointFFTprocessorforOFDM-basedcognitiveradiosystemusingFieldProgrammableGateArray(FPGA)technology.Thedesignandimplementationprocessisdiscussedindetail,includingthedesignofthearchitecture,pipelining,andsimulationresults.TheproposeddesignhasbeenimplementedonFPGAandtestedfordifferentinputsignalsizes,andithasbeenobservedthattheproposeddesigncanprocesssignalswithdifferentsizesthroughthechosenalgorithm. Keywords:OFDM,cognitiveradio,variablepointFFT,FPGA. Introduction OFDMisamodulationschemethatiscommonlyusedinwirelesscommunicationsystems.Itiswidelyusedduetoitsabilitytominimizetheeffectofmultipathfadingandtoprovidehighspectralefficiency.Cognitiveradio(CR)isatechnologythatusesunusedspectrum,usedbyprimaryusers,forcommunicationpurposes.OFDM-basedcognitiveradiosystemsaregainingpopularityduetotheirabilitytoadapttodifferentsignalsizesandtoleverageunusedspectruminanefficientway.Thevariablepoint(VP)FFTprocessorisanessentialcomponentoftheOFDM-basedcognitiveradiosystem,whichallowsthesystemtoadapttodifferentsignalsizes. Inthispaper,aVPFFTprocessordesignandimplementationforOFDM-basedcognitiveradiosystemarepresented.ThemainobjectiveofthisworkistodesignandimplementaVPFFTprocessorthatcanefficientlyprocesssignalswithdifferentsizes.ThearchitectureoftheproposeddesignandtheimplementationprocessusingFPGAtechnologyisdescribedindetail.Additionally,thesimulationresultsarepresented,whichdemonstratesthattheproposeddesigncanefficientlyprocesssignalswithdifferentsizes,andcanadapttochangesefficiently. Background OFDM-basedcognitiveradiosystemsrequirehighprocessingspeedforsignalprocessing,andhenceitrequirestheuseofanFFTalgorithmthatcanprocesssignalsefficiently.TheFFTalgorithm