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1、ACOMPARISONOFANALOGFRONTENDARCHITECTURESFORDIGITALRECEIVERSHollyPekauStudentMember,IEEE,UniversityofCalgaryTRLabse-mail:pekau@atips.caJamesW.HaslettFellow,IEEE,UniversityofCalgaryTRLabse-mail:haslett@enel.ucalgary.caAbstractRadioreceiversthatperformanalogtodigitalconversioncloserto
2、theantennaanddomostofthesignalprocessinginthedigitaldomainareknownasdigitalreceivers.Digitalreceiversaredesirablebecausetheycanbemoreeasilyre-configuredformultista-dardoperation,theycanfacilitateperformanceimprovementsbyusingdigitalfiltersforsignalprocessing,andtheycanpotentia-llyrea
3、lizesavingsinchiparea,powerconsumptionandcost.Thedefinitionofadigitalreceiverisgeneralandthereareseveraltypesofreceiverarchitecturesthatfallintothiscategory.DigitalreceiverarchitectureswhichhavebeenproposedincludedirectRFNyquistsampling,RFbandpasssamplingorsub-sampling,directIFNyqui
4、stsampling,andIFbandpasssamplingorsubsamp-ling.Thispapercomparesthesedigitalreceiverarchitecturesinvariouscategoriesincludingsusceptibilitytoaperturejitterandaperturedistortion,noisefiguredegradationduetoaliasing,easeofanti-aliasingfilterimplementation,easeofADCimplemen-tation,linear
5、ity,powerconsumption,chiparea,andre-configurability.SystemandcircuitlevelsimulationsusingacommercialRFsimulatorareperformedtoquantitativelycomparethedifferentdigitalreceiverarchitecturesinsomeoftheaforementionedcategories.Thefeasibilityofusingtheproposeddigitalreceiverarchitecturesf
6、orvariousstandardsisthenexaminedandasurveyofpublisheddigitalreceiverarchitecturesispresented.Keywords:Digitalreceiver,softwareradio,sub-sam231IntroductionTheincreasingdemandforflexiblemulti-standard,multi-bandradiosincreasesandrecentimprovementsinanalog-to-digitalconvertertechnology
7、haveledtothedevelopmentofsoftwareradioswithdigitalreceivers.Inasoftwareradioreceiver,widebandanalog-to-digitalconversionthatcapturesmultiplechannelsofthesoftwareradionodeisperformedclosertotheantenna.Inadditiontotheimprovedflexibilityofusewithmultiplestandardsovermultiplefrequencyba
8、nds,digitalreceiversofferp