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1、WIDEBANDWIRELESSACCESSTECHNOLOGIESTOBROADBANDINTERNETFrequencyDomainEqualizationforSingle-CarrierBroadbandWirelessSystemsDavidFalconer,CarletonUniversitySirikiatLekAriyavisitakul,RadiaCommunicationsAnaderBenyamin-Seeyar,HarrisCorp.BrianEidson,ConexantSystems,Inc.ABSTRACTsuc
2、henvironmentsmultipathcanbesevere.Thisraisesthequestionofwhattypesofanti-multi-Broadbandwirelessaccesssystemsdeployedpathmeasuresarenecessary,andconsistentwithinresidentialandbusinessenvironmentsarelow-costsolutions.Severalvariationsoforthogo-likelytofacehostileradiopropaga
3、tionenviron-nalfrequency-divisionmultiplexing(OFDM)ments,withmultipathdelayspreadextendinghavebeenproposedaseffectiveanti-multipathovertensorhundredsofbitintervals.Orthogo-techniques,primarilybecauseofthefavorablenalfrequency-divisionmultiplex(OFDM)isatrade-offtheyofferbetw
4、eenperformanceinrecognizedmulticarriersolutiontocombattheseveremultipathandsignalprocessingcomplexi-effectsofsuchmultipathconditions.Thisarticlety[1].surveysfrequencydomainequalization(FDE)Thisarticlediscussesanalternativeapproachappliedtosingle-carrier(SC)modulationsolu-ba
5、sedonmoretraditionalsingle-carrier(SC)tions.SCradiomodemswithfrequencydomainmodulationmethods.Weshowthatwhencom-equalizationhavesimilarperformance,efficien-binedwithfrequencydomainequalization(FDE),cy,andlowsignalprocessingcomplexityadvan-thisSCapproachdeliversperformancesi
6、milartotagesasOFDM,andinadditionarelesssensitiveOFDM,withessentiallythesameoverallcom-thanOFDMtoRFimpairmentssuchaspowerplexity.Inaddition,SCmodulationusesasingleamplifiernonlinearities.Wediscusssimilaritiescarrier,insteadofthemanytypicallyusedinanddifferencesofSCandOFDMsys
7、temsandOFDM,sothepeak-to-averagetransmittedpowercoexistencepossibilities,andpresentexamplesofratioforSC-modulatedsignalsissmaller.ThisinSC-FDEperformancecapabilities.turnmeansthatthepoweramplifierofanSCtransmitterrequiresasmallerlinearrangetosup-portagivenaveragepower(inoth
8、erwords,INTRODUCTIONrequireslesspeakpowerbackoff).Assuch,thisBroadbandwirelessacce
