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1、AdaptiveEqualizationSHAHIDU.H.QURESHI,SENIORMEMBER,IEEElnvitedPaperBandwidth-efficientdatatransmissionovertelephoneandradio-usuallystatistical-maybeadditiveand/ormultiplica-channelsismadepossiblebytheuseofadaptiveequalizationtotive,becauseofpossiblebackgroundth
2、ermalnoise,im-compensateforthetimedispersionintroducedbythechannel.pulsenoise,andfades.TransformationsperformedbytheSpurredbypracticalapplications,asteadyresearcheffortoverthechannelarefrequencytranslation,nonlinearorharmoniclasttwodecadeshasproducedarichbodyof
3、literatureinadaptiveequalizationandtherelatedmoregeneralfieldsofreceptionofdistortion,andtimedispersion.digitalsignals,adaptivefiltering,andsystemidentification.ThisIntelephonelines,timedispersionresultswhenthetutorialpapergivesanoverviewofthecurrentstateofthea
4、rtinchannelfrequencyresponsedeviatesfromtheidealofadaptiveequalization.Inthefirstpartofthepaper,theproblemofconstantamplitudeandlinearphase(constantdelay).intersymbolinterference(19)andthebasicconceptoftransversalequalizersareintroducedfollowedbyasimplifieddesc
5、riptionofEqualization,whichdatesbacktotheuseofloadingcoilstosomepracticaladaptiveequalizerstructuresandtheirproperties.improvethecharacteristicsoftwisted-pairtelephonecablesRelatedapplicationsofadaptivefiltersandimplementationapforvoicetransmission,compensatesf
6、orthesenonidealproachesarediscussed.Linearandnonlinearreceiverstructures,characteristicsbyfiltering.theirsteadystateperformanceandsensitivitytotimingphaseareAsynchronousmodemtransmittercollectsanintegralpresentedinsomedepthinthenextpart.Itisshownthatafractional
7、lyspacedequalizercanserveastheoptimumreceivefilternumberofbitsofdataatatimeandencodesthemintoforanyreceiver.Decision-feedbackequalization,decision-aidedIS1symbolsfortransmissionatthesignalingrate.Inpulsecancellation,andadaptivefilteringformaximum-likelihoodseam
8、plitudemodulation(PAM),eachsignalisapulsewhosequenceestimationarepresentedinacommonframework.Thenextamplitudelevelisdeterminedbythesymbol,e.g.,ampli-twopartsofthepaperaredev
