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1、Inthelastfewyears,inthemobilecommunicationmodulatesthedemodulationtechnologysuperiorityinthedevelopmentspeedandthenewapplicationnumberaspect,forhumanextremelyprofoundimpression.Alongwiththesocialeconomydevelopment,themodulatingtechnologymodulatingtechniquer

2、enewscontinuouslyagainandisconsummating,atthesametime,themobilecommunicationhaspassedthroughthefirstgenerationofmobilecommunication,thesecondgenerationofmobilecommunicationandsoonentersthethirdgenerationmobile、communication.Betweenthis,themodulatingtechnolo

3、gymodulatingtechniquedevelopmentisplayingtheextremelyvitalroleininside.Inrecentyears,ourmobilecommunicationserviceswiftandviolentdevelopment,penetratedintosociallifeeachaspect,facingthemotionusergroupcontinuallygrowthandnewserviceemergingoneafteranotherince

4、ssantly,themobilecommunicationsystemmustadaptpromptlyeveninadvanceinthemarketdemandstep.Buttookofadigitalmodulatingtechnologymodulatingtechniquemobilecommunicationcoretechnologiesistherealizationhighspeed,thehighlyeffectivemobilecommunicationsystemimportant

5、guarantee.Thedigitalmodulationdemodulationtechnologyholdstheextremelyimportantstatusinthedigitalcommunication,thecommonlyuseddigitalmodulationincludes:Frequencyshiftkeying(FSK)andphase-shiftkeying(PSK)andsoon.Atpresenthasusedinthemobilecommunicationsystemth

6、emodulatingtechnologymodulatingtechniquebeingpossibletodivideintotwobigkinds:Thelinearmodulationtechnologyandthepermanentenvelopingmodulatingtechnologymodulatingtechniquelinearmodulationtechnologymainlyhas:PSK-BPSK、QPSKOQPSK/4–QPSK、QAM、16QAM、64QAM、256QAM.th

7、epermanentenvelopemodulatingtechnologymodulatingtechniquemainlyhas:MSKTFMGMSK.Thearticleinviewofthethreekindofbasicialmodulationdemodulationtechnologyhascarriedonthedetailedsimulationandtheanalysis,obviously,choosesonekindofmodulatingtechnologymodulatingtec

8、hniqueisdeterminedaccordingtothechannelcharacteristicandtheapplication.ThepowerefficiencyandthefrequencyspectrumefficiencycannotbesatisfactorytobothsidesgenerallyunevenAmerica.Thehighfrequencyspectrume