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1、Inthelastfewyears,inthemobilecommunicationmodulatesthedemodulationtechnologysuperiorityinthedevelopmentspeedandthenewapplicationnumberaspect,forhumanextremelyprofoundimpression.Alongwiththesocialeconomydevelopment,themodulatingtechnologymodulatingtechniquerenewscontinuouslya

2、gainandisconsummating,atthesametime,themobilecommunicationhaspassedthroughthefirstgenerationofmobilecommunication,thesecondgenerationofmobilecommunicationandsoonentersthethirdgenerationmobile、communication.Betweenthis,themodulatingtechnologymodulatingtechniquedevelopmentispl

3、ayingtheextremelyvitalroleininside.Inrecentyears,ourmobilecommunicationserviceswiftandviolentdevelopment,penetratedintosociallifeeachaspect,facingthemotionusergroupcontinuallygrowthandnewserviceemergingoneafteranotherincessantly,themobilecommunicationsystemmustadaptpromptlye

4、veninadvanceinthemarketdemandstep.Buttookofadigitalmodulatingtechnologymodulatingtechniquemobilecommunicationcoretechnologiesistherealizationhighspeed,thehighlyeffectivemobilecommunicationsystemimportantguarantee.Thedigitalmodulationdemodulationtechnologyholdstheextremelyimp

5、ortantstatusinthedigitalcommunication,thecommonlyuseddigitalmodulationincludes:Frequencyshiftkeying(FSK)andphase-shiftkeying(PSK)andsoon.Atpresenthasusedinthemobilecommunicationsystemthemodulatingtechnologymodulatingtechniquebeingpossibletodivideintotwobigkinds:Thelinearmodu

6、lationtechnologyandthepermanentenvelopingmodulatingtechnologymodulatingtechniquelinearmodulationtechnologymainlyhas:PSK-BPSK、QPSKOQPSK/4–QPSK、QAM、16QAM、64QAM、256QAM.thepermanentenvelopemodulatingtechnologymodulatingtechniquemainlyhas:MSKTFMGMSK.Thearticleinviewofthethreekind

7、ofbasicialmodulationdemodulationtechnologyhascarriedonthedetailedsimulationandtheanalysis,obviously,choosesonekindofmodulatingtechnologymodulatingtechniqueisdeterminedaccordingtothechannelcharacteristicandtheapplication.Thepowerefficiencyandthefrequencyspectrumefficiencycann

8、otbesatisfactorytobothsidesgenerallyunevenAmerica.Thehighfrequencyspectrume