毕业论文外文翻译-移动通信系统的解调技术

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1、吉林化工学院信息与控制工程学院毕业设计（论文）外文翻译1原文Inrecentyears,ourmoblecommunicationserviceswiftandviolentdevelopment,penetratedintosociallifeeachaspect,facingthemotionusergroupcontinuallygrowthandnewserviceemergingoneafteranotherincessantly,themobilecommunicationsystemmustadaptpromptlyevenina

2、dvanceinthemarketdemandstep.Buttookofadigitalmodulatingtechnologymodulatingtechniquemobilecommunicationsystemimportantguarantee.Thedigitalmodulationdemodulationtechnolagyholdstheextremelyimportantstatusinthedigitalcommunication,thecommonlyuseddigitalmodulationincludes:Freque

3、ncyshiftkeying(FSK)andphase_shiftkeying(PSK)andsoon.Atpresenthasusedinthemobilecommunicationsystemthemodulatingtechnologymodulatingtechniquebeingpossibletodivideintotwobigkinds:Thelinearmodulatingtechnologyandthepermanentenvelopingmodulatingtechnologymodulatingtechniquelinea

4、rmodulationtechologymainlyhas:PSK-BPSK、QPSKOQPSK/4-QPSK、QAM、16QAM、64QAM、256QAM.thepermanentenvelopemodulatingtechnologymodulatingtechniquemainlyhas:MSKTFMGMSK.Thearticleinviewofthethreekindofbasicialmodulationdemodulationtechnologyhascarriedonthedetailedsimulationandtheanaly

5、sis,obviously,choosesonekindofmodulatinftechnologymodulatingtechniqueisdeterminedaccordingtothechannelcharacteristicandtheapplication.ThepowerefficiencyandthefrequencyspwcturmeffciencycannotbesatisfactorytobothsidesgenerallyunevenAmerica.Thehighfrequencyspecteumefficiencynee

6、dstosacrificecertainpowereffciencytoobtain;Similarly,thehighpowerefficiencyalsoneedstosacrificecertainfrequencyspecteumsfficiency.Alongwiththemodulationtechniqueintheunceasingdevelopment,thenewmodulatingtechnologymodulatingtechniquemighebeingthebetterfrequencyspectrumefficie

7、ncyandthehigherpowerefficiency.FSKandPSKinthenumeralmoiblecommunicationthefindapplication,inwhichFSkalreadyobtainedtheuseinthesimulationmobilecommunicationdigtalsignaling.QAMappliesinthefixedpoint-to-pointdigitalmicrowavesystemwidely,ithastheweryhighfrequencyspectrumusefacto

8、r.ButthemobilecommunicationenvironmentregardingthetraditionalQAMmodulationi