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1、数字调制解调技术英文文献Technologyofdigitalmodulationanddemodulationplaysaimportantroleindigitalcommunicationsystem,thecombinationofdigitalcommunicationtechnologyandFPGAisacertainlytrend.Withthedevelopmentofsoftwareradio,therequirementfortechnologyofmodulationandde
2、modulationishigherandhigher.Thispaperstartswithstudyingdigitalmodulationanddemodulationtheoryatfirst,andanalysesbasicprincipleofthreekindsofimportantmodulationanddemodulationway(FSK,MSK,GMSK).TheRohde&SchwarzSME03,SignalGenerator,providesAMmodulationand
3、ExternalFSKdigitalmodulationrequiredforthedevelopmentandtestingofdigitalmobileradioreceivers.TheapplicationofPWMindigitalmodulationanddemodulationforanalogcommunicationsignalsinseveralmodulationmodesResearchresultsprovethatthedesignofdigitalIFmodulatora
4、nddemodulatorofSoftwareRadioappeasesthecapabilityandrequirementofSoftwareRadio.Atransfusionspeedmonitorsystemisdesignedbasedoninfraredtechnologywithmodulationanddemodulation.It'sthecombinationofmodulatoranddemodulator.Timesynchronizationthatiskeytechnol
5、ogyofdigitaldemodulationisccalliedbysoftware.Thepaperprovidesthe designofhardwareofdigitalIFmodulatoranddemodulatorofSoftwareRadiowhichincludesDigitalSignalProcessor、MicroControlUnitandAD/DAconvertoretc.DigitalDown/UpConverter(DDC/DUC),modulationanddemo
6、dulationarediscussedinthedissertationassomeessencialpartsofSDRplatform.TwoWayAutomaticCommunicationSystem(TWACS)isanewvaluablecommunicationtechnologyfordistributionnetworks,whichhasspecialofmodulationanddemodulation.Inthispaper,westudytheOFDMtechnologyb
7、asedon802.16a,realizethebasebandmodulationanddemodulationbyusingTMS320C6201,andoptimizethesoftwaremodule.ThepaperintroducestheprincipleofQPSKmodulationanddemodulation,thecircuitarealsoberealizedbasedonFPGA.Withtheimprovementofthetechnology,especiallyint
8、hefieldssuchascomputertechnology,datacodingandcompress,digitalmodulationandVLSI,theworldelectronicinformationindustryenterintothedigitalera.First,thefeaturesoffaxcommunicationandthemodeofmodulationanddemodulationaredescribed.Inau
