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DMR数字端机物理层传输技术的研究的中期报告 Distributedmultipleaccesstechniquesbasedontimedivisionmultipleaccessandfrequencydivisionmultipleaccessarewidelyusedformobilecommunication.However,withtheincreasingdemandfordatatransmission,thetraditionalanalogcommunicationsystemshavenolongerbeenabletomeettherequirementsofhigh-speedandhigh-qualitymobilecommunication,whichhasledtothedevelopmentofdigitalcommunication.Digitalmobilecommunicationsystemshavetheadvantagesofhighcapacity,highsoundquality,highsecurity,andlowerrorrate.DMRdigitalcommunicationsystemisapopulardigitalmobilecommunicationsystem. ThephysicallayertransmissiontechnologyofDMRdigitalcommunicationsystemisthekeytechnologytoensurethetransmissionqualityofthecommunicationsystem.Itmainlyincludesdigitalmodulationanddemodulationtechnology,codinganddecodingtechnology,synchronizationtechnology,andchannelestimationtechnology.ThepurposeofthisstudyistoinvestigatethephysicallayertransmissiontechnologyofDMRdigitalcommunicationsystem. Atpresent,wehavecompletedthetheoreticalanalysisofthephysicallayertransmissiontechnologyoftheDMRdigitalcommunicationsystem,includingtheanalysisofdigitalmodulationanddemodulationtechnology,codinganddecodingtechnology,synchronizationtechnology,andchannelestimationtechnology.Basedonthis,wehavecarriedoutsimulationexperimentstoverifythecorrectnessofthetheoreticalanalysis. ThesimulationresultsshowthattheDMRdigitalcommunicationsystemwiththephysicallayertransmissiontechnologywestudiedhasgoodtransmissionperformance,andcaneffectivelyguaranteethequalityandreliabilityofcommunication.However,thereisstillroomforimprovementintheperformanceofsometechnologies,andwewillcontinuetocarryoutfurtherresearchandoptimizationinthisarea. Insummary,thismid-termreporthasintroducedtheresearchprogressofthephysicallayertransmissiontechnologyofDMRdigitalcommunicationsystem.Wewillcontinuetooptimizethetechnicalperformanceofthesystemandstrivetoachievebettercommunicationqualityandreliability.