5、plied.Inthispaper, thebasicprinciple, structureandperformance studyofQAMmodulationanddemodulation systemparameters,simulationperformanceanalysisofSimulink modulationanddemodulationsystemofQAM; andtherealizationmethodof analogsignal digital basic theory indetail, realizethe
6、differenceof Simulinksimulationandperformancecomparisonof sub pulsecodemodulation; construction simulation source QAMtransmissionsystem basedonthetheory, and validationofsimulation andperformancemodeling usingMatlab/Simulink.Keywords:QAM;Quadratureamplitudemodulation;Diffe