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对数字调制技术PSK ASK QPSK , л/4Dqpsk qaM等数字调制方法进行的介绍，重点介绍 QAM，阐述了其基本原理，对其进行频谱分析，误码性能分析 。并用MATLAB对QAM调制解调进行访真实验，通过仿真观察到调制与解调信号的波形，星座图以及QAM功率谱密度曲线，并对仿真进行分析，由分析结果知道QAM 调制系统具有很高的频谱利用率以及良好的误码性能。
Theintroductionofdigitalregulationandcontroltechnology,suchasPSKASKQPSK,л/4DqpskqaM, imarilyfocusesonQAM,expoundingQAM'sfundamentalprinciplesandanalyzingitinthefrequencyspectrumandmiscodefuntionperspective。
QAMregulationandcontrolmodeisresembledlyexperimentedbyMATLAB,throughwhichsignalwaveofregulationandcontrol,chartofconstellationstyleandcurvesofQAM power density can be observed。
The next step is to analyze the resembled experiment, which demonstrates a high utilization and excellent miscode fuction of QAM regulation and control system。
Logarithm character modulating technique PSK ASK QPSK, л digitalmodulation method and so on /4Dqpsk qaM carries on the introduction,introduces QAM with emphasis, elaborated its basic principle, carrieson the spectral analysis to it, harms the code performance analysis。
And carries on with MATLAB to the QAM modulation demodulation visitsreally tests, observes the modulation and the demodulation signalprofile through the simulation, the constellation chart as well as theQAM power spectral density curve, and carries on the analysis to thesimulation, by the analysis result knew the QAM modulation system hasthe very high frequency spectrum use factor as well as good harms thecode performance。
DigitalmodulationtechniquePSKASKQPSK,л/ scribesitsbasicprinciples,itsspectralanalysis,performanceanalysis。UsingMATLABQAMmodulationanddemodulationforvisittoreallyexperimentSimulationobservedmodulationanddemodulationofthesignalwaveform,QAMconstellationmapandthepowerspectraldensitycurve,aswellassimulationanalysisResultsfromanalysistoknowQAMmodulationsystemwithveryhigh spectral efficiency and good BER。
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This article introduces the digital modulation technology of PSK ASK QPSK and modulation method of л/4Dqpsk qaM。
It introduces QAM with emphasis, analyzing the spectrum and Bit Error Rate(BER) performance, also simulating modulation/demodulation of QAM with MATLAB, analyzing the waveform, constellation plot and peak power density curve from the simulation, concluded that the QAM is with high spectrum utilization efficiency and good BER performance。
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