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modulation signal中文是什么意思

  • 调制信号

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  • This thesis presents the time domain character and frequency domain character of common used signals , including digital modulation signals and analogue modulation signals . the first method is to extract feature parameters from time domain and frequency domain . it can distinguish 2ask , 4ask , 2fsk , 4fsk , bpsk , qpsk , 16qam , 64qam and it is demonstrated by simulation data and sampled data
    本文介绍了常用的通信信号(包括模拟调制样式和数字调制样式)的时域、频域特征,首先从时频域提取信号的特征参数,用于区分2ask 、 4ask 、 2fsk 、 4fsk 、 bpsk 、 qpsk 、 16qam 、 64qam这8种信号,用仿真信号和实际采样信号验证了该方法的可行性。
  • Chaotic switching modulation signals generated from different chaos sequences have been used to control smps . the effect of reducing the level of emi be compared . simulation results demonstrate : in the cpwm and cppm , chaos sequences generated from henon map is superior to the one generated from chua ' s circuit at lower multiples of switching frequency on reducing the level of emi ; in the ccfmfd , it has contrary results ; in the ccfmvd , chaos sequences generated from chua ' s circuit is superior to the one generated from henon map
    仿真结果表明: cpwm和cppm模式下, henon映射混沌序列在较低次谐波处降低emi水平的效果要好于蔡氏电路混沌序列的效果。 ccfmfd模式则有相反的结果。对ccfmvd模式,蔡氏电路混沌序列比henon映射混沌序列降低emi水平的效果明显要好。
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