这个 matlab 代码仿真了M-QAM的传输。M的取值不同，调制方式分别为4QAM，16QAM，64QAM等。传输信道为AWGN信道，能出误码率曲线(Digital Unit Impulse Discrete Harmonic Signals and their Linear Combination Harmonic Signal with Exponential Envelope. Periodic Sequence of Rectangular Impulses Mixture o

用matlab仿真ASK包络解调，程序完善，结果与理论值非常接近(Using MATLAB to simulate ASK envelope demodulation, the program is perfect, and the result is very close to the theoretical value.)

用MATLAB产生一个频率为1Hz，功率为1的余弦信源，载波频率为10Hz，显示信号的波形及包络，求出调制信号的功率谱密度，以及相干解调后的信号波形(A cosine source with 1 Hz frequency and 1 power is generated by using MATLAB. The carrier frequency is 10 Hz. The waveform and envelope of the signal are displayed. The power

实现包络谱轴承故障诊断检测，通过matlab实现，可以直接演示(The envelope spectrum bearing fault diagnosis and detection is realized by MATLAB, which can be demonstrated directly)