中文说明：采用多进制QAM方式，4QAM,16QAM等，通过调制解调，计算其误码率，并绘制了误码率曲线，内容很详细，可以观看学习。
English Description：
It adopts multi system QAM mode, 4QAM, 16QAM and so on. Through modulation and demodulation, it calculates the bit error rate, and draws the bit error rate curve. The content is very detailed, you can watch and learn.