说明：  仿真4比特原始数据与星座图的编码映射过程； 完成16QAM信号的调制解调； 绘制16QAM信号的频谱及时域波形； 采用相干解调法仿真其解调过程； 绘制解调前后的基带信号时域波形； 将原始基带数据、QAM已调数据、滤波器系数写入相应的文本文件中。
(Simulation of 4-bit coded mapping process raw data constellation complete 16QAM modulation and demodulation signal draw spectral and time domain waveform 16QAM signal demodulation process simulation using coherent demodulation method baseband signal demodulated before and after the time domain draw waveform the original baseband data, QAM modulated data, filter coefficients corresponding text file written.)