说明：  % QAMModem.m程序清单 % 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； % 基带信号符号速率 ps ＝1Mbps； % 成形滤波器的滚降因子 a=0.8； % 载波信号频率fc=2MHz ； % 采样频率 Fs=8MHz ； % 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。 clc;
(%Qammodem. M program list %The coding mapping process of 4-bit original data and constellation is simulated; %Complete the modulation and demodulation of 16QAM signal; %Baseband signal symbol rate PS = 1Mbps; %Roll off factor of shaping filter a = 0.8; %Carrier signal frequency fc = 2MHz; %Sampling frequency FS = 8MHz; %Draw the spectrum and time domain waveform of 16QAM signal; %The coherent demodulation method is used to simulate the demodulation process; %Time domain waveform of baseband signal before and after demodulation is drawn; %Write the original baseband data, QAM adjusted data and filter coefficient into the corresponding text file.)