用matlab对基带数字系统进行仿真。整个系统描述了信号的发送和调制过程。其中调制采用16QAM，并且采用基带传输，不必调制到载频上。系统总采用了高斯信道，在接受端采用解调并与发送型号进行比较得到误码率。-Using matlab to base-band digital system simulation. Describes the overall system signal to send and modulation process. Which modulation using 16Q

通信系统仿真实现QAM星座图，插值后Q、I信号波形图，加入高斯白噪声Q、I信号波形，经过匹配滤波后的波形，误码率曲线-Communication Systems Simulation QAM constellations, interpolated Q, I signal waveforms by adding Gaussian white noise Q, I waveform, after matched filtering of the waveform, the error rate c

demodulate_sig 解调 generate_noise 叠加高斯噪声 insert_value 插值 modulate_to_high 调制到载波 pick_sig 采样 plot_2way 绘制正交信号图 plot_astrology 绘制星座图 plot_snr 绘制误码率曲线图 project 主函数 Qam_modulation QAM调制函数 rise_cos 升余弦滤波 stem_2way 绘制滤波后的信号图 -qam