实现4QAM通信系统的调制和解调仿真，当输入二进制码流后可以给出详细的调制和解调过程，有波形图，包含误码率仿真功能，内部注释信息详细，适用于通信专业同学。-To realize the modulation and demodulation of 4QAM communication system simulation.when the modulation and demodulation process are given in detail the input binary code stream, a waveform simulation function, including bit error rate, internal annotation information in detail, suitable for communication students