说明：  基于systemview的GSM通信系统仿真。一个实际的GSM系统的System View仿真模型包括：信号源、波形成型、调制、信道传输、射频接收、两次混频和解调器等部分。
(Systemview based on the GSM communication system simulation. An actual GSM System System View simulation model include: signal sources, waveform shaping, modulation, channel transmission, radio frequency receiver, mixer and demodulator two parts.)