仿真数字信号的载波传输，包括PAM信号，PSK信号，QAM信号，FSK信号的仿真。具体就是数字信号的产生，调频与解调。-Simulation carrier transmission of digital signals, including the simulation signal PAM, PSK signals, QAM signal, FSK signals. Specifically the digital signal is generated, the FM demodulati