matlab通信工具箱函数，conmunications Toolbox。-matlab communications toolbox functions, communications Toolbox.

通信系统仿真，调用通信工具箱，QPSK调制，解调，加噪声，观察误码率与信噪比的关系。十分完整-Communication system simulation, communications toolbox calls, QPSK modulation, demodulation, plus noise, observe the relationship between BER and SNR. Very complete

Obsolete modulation fuction for matlab communications toolbox. It needs the ddmod function for demodulation.