基于Simulink的QPSK的调制解调，高斯信道，采样和保持，判决门限，低通滤波，误码率统计等，建议采用MATLAB新版本。-Based on Simulink QPSK modulation and demodulation, Gaussian channel, sampling and hold, decision threshold, low-pass filter, bit error rate statistics, the proposed new version of MATLAB.