QPSK信号通过瑞利衰减信道后的误比特率和误符号率，并于AWGN信道下的误比特率和误符号率进行对比。-The QPSK signal is compared with the bit error rate and the error symbol rate after the Rayleigh attenuation channel and the bit error rate and the error symbol rate under the AWGN channel.