QPSK调制的Matlab程序。包含了QPSK调制及误码率分析。可以调制一随机产生的序列来分析误码率，也可以调制一幅图像来分析误码率。-QPSK modulation of the Matlab program. Contains a QPSK modulation and BER analysis. Can be modulated to a randomly generated sequence analysis of BER, an image can also be prepared t