中文说明：基于matlab的QPSK调制的DS-CDMA多用户通信系统仿真，信道为多径瑞利衰落信道，高斯白噪声信道，根升余弦滤波、误码率性能分析
English Description：
Matlab based QPSK modulation of DS-CDMA multi-user communication system simulation, the channel is multipath Rayleigh fading channel, Gauss white noise channel, root raised cosine filter, BER performance analysis