这个仿真程序用于实现DS-CDMA通信系统仿真,包含三种扩频码的选择，QPSK调制解调，瑞利信道衰落等。-The simulation program used to implement DS-CDMA communication system simulation, including the choice of three types of spreading codes, QPSK modulation and demodulation, Rayleigh fading channel a

此例程为配套书籍的第六章例题7-19的相对应代码，功能为QPSK调制与解调，编程环境为matlab。-This routine supporting books Chapter Example 7-19 corresponding to the code for the function QPSK modulation and demodulation, programming environment Matlab.