说明：  一个四用户的扩频通信系统，扩频增益为N=16，采用Walsh码进行直接序列扩频，BPSK调制，无线信道为AWGN信道。在接收端进行解扩，解调，判决，通过仿真得到其中一个用户的误比特率与信噪比的仿真结果。
(A four-user spread spectrum communication system for spreading gain N = 16, the use of Walsh codes for direct sequence spread spectrum, BPSK modulation, AWGN channel for the wireless channel. Carried out in the receiver despreading, demodulation, decision, through the simulation to be one of the user' s bit error rate and signal to noise ratio of the simulation results.)