主要研究了直接序列扩频系统，建立了直接序列扩频系统的matlab仿真模型，在信道中存在高斯白噪声和干扰的情况下，对系统的在不同扩频增益下的误码率性能进行了仿真及分析。(The direct sequence spread spectrum system is studied, and the MATLAB simulation model of direct sequence spread spectrum system is established. Under the condition of Gauss white noise and interference in the channel, the BER performance of the system under different spreading gain is simulated and analyzed.)