说明：  直接序列扩频Matlab程序 直接序列扩频通信可以有效地抵抗来自信道中的窄带干扰。在一个直扩通信系统中,扩频是通过伪噪声序列(PN)对发送的信息数据进行调制来实现 的。在接收端,原伪噪声序列和所收信号的相关运算可将窄带干扰扩展到DS信号的整个频带,使干扰等效为幅度较低频谱较平坦的噪声；同时，将DS信号解扩, 恢复原始信息数据
(Direct Sequence Spread Spectrum Matlab program direct sequence spread spectrum communication can effectively resist from narrowband interference channel. In a DSSS communication system, the spread spectrum is modulated by a pseudo-noise (PN) sequence on the information data transmitted to achieve. The receiving end, the correlation calculation of the original pseudo-noise sequence and the received signal may be narrowband interference extended to the entire frequency band of the DS signal, the interference is equivalent to the relatively flat lower spectral amplitude noise same time, the DS signal despreading, restore original information data)