Then digital matched filter (DMF), which is used to synchronize spread spectrum code, especially the multi-rate sampling in DMF is studied.

然后探讨了用于扩频码同步的数字匹配滤波器（DMF），着重分析了DMF的多倍码速率采样问题；

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The spread spectrum (SS) signal is modulated by high-rate pseudo noise code, and belongs to typically periodic signal.

被高速伪随机码调制的扩频信号，其伪随机码是具有随机编码信号特征的周期信号。

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