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中文摘要：
为直接顺序传播光谱信号的 despreader 的一种新类型被建议。与传统的 despreaders 相比，新 despreader 不再包含难决定商品或柄二进制代码顺序，并且局部地存储的传播光谱发信号被预先调制基带信号(( GMSK )例如 Gaussian ，最小移动调音发信号)，它更类似于收到的传播光谱信号。而且， despreader 的错过的察觉概率比传统的的低大约一个数量级。基于最大的可能性的标准和使解调的信号的阶段概率密度功能，分析 despreaders 性能的一个新方法被提出，它被证明根据数字结果比传统的方法更精确。最后，在不同 signal-to-noise 比率下面的适应 despreader 被给。
英文摘要：
A new type of despreader for direct sequence spread spectrum signal is proposed. Compared with traditional despreaders, the new despreader does not contain hard decision ware or handle binary sequence any more, and the locally stored spread spectrum signals are pre-modulated baseband signals （such as Gaussian minimum shift keying （GMSK） signals）, which are much more similar to the received spread spectrum signals. Moreover, the missed detection probability of the despreader is about one order of magnitude lower than that of traditional ones. Based on the maximum likelihood criterion and phase probability density function of demodulated signal, a new method of analyzing the despreaders＇ performance is put forward, which is proved to be more accurate than traditional methods according to the numerical results. Finally, an adaptive despreader under different signal-to-noise ratios is given.
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