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抖动环是在扩展频谱通信接收机中用作 PN 码位同步的一种跟踪环路。本文考虑了这种环路中固有的相关自噪声、调制自噪声及抖动自噪声,明确了它们的影响可被忽略的条件。分析加性高斯噪声引起的跟踪误差是本文的主要论题。通过分析得到了关于跟踪误差的方差的近似表达式。它在相对抖动幅度△T/Tc≤1/2的情况下均成立,而以前的文献只讨论了△T/Tc=1/2的情况。本文的结果可作为这种环路设计的依据。
A dithered loop is a tracking loop used as a PN code bit synchronization in a spread spectrum communication receiver. This paper considers the inherent self-noise, self-noise and jitter self-noise inherent in this kind of loop, making it clear that their effects can be neglected. Analyzing the tracking error caused by additive Gaussian noise is the main topic of this paper. The approximate expression about the variance of tracking error is obtained through the analysis. It is true when the relative jitter amplitude ΔT / Tc≤1 / 2, while the previous literature only discussed the case of ΔT / Tc = 1/2. The results of this paper can be used as the basis for this loop design.