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本文运用 Fokker-Plnack 方程对用于扩展频谱通信细同步的高增益二阶时延锁定环(DLL)的稳态跟踪性能进行了理论分析和计算。结果表明:高增益二阶 DLL 同步误差的稳态概率分布与一阶 DLL 具有相似的形式;在两者同步误差的方差相等的情况下,高增益二阶DLL 所需要的归一化数据信噪比比一阶 DLL 低10log(1+1/4ξ~2)(dB)。尽管本文只分析了这种码环(DLL),但其分析方法也适用载波环,文中的结果可作为设计 DLL 时参考。
In this paper, the Fokker-Plnack equation is used to theoretically analyze and calculate the steady-state tracking performance of the second-order delay-locked loop (DLL) with high gain for spread spectrum communication. The results show that the steady-state probability distribution of the high-gain second-order DLL synchronization error is similar to that of the first-order DLL. When the variance of the two synchronization errors is equal, the normalized data signal noise Lower than the first order DLL 10log (1 + 1 / 4ξ ~ 2) (dB). Although this paper analyzes only this code ring (DLL), but its analysis method also applies to the carrier ring, the results of the paper can be used as a reference when designing the DLL.