Influence of data modulation and Doppler effects on the performance of a delay locked loop

U. Bernhard
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引用次数: 2

Abstract

The influence of Doppler effects on the tracking performance of a noncoherent second-order delay-locked loop (DLL) operating on a data modulated signal is investigated. For the performance analysis the author considers the tracking accuracy (steady state error and jitter) of the linear DLL and the reliability of the nonlinear loop. The nonlinear analysis concerning the loop reliability makes use of an asymptotic expansion for the mean exit time (mean time to lose lock, MTLL) which has been derived by applying the singular perturbation method. In particular, the author gives optimal loop parameters and the optimal bandwidth of the bandpass filter in the loop arms to achieve a maximum MTLL. Due to Doppler effects the optimal loop parameters are rather different using either linear or nonlinear analyses.<>
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数据调制和多普勒效应对延时锁相环性能的影响
研究了多普勒效应对工作在数据调制信号上的非相干二阶延迟锁环跟踪性能的影响。在性能分析中,作者考虑了线性动态链接库的跟踪精度(稳态误差和抖动)和非线性回路的可靠性。关于回路可靠性的非线性分析利用了用奇异摄动法得到的平均退出时间(平均失锁时间,MTLL)的渐近展开。特别地,作者给出了环路的最佳参数和环路臂中带通滤波器的最佳带宽,以实现最大MTLL。由于多普勒效应,线性分析和非线性分析的最优回路参数有很大不同。
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