Digital PLL under Impulsive Noise Environment

摘要

DPLLs (Digital Phase-Locked Loops) are widely used for coherent digital communication systems, and play important roles in carrier and clock recoveries. In general, these DPLLs are optimized for Gaussian noise environment. However, in power line communication, the power line noise is often impulsive, and then its statistical feature is different from Gaussian one. Therefore, we introduce Mid-dleton's Class A noise model into a statistical model of impulsive noise environment. In this paper, we devise an optimum DPLL for such Class A noise environment using the technique of MAP (Maximum A Posteriori) estimating. Then we show the performance of the proposed DPLL under Class A noise environment and compare it with that of the conventional DPLL by computer simulation.