A Modified Loop Filter Design for Digital Symbol Synchronizer

A modified loop filter structure for symbol synchronizer with reduced timing jitter is proposed. A moving average unit (MAU) is added to the traditional proportional-integral (PI) structure to form the modified loop filter. Since the variance of the noise is limited under the average operation, timing jitter is reduced efficiently. Furthermore, the structure is easy for implementation, which requires only one more multiplier, several adders and registers compared to the traditional structure.