基于信号频域特征实现位定时恢复

Implementation of Bit Timing Recovery Based on Signal Frequency Domain Characteristics

数字通信系统对接收信号进行采样时,如果存在位定时误差,则会严重影响通信系统的工作性能。而采样信号的变换域相位谱中包含位定时误差信息,只要有效地恢复该误差信息,即可以很好地实现通信系统的位定时同步。在此基础上,对频域检测位定时估值算法的原理和实现过程进行了较详细的描述和分析,最后,针对几种典型信号对算法的性能进行了仿真研究,仿真结果表明,该算法对几种典型信号都有效,具有较广泛的适应性。

When digital communication system is sampling received signals,if there is bit timing error,communication system per- formance will be severely affected. Although the transform-domain phase spectrum of sampled signal includes bit timing error information,an effective recovery will still realize the timing synchronization of communication system in a good way. Therefore, the author described and analyzed the theory and implementation of bit timing estimation through frequency-domain detection in details and conducted algorithm simulations on several typical signals.Simulation indicated that the algorithm works on those typical signals and has a wide adaptivity.