一种改进的Gardner定时恢复算法研究

An Improved Gardner Timing Recovery Algorithm

为了提高基于Gardner算法的定时同步系统的性能,采用Matlab和Simulink对该算法进行建模和仿真,针对定时同步环路中能够影响环路等效带宽的环路滤波器,提出了一种在定时同步的捕获和跟踪阶段具有不同等效带宽的环路滤波器结构,从而在缩短定时捕获时间的同时提高了跟踪阶段的同步精度(即减小了定时抖动)。通过与经典Gardner定时恢复算法的对比分析,验证了该结构的有效性。

In order to improve the performance of the timing synchronization system based on the Gardner algorithm, Matlab and Simulink was used to model and simulate the algorithm and a new structure of loop filter, which has different equivalent bandwidths during the acquisition and tracking periods under the condition of timing synchronization, has been proposed in particular, so as to shorten the capture time while improving the tracking accuracy of the synchronization （ i. e. , reducing the timing jitter）. The ef- fectiveness of the structure was therefore validated by analyzing and comparing with the classical Gardner timing recovery algorithm.