基于分段抛物线滤波器的GMSK定时恢复方法

A Timing Recovery Method for GMSK Modulated Signals Based on Piecewise Parabolic Filters

基于Gardner的定时恢复能应用于GMSK的定时恢复,而且能获得较好的定时同步性能。较传统的定时恢复技术而言,Gardner定时恢复具有非数据辅助、较低的复杂度、环路结构简单等优点。在分析Gardner定时恢复环路的基础上,提出了一种改进的GMSK定时恢复方法,进一步降低了计算复杂度,简化了滤波器结构。仿真结果表明,改进的定时恢复方法不仅能使原有的定时性能有所提高,而且其结构更为简单,因此更适合GMSK系统的定时恢复。

Gardner-based timing recovery can be used for timing recovery for GMSK modulation.It performs well in timing synchronization.Compared with traditional timing recovery techniques,it has advantages such as non-data-aided,lower complexity and a simple loop structure.Based on the analysis of the Gardner timing recovery loop,we proposed an improved GMSK timing recovery method,which further reduces the complexity of calculation and simplifies the filter＇s structure.Emulation shows that the improved timing recovery method is more suitable for the GMSK system,because it has a simpler structure while improving the original timing performance.