一种改进的符号定时恢复算法研究与性能分析

Study of A Modified Algorithm For Symbol Timing Recovery

Gardner算法是数字解调系统中常用的一种提取定时误差的算法,但Gardner算法的一个主要缺点是对限带信号会产生明显的定时抖动。本文针对Garnder算法的不足,对一种改进的算法进行研究,并以M-PSK信号为例,对整个定时恢复环路进行仿真。仿真结果显示当输入信号为M-PSK信号时,定时误差抖动明显降低,数字接收系统的性能得以明显改善。

Gardner algorithm has been widely used in software radio demodulation system, but one drawback of the Gardner algorithm is that it has significant timing-jitter for band-limited signals , based on which, we analysis a modified algorithm .Simulation was done in terms of the entire timing recovery loop and taking examples of M-PSK signals. Simulation results show that the modification leads to a better performance of the software radio receiver while the input M-PSK Signal is band-limited.