一种改进的符号定时恢复算法研究与性能分析  

Study on Modified Algorithm For Symbol Timing Recovery

作　　者：郑皓[1] 覃涵宇[1] 邹晓清[2] 

机构地区：[1]中国人民解放军通信指挥学院,湖北武汉430010 [2]中国人民解放军空军雷达学院,湖北武汉430000

出　　处：《软件导刊》2008年第9期57-59,共3页Software Guide

摘　　要：Gardner算法是数字解调系统中常用的一种定时误差提取算法,但该算法的一个主要缺点是会产生定时抖动。针对Garnder算法的不足,对一种改进的Gardner算法进行了研究,并在自噪声性能及系统误码率方面和Gardner算法进行比较。仿真结果表明,当系统接收的是QPSK信号时,在!=0.25,等效噪声环路带宽BLT=0.005时,使用改进的算法,定时抖动会明显降低,系统误码率也得到很大的改善。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 results show that the modified method has an advantage over the self-noise reduction for M-PSK signals with small value of M. The self-noise is greatly reduced for QPSK signal with the roll-off factor of 0.25 and the normalized noise-equivalent loop bandwidth of 0.005, the biterror rate of the system is reduced too.

关 键 词：符号同步 改进的Gardner算法 定时误差 

分 类 号：TP312[自动化与计算机技术—计算机软件与理论]