一种全数字定时同步方法的改进

An improvement of an all digital timing recovery algorithm

在滚降系数α较小时，平方器加数字滤波提取定时算法估计的定时信息存在方差较大的缺点．为了改进性能，在信号被平方前，用带通滤波器对信号进行过滤．模拟结果表明，当滚降系数较小时，性能有很大的改善．

The digital algorithm of timing recovery which uses the square circuit and digital filter has the shortcoming that the variance of the estimated phase is relatively large when the roll off factor α is small. To improve its performance, before the signal is squared, it is filtered by a bandpass filter. Simulation shows that the performance has been greatly improved when the roll off factor α is small.