一种全数字接收机的定时同步与载波大频偏估计方法设计与实现

Design and implementation of a method for timing synchronization and large frequency offset estimation in all digital receiver

文章根据实际需求采用了先校正频偏然后再进行定时同步的方法。其中,频率估计采用了分段FFT相位差法,该方法不需要位定时辅助,可以对大频偏进行估计;定时同步采用了便于工程实现的Gardner定时同步环,插值器选用了结构简单插值精度高的三角函数内插法。

According to the actual needs, this paper adopts a method that frequency offset correction firstly and thcn timing synchronization. In this casc, the frcquency estimation adopts the scgmcnted FFT phase difference method, which can work with no timing synchronization aid, and can estimate the large frequency offsct. The timing synchronization adopts the Gardner timing synchronization loop, which is easy to be cngineering realized. The interpolator selects the trigonometric polynomial interpolation, which has a simple structure and high intcrpolation accuracy.