摘要
在数字通信系统中,同步技术是非常重要的,是正确解调的前提,而位同步是最基本的同步。本文基于gardner算法,分析了采样频偏对接收信号的影响,给出了定时同步的结构和计算方法。对开环、一阶环路以及二阶环路对定时误差的影响进行了分析。通过优化二阶环路滤波器的参数,获得了对采样频偏的估计,同时使得鉴相误差相对于一阶滤波器提高了两个数量级,具有重要的工程意义。
In digital communication systems, synchronization is very important, and a premise of correct demodulation .bit synchronization is the most basic synchronization. This paper analyzes the sampling frequency offset of the received signal, the timing synchronization structure and parameter calculation method based on the Gardner algorithm, the influence of open loop, first-order loop and two order loop to the timing error are analyzed. By optimizing the parameters of two order loop filter, acquire estimation of sampling frequency, the phase error with respect to the firstorder filter is improved by two orders of magnitude, which has an important engineering significance.
出处
《科技视界》
2013年第24期81-83,共3页
Science & Technology Vision
