一种全数字高速率MPSK调制信号的载波频率估计方法

An All-Digital Method of Frequency Estimation for High Rate MPSK Modulated Signals

在高速数据传输系统中,载波恢复单元性能的好坏,直接影响着解调器的性能。为了解决高速率多相移键控(MPSK)调制信号在载波恢复过程中存在较大相位抖动的关键问题,给出了一种适用于一定多普勒变化范围的MP-SK信号的开环频率估计算法。与此同时,给出了相应的载波恢复单元的实现方法。在文章的最后,给出了该算法的仿真结果。此种算法不但可以应用于全数字载波恢复系统,也可以结合传统的锁相环应用。

In the high rate data transmission,t he performances of demodulator are a ffected directly by the performances of the carrier recovery unit.To overcome the problem of serious carrier phase jitter in the process of carrier recovery for a high rate MPSK modulated signals,the open -loop algorithms of frequency esti mation are proposed,which is suitab le for frequency changeable MPSK signal.At the same t ime,the implementation method of carrier recovery unit is also proposed.In the end of the paper,the simulation results are shown,which is based on the algorit hm.This algorithm not only can be use d for all -digi-tal carrier recovery system,but can be combined with a traditional PLL also.