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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-speed data transmission system, the performance of the carrier recovery unit has a direct impact on the performance of the demodulator. In order to solve the key problem of large phase jitter in MPSK modulated signal during carrier recovery, an open-loop frequency of MP-SK signal which is suitable for a certain Doppler shift range Estimation algorithm. At the same time, the corresponding method of carrier recovery unit is given. At the end of the article, the simulation results of this algorithm are given. This algorithm can be applied not only to all digital carrier recovery systems, but also to traditional phase-locked loop applications.