MPSK 信号判决预测载波相位估计

Decision prediction carrier phase estimation in MPSK transmission

为解决在采用相干检测的数字通信中，参考载波的同步这一关键问题，给出了一种适用于多相移键控（ＭＰＳＫ）信号、能够校正较大频偏的载波相位估计算法。该算法能够捕捉的频偏可达符号速率的１／２（能跟踪的频偏范围远比这个范围要大）；在此范围之内，载波同步性能几乎与频偏无关。由于该算法要求发送数据的帧结构中包含用于初始同步训练序列，故而该算法更适合于突发工作方式。以正交移相键控（ＱＰＳＫ）信号为例，详细讨论了该算法的性能，并给出了计算机仿真的结果。

In digital transmission with coherent detection, the recovery of the carrier reference phase is a key aspect. This paper presents a carrier recovery algorithm which has the ability of estimating and correcting large frequency offset for M ary phase shift keying (MPSK) transmission. The range of frequency offset of this algorithm can estimate and correct is a half of the symbol rate, and in this range the estimation performance almost doesn't worsen. This algorithm is more suitable for burst mode transmission, since some preambles is required before formal data in the transmission frame. As an example, the case of differencial quadrature phase shift keying (DQPSK) is examined by means of computer simulation emphatically.