APSK信号载波相位的精同步方法(英文)

Fine carrier phase recovery method for APSK signals

对于APSK信号的精载波相位恢复,混合NDA/DD方法具有实现简单的优点,但其抖动方差比较大。为获得更好的抖动方差性能,提出了一种改进的精载波相位恢复方法。该方法基于星座分割和一种受控的非线性运算,通过星座分割充分利用APSK星座各圈信号的有用信息,而受控的非线性运算则起到最小化抖动方差的作用。仿真对比结果表明,改进方法的抖动方差性能比混合NDA/DD方法改善2 dB以上,而算法复杂度的增加有限。该算法可用于对APSK载波相位同步要求较高的场合。

For fine carrier phase recovery of amplitude and phase shift keying（APSK）signals,the hybrid non-data-aided/decision-directed（NDA/DD）method is simple to implement,but it suffers from relatively large jitter variance.To obtain better jitter variance performance,a novel fine carrier phase recovery method is proposed,which is based on the idea of constellation partitioning and a different nonlinear operation.Constellation partitioning takes full advantages of all constellation signals,and the nonlinear operation minimizes the jitter variance.This new method enhances significantly jitter performance of the hybrid NDA/DD method by more than 2 dB with only limited complexity increase.This method may be adopted in APSK receivers demanding strict carrier phase synchronization.