一种改进型APSK盲定时误差估计算法

针对幅度相移键控(amplitude phase shift keying,APSK)信号的复杂性和特殊性,基于经典Gardner位定时同步环路中各功能模块,采用改进型Gardner算法设计了一种含有预滤波处理的定时环路。通过计算机仿真比较评估了经典环路和改进环路的误差检测与收敛性能,仿真结果表明所设计的定时环路较好地实现了APSK信号的盲定时同步,且在相同环路带宽条件下可以改善星座图收敛速度和定时误差抖动性能。

A modified blind timing error estimation algorithm for APSK

Considering the characteristics with complexity and specificity for amplitude phase shift keying signal, basing on the classical Gardner function module and a modified Gardner method, a bit timing synchronization loop including with pre-filter is designed in this paper. The performance comparing and estimation of error estimating and convergence is simulated, the simulating results shows that the designed timing loop can complete the blind timing synchronization of APSK signal, and improve the performance of constellation convergence speed and timing error jitter.