一种适用于16QAM的自适应阈值载波锁定检测算法

为避免传统16阶正交幅度调制（16-Quardrature Amplitude Modulation，16QAM）载波锁定指示锁定阈值受输入信号电平的影响，提出了一种基于归一化信号高阶矩的16QAM载波锁定检测算法。针对传统基于固定阈值的检测算法在数据不满足均匀分布时失效的情况，提出了一种基于输入数据统计特性的自适应阈值载波锁定检测算法。实验结果和工程应用结果表明，所提出的自适应门限能更好地适应不同数据下的载波锁定检测。该方法已经在某卫星对接试验中得到了应用验证，取得了满意的效果。

A 16QAM carrier lock detection algorithm based on adaptive threshold

In order to avoid the influence of the input signal amplitude to locking threshold on the traditional 16-quardrature amplitude modulation(16QAM)carrier lock indication,a 16QAM carrier lock detection algorithm based on the normalized signal higher moment is proposed.For the situation that the traditional fixed threshold based detection algorithm does not satisfy the non-uniform distribution,an adaptive threshold carrier lock detection algorithm based on the statistical characteristics of the input data is proposed.The experimental results and the engineering applications indicate that the proposed adaptive threshold can better adapt to the carrier lock detection under different data.This method has been initially verified in a satellite docking test and satisfactory results have been achieved.