基于相位旋转和帧头检测的16APSK相位模糊纠正算法

摘要

A simple phase ambiguity correction algorithm combining phase rotation and frame header detection is proposed for resolving the multiple phase ambiguity problem of 16APSK signal carrier synchronization.The phase ambiguity problem of 16APSK signal carrier synchronization is briefly introduced,and the mathematical derivation and analysis are carried out.For the proposed algorithm,firstly the phase ambiguity of 16APSK signal is reduced from 12-fold to 4-fold depending on the angle calculation and phase rotation calculated by CORDIC algorithm,then the 4-fold phase ambiguity is corrected by the header detection technique,finally the corrected constellation diagram and decoded data are obtained.In order to verify the feasibility of the proposed algorithm,it is implemented and tested on FPGA.The test results show that the proposed algorithm can correctly resolve the multiple phase ambiguity problem of 16APSK signal carrier synchronization.%针对16APSK信号载波同步的多重相位模糊问题,提出了一种简单的结合相位旋转和帧头检测的相位模糊纠正算法.对16APSK信号载波同步的相位模糊问题做了简要介绍,并进行了数学推导和分析.提出的相位模糊纠正算法,首先利用CORDIC算法进行角度计算和相位旋转,把16APSK信号的12重相位模糊降低到4重相位模糊,接着利用帧头检测技术对4重相位模糊进行纠正,最终得到正确的星座图和解码数据.为了验证算法的可行性,在FPGA上对提出的相位模糊纠正算法进行了实现和测试,测试结果表明,提出的算法能够正确纠正16APSK信号载波同步中的多重相位模糊问题.