QAM信号星座图识别及相偏估计新算法

A New Approach to QAM Constellation Identification and Phase Offset Estimation

提出了一种新的QAM信号星座图调制识别算法.该方法在Radon变换基础上采用能量峰值和最小熵值检测的方法估计星座图的固定相偏,并通过检测相应的Radon变换的波峰数估计星座图的阶数。仿真结果表明,新算法可以有效区分具有固定相偏的(4,16,32,64,128,256,1024)QAM信号星座图,且识别性能较好.

This paper proposes a new algorithm for QAM constellation identification.Based on Radon transformation,the fixed phase offset of the constellation can be estimated via the position of the peak energy or the entropy.And the constellation type can be estimated via the peak number of the corresponding Radon transformation.The simulation results show this new method can identify (4,16,32,64,128,256,1024)-ary QAM constellation with fixed phase offset effectively with satisfactory performance.