Constellation recovery and modulation recognition for multiple quadrature amplitude modulation signals

被引：0
|
作者：
Lu S. [1 ,2 ]
Wang W. [1 ]
Wang G. [1 ]
机构：
[1] College of Electronic Science and Engineering, National University of Defense Technology, Changsha
[2] State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System, National University of Defense Technology, Changsha
来源：
Guofang Keji Daxue Xuebao/Journal of National University of Defense Technology | 2016年 / 38卷 / 03期
关键词：
Constellation diagram; Maximum likelihood; Modulation recognition; Offset estimation;
D O I：
10.11887/j.cn.201603022
中图分类号：
学科分类号：
摘要：
An algorithm for modulation recognition of multiple quadrature amplitude modulation signals based on constellation recovery was proposed. Firstly, parameters of the carrier frequency and signal to noise ratio were estimated from its spectrum. According to the baud rate and the symbol timing, the baud rate sampling was finished. Then a non-data-aided carrier frequency offset estimation method was used to mitigate the effect of frequency offset and phase offset in constellation recovery. Finally, the modulation type was recognized by the average likelihood ratio test method. Simulation results demonstrate that the proposed algorithm has a better recognition performance when comparing with the amplitude-based maximum likelihood algorithm. © 2016, NUDT Press. All right reserved.
引用
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页码：130 / 134
页数：4
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