基于多天线接收机的信号调制方式识别  

Modulation classification based on multi-antenna receiver

作　　者：程汉文[1,2] 吴乐南[1] 

机构地区：[1]东南大学信息科学与工程学院,南京210096 [2]防空兵指挥学院,郑州450052

出　　处：《信号处理》2009年第2期260-263,共4页Journal of Signal Processing

摘　　要：针对存在未知载波频偏(CFO)的线性调制分类,提出一种混合似似然比检测(qHLRT)分类器。并且通过使用多天线接收机来进一步增强分类性能。一种基于盲源分离技术的CFO估计器用于qHLRT分类器中,同时对不同天线支路的相移作出估计。针对AWGN信道M进制QAM信号进行仿真,结果显示带有该估计器的qHLRT分类器可以有效降低未知CFO的影响,利用空间分集可以进一步提高分类器性能。A quasi-hybrid likelihood ratio test （qHLRT） classifier is proposed for linear modulation classification,with unknown carrier frequency offsets （CFO）. And a multi-antenna receiver is utilized to further enhance the classification performance. A blind CFO estimator based on blind source separation technique, which meantime estimates phase shift of each of antenna branches, is added to qHLRT classifier. Simulation results presented for classification of M-ary QAM signals under AWGN channel show that the qHLRT clas- sifier with estimator here proposed offers an efficient way to combat the sensitivity to unknown CFO, and the performance can be further improved by spatial diversity.

关 键 词：似然比检测 调制识别 频偏估计 天线 

分 类 号：TN911.72[电子电信—通信与信息系统]