一种改进的MQAM信号调制方式识别算法  

An Improved Recognition Algorithm for The Modulation Mode of MQAM Signals

作　　者：刘晓斌[1] 李程[1] 张文明[1] 

机构地区：[1]国防科学技术大学,长沙410073

出　　处：《舰船电子对抗》2013年第6期42-45,共4页Shipboard Electronic Countermeasure

摘　　要：传统的多进制正交幅度调制信号调制方式的识别方法,是对信号的星座图进行减法聚类,通过得到的聚类中心个数确定调制阶数,从而完成识别。由于信号的数据长度及聚类半径对识别性能的影响很大,为降低一定数据长度下聚类半径对识别效果的影响,提出了结合减法聚类和最大似然估计理论的改进识别方法,并给出了识别流程。仿真结果表明,在一定条件下,改进算法对信噪比的要求低于传统方法约6dB。Traditional modulation lation signals is to perform sub modulation order according to th mode tration recognition method of multiple quadrature amplitude modu clustering to signal constellation picture, determines the e number of fetched clustering centers,then the recognition is fin- ished. Because the data length and clustering radius have great influence on recognition capacility, in order to reduce the influence of clustering radius on recognition effect under definite data length, this paper presents an improved recognition method combining subtration clustering and maximum likelihood estimate theory, and gives the recognition flow. The simulation result shows that the sig- nal to noise ratio requirement of the improved algorithm is 6 dB less than that of traditional meth- od.

关 键 词：调制方式识别 星座图 聚类分析 最大似然估计 

分 类 号：TN975[电子电信—信号与信息处理]