一种改进的数字信号调制方式自动识别算法  

A Modified Automatic Recognition Algorithm of Digital Modulation

作　　者：王长宇[1] 张国毅[1] 高运泉[1] 

机构地区：[1]空军航空大学航空电子工程系,吉林长春130022

出　　处：《宇航计测技术》2007年第2期41-44,共4页Journal of Astronautic Metrology and Measurement

摘　　要：数字调制方式的识别对于通信信号分析有着重要的作用。针对数字信号(2ASK,4ASK,2PSK,4PSK,2FSK和4FSK信号)的调制方式,提出了一种改进的数字信号调制识别算法(DMRA),并且对该算法提出了最佳门限的设置方法,使其适用于信噪比在5 dB-30 dB范围内变化的信号。该算法能够快速、自动地识别出已调数字信号的调制方式。计算机仿真表明:当噪声采用高斯白噪声,该算法在信噪比不低于7 dB时,对实际信号的识别正确率不低于92%。Identification of digital modulation schemes plays an important role in signal analysis. Presents a modified automatic recognition algorithm of six kinds of digital modulation types such as 2ASK, 4ASK, 2PSK, 4PSK, 2FSK, and 4FSK, puts forward the constitution of the best threshold which is applicable to the signal that changes within the scope of the signal to noise rate （SNR） 5 dB - 30 dB. It is opinion that the modified algorithm operates rapidly and reliably in automatic recognition of communication signal and its performance has been evaluated by simulating different types of bind-limited digital signals corrupted by white Gaussian noise. It is found that the overall success rate is not lower than 92% when SNR is over 7 dB.

关 键 词：数字调制 特征参数 识别 算法 

分 类 号：TN914.3[电子电信—通信与信息系统]