一种改进的数字信号自动调制识别算法  

Improved Automatic Modulation Recognition Algorithm for Digital Signals

作　　者：黄勇[1] 李朝海[1] 安琦[1] 夏威[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都611731

出　　处：《电子质量》2012年第10期1-3,7,共4页Electronics Quality

基　　金：中央高校基本科研业务费专项资金项目(ZYGX2010J020);四川省科技支撑计划项目(2010GZ0149)

摘　　要：在非协作通信中,要对截获的信号进行解调以获取其信息,必须首先识别出信号的调制样式。在对六种数字信号的自动调制识别中,由于对瞬时相位求差分直接获得的瞬时频率存在很大的误差,使用了一种频率估计方法对其进行平滑处理;由于噪声对信号幅度的干扰很大,严重影响ASK2和ASK4的区分,对识别算法进行了改进。仿真实验证明,当信噪比为10dB时,对六种信号的平均正确识别率达到99.71%。In the non-cooperative communication,to receive and demodulate a communication signal so as to get its information,it is necessary to determine its modulation type.In the automatic modulation recognition for six digital modulation type signals,because the instantaneous frequency getting by the nu- merical differentiation of instantaneous phase exists big error,a frequency estimation method was used to smooth it;because the noise does great interference to the signal amplitude,which badly influences the discrimination between ASK2 and ASK4,the recognition algorithm was improved.When the SNR is lOdB, the average recognition rate of the six signals reaches 99.71%.

关 键 词：非协作通信 数字调制识别 瞬时频率误差 幅度干扰 

分 类 号：TN911.72[电子电信—通信与信息系统]