一种新的数字信号调制式盲识别算法  

A New Modulation Blind Recognition Algorithm of Digital Signal

作　　者：黄付庆[1,2] 程剑俐[1] 任国春[1] 徐以涛[1] 

机构地区：[1]解放军理工大学,南京210017 [2]重庆通信学院,重庆400035

出　　处：《舰船电子对抗》2008年第6期78-82,共5页Shipboard Electronic Countermeasure

摘　　要：现有的调制识别算法多应用到信号的瞬时频率和瞬时相位信息,而瞬时频率和瞬时相位的提取需要载频、码元速率等先验信息,载频的偏差限制了其识别性能的进一步提高。基于此,提出了一种仅依靠信号瞬时幅度信息进行盲识别的新算法,该算法不需要任何先验信息,介绍了一种对MFSK和MPSK信号非常有效的瞬时频率的近似提取法,然后选择特征量对调制类型进行分类识别,最后进行计算机仿真,仿真结果表明该算法识别性能良好,对载频偏差不敏感,有着很好的稳定性。The known modulation recognition algorithms mostly use the instantaneous frequency and phase information of signals, but extracting the instantaneous frequency and phase needs the previous information of carrier frequency and code velocity, etc. , the carrier frequency errors have limited the further improvement of recognition performance. Based on this, this paper presents a new blind recognition algorithm only depending on the instantaneous amplitude information of signals, this algorithm need not any previous information, introduces an approximate extraction method of the instantaneous frequency,which is effective for the MFSK and MPSK signals,then adopts the feature parameters to classify and recognize the modulation types, lastly simulates it by computer, and the simulation result shows that the algorithm has a good recognition performance and is insensitive to the carrier frequency error, then has good stability.

关 键 词：调制识别 近似算法 特征量提取 决策树 

分 类 号：TN911.7[电子电信—通信与信息系统]