毕业论文-通信信号调制方式识别方法研究及仿真.doc

JIU JIANG UNIVERSITY 毕 业 论 文 题 目 通信信号调制方式识别方法研究及仿真 英文题目 Research and Simulation of modulation type identification method 院 系 电子工程学院 专 业 通信工程 姓 名 年 级 指导教师 二零零九年五月 摘 要 通信信号调制识别的目的就是截获一段通信信号在未知调制信息内容的前提下依据较少的先验信息判断出通信信号的调制方式。通信信号的调制方式识别和调制参数估计对于军用电子对抗以及民用频谱监管都具有极其重要的意义。随着通信技术的飞速发展通信信号的体制和调制样式变得复杂多样，信号环境日趋密集这使得通信信号的调制识别变得困难。近几十年来国内外学者在通信信号的调制识别方面进行了大量的探索提出了很多新方法。算法相对简单而且识别效果好的调制方式识别方案是目前调制识别领域的趋势和主流。通信信号调制类型的自动识别广泛应用于信号确认、干扰辨识、无线电侦听、电子对抗和信号监测等领域。本文首先对各种通信信号进行了理论分析，在此基础上针对数字调制信号采用了基于决策论方法的调制方式识别算法，讨论了判决门限的选择，并利用MATLAB软件进行了计算机仿真。本文的调制识别算法是基于决策论方法，该方法具有运算量小，识别效果好等优点。 关键词： 调制方式识别；数字调制；参数提取；决策论 Research and Simulation of modulation type identification method Abstract Purpose of communication modulation signals recognition is to capture a section communication signals, under the premise of no modulation information contents, bases on less prior information, judges out the modulation method of communication signals. Modulation recognition and estimation of communication signal is important for electronic warfare and spectrum policing. there is no mature porject to solve the problem of modulation recognition,because of the exist of contradiction between anti-noise performance and complexity. Along with the flying development of communication technique, the style of communication signals becomes more complex and more various. Signal environment is gradually intensive, and this condition also makes communication signals modulation recognition more difficult. Recent several decades, domestic and international scholar proceeds large quantities explore at the aspect of communication signal recognition, and acquires a lot of new recognition methods.An algorithm which is simple and of good recognition performance is the mainstream of the research. The auto identification of modulation style of