1、 无线电信号调制方式识别技术研究无线电信号调制方式识别技术研究 A Study on the Modulation Mode Recognition for Wireless Signals 学 院（系）： 信息与通信工程学院 专 业：电子信息工程（英语强化） 无线电信号调制方式识别技术研究 - I - 摘 要 在通信领域，为有效提高信道利用率，常采用调制技术来实现基带信号到频带信号 的变换。调制识别是在先验知识有限及有噪声干扰的前提下，对采集到的信号进行有效 的调制方式识别的技术，是通信信号分析过程中一个至关重要的环节。近年来，伴随通 信技术日新月异的发展，调制技术也日趋向多元化和复杂化发展
2、，这为调制识别带来新 的挑战，对在多种调制信号并存的复杂环境下的调制识别提出了更高的要求。 在了解归纳当前研究背景及实际应用发展的前提下，本文研究了基于调制信号的瞬 时特征及高阶累积量特征的识别算法，将调制识别的整个流程在 MATLAB 环境下进行 了仿真与实现。在分类器的选择上本文采用决策树分类器，基于对不同调制信号的不同 特征值的分析比较，并在考虑减少计算量的前提下，合理设置了不同的判决点与判决门 限。 仿真结果表明，基于瞬时特征的识别算法在信噪比为 10dB 以上时有着较为理想的 识别率；基于高阶累积量的识别算法则能有效地削减噪声的干扰，在信噪比较低时也有 着很好的识别率。 关键词：调制
3、识别；瞬时特征；高阶累积量；决策树分类器； 无线电信号调制方式识别技术研究 - II - A Study on the Modulation Mode Recognition for Wireless Signals Abstract In the field of communication, the modulation technology is used to realize the conversion from the baseband signal to the frequency band signal to increase the use rate of channel e
4、fficiently. Modulation recognition is the technology to recognize the modulation type of the collected signals validly, with limited prior knowledge and noise interference, it is a very important process during the analysis of communication signals. In recent years, with the fast development of comm
5、unication technology, modulation technology also gets more complex, while this puts forwards higher requirements for modulation recognition under complex circumstances with signals of kinds of modulation types. After the understanding and collection of the current research background the development
6、 of actual use, this paper studies the modulation recognition algorithms based on the instantaneous characteristics of signals and high order cumulant characteristics of signals, and make simulation and implementation of the entire process of modulation recognition under Matlab environment. In the choice of classifier this paper chooses the decision tree classifier, with the analysis of the value of different characteristics of different modulation signals, and considering the reducing
