卫星通信信号调制识别技术研究

通信信号的调制方式识别是非协作通信领域的一个研究热点，它需要在没有任何先验条件，且环境复杂有噪声的条件下，不依赖于其它的先验知识，确定目标信号的调制方式。然后就可提取载频、码速率、滚降系数等参数，为信号的进一步深入研究提供依据。分析了几种经常用于卫星通信的MPSK调制信号和高阶调制信号16APSK，提出了一种基于高阶累积量与频谱特征的识别算法。在特定的数据长度和信噪比条件下，理论分析与仿真验证均验证了该算法易于实现、识别率高（≥95％）。

Satellite Communication Signals Modulation Recognition Technology

Modulation type recognition of communication signals becomes a research hotspot in the area of non-cooperative communication, which needs to identify the modulation type of the target signals without any prior knowledge and in the condition that the complex environment is noisy. Then the carrier frequen- cy, symbol rate, roll-off factor and other parameters can be extracted and the basis for further in-depth study of the signals can be provided. Some common MPSK signals for satellite communication and the higher order modulation signal 16APSK are analyzed in this article, and a recognition algorithm based on higher-order cumulants and spectrum feature is put forward. Both the theoretical analysis and simulation confirm that this algorithm is easy to realize and has a high recognition rate（I〉95%）.