基于二阶循环统计量的频谱感知方法

认知无线电可以自动感知周围环境并能调整系统参数，以适应环境的变化，是一种新的智能无线通信技术，而有效可靠的频谱感知技术是认知无线电得以发展的关键和前提。该文通过对基于二阶循环统计量检测方法的综合分析和研究，将该方法应用到认知无线电频谱空洞的检测当中，给出了利用二阶循环统计量实现对授权用户检测的具体实施方案。仿真试验结果表明，基于二阶循环统计量的频谱感知方法具有良好的检测性能，能够有效地完成对授权用户的检测。

Spectrum sensing based on second-order cyclic-cumulant

Cognitive Radio is a new intellectual wireless communication system which can sense surroundings automatically and regulate system parameter to adapt to environment. Effective spectrum sensing method is the prerequisite to develop cognitive radio. This paper analyzes the principle and performance of this method, applies the detection method based on cyclic-cumulant to detect spectrum hole, and gives the specific implementation process of using the second-order cyclic-cumulant to detect the primary user. The result shows that this spectrum sensing method based on the second-order cyclic-cumulant has good performance in low SNR condition. It can accomplish effective detection to primary user.