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在认知无线电系统中,认知设备需要不断的对频谱进行感知。文章对频谱感知技术做了分析,介绍了能量感知、基于正交扁长椭球序列多窗估计的感知、基于循环谱理论的感知,以及进一步改进感知效果的方法——协同感知。其中,能量感知估计性能一般,基于正交扁长椭球序列多窗估计的感知和基于循环谱理论的感知相对较好。协同感知是感知技术的发展方向之一,有着广泛的应用前景。
In cognitive radio systems, cognitive devices need to constantly sense the spectrum. In this paper, we analyze the spectrum sensing techniques, and introduce the methods of energy perception, multi-window estimation based on orthogonal prolate spheroids, perception based on cyclic spectrum theory, and the method of further improving perceptual effect. Among them, the performance of energy-aware estimation is generally good, and the perception based on multi-window estimation of orthogonal prolate spheroid sequences and the perception based on cyclic spectrum theory are relatively good. Collaborative perception is one of the development directions of perception technology and has a wide range of application prospects.