随着无线通信技术的飞速发展,无线资源频谱日趋紧张。而另一方面固定频谱分配政策导致频谱使用率低下,为克服这一缺点,人们提出使用认知无线电技术实现动态频谱接入,从而有效利用频谱空穴。频谱感知是认知无线电的关键技术。论文中主要介绍了三种频谱检测方法:匹配滤波器检测、能量检测和循环平稳检测,分析比较了它们的优缺点。 With the rapid development of wireless communication technology, the spectrum of wireless resources is becoming increasingly tense. On the other hand, the fixed spectrum allocation policy leads to low spectrum utilization. To overcome this disadvantage, it is proposed to use cognitive radio technology to achieve dynamic spectrum access, thereby effectively utilizing spectrum holes. Spectrum sensing is the key technology of cognitive radio. The thesis mainly introduces three kinds of spectrum detection methods: matched filter detection, energy detection and cyclic stationary detection, and analyzes their advantages and disadvantages.