中文摘要：

认知无线电的首要任务是动态、可靠地检测无线电频谱环境。因此，每个认知无线电终端必须具有频谱检测的功能。文章在简述认知无线电频谱检测技术的基础上，提出了基于滤波器组的频谱检测方案，详细描述了多相滤波器组的设计方法和功率谱估计算法，并在加性高斯白噪声环境下进行了仿真。仿真结果表明，在恰当设置判决门限的情况下基于滤波器组的认知无线电频谱检测具有良好的性能。

英文摘要：

The key problem in cognitive radio network is how to detect the radio spectrum dynamically and reliably. Accordingly, each cognitive radio node has to be equipped with a spectrum analyzer. This paper first analyzes the spectrum sensing technologies used in cognitive radio, and then proposes a new spectrum sensing method based on filter banks. The implementation method of the polyphase filter banks and the algorithm of power spectral density are discussed. The experiment is studied in the adding white Gauss noise channel. Simulation results show that the proposed spectrum sensing method is of excellent performance in detection precision by choosing the proper detection threshold.