中文摘要：

认知无线电是一种能感知周围通信环境从而改变发射机在特定的参数上实时改变的智能通信系统。它采用动态频谱管理来提高频谱利用率，高可靠性的频谱感知是实现频谱共享的关键技术。文中利用通信系统中调制信号的二阶循环平稳性对频谱感知技术的循环特征检测法进行了较深入的研究，并与能量检测法做了比较。最后由仿真结果可得出该检测方法的优越性。

英文摘要：

Cognitive Radio is an intelligent communicational system which can sense the surroundings and thus make real-time change on some parameters of the transmitter. It improves the rate of the utilization by managing the spectral spectrum dynamically. In this paper, cyclic-feature detection of the spectrum sensing technology is studied by using the second-order cyclostationarity of the modulated signal in the communication system. And its comparison with energy detection is also described. Finally simulation results are presented to confirm its excellent performance.