随着各种无线电技术的迅猛发展,无线电频谱资源将日趋紧张.美国联邦通信委员会报告指出,在特定的时间或者区域内超过70%的无线频谱资源处于闲置状态,提高频谱的利用率迫在眉睫.认知无线电技术可以有效解决无线频谱资源利用率低的问题,它通过频率侦听感知探测可用的频谱资源,对这些资源进行管理和协调,使用户可以使用授权用户的频段而不干涉授权用户.首先介绍IEEE 802.22技术,然后提出一种基于小波包变换的快速频率侦听算法和硬件设计方案,最后在假定的条件下对该算法进行了仿真验证,仿真结果表明该算法具有良好的性能.%With the rapid development of various wireless technologies, the shortage of frequency spectrum resource will become more serious. The Federal Communications Commission announced that more than 70％ of radio spectrums are underutilised in certain times or geographic regions,so it is urgent to improve the utilisation rate of the frequency spectrum. Cognitive radio technology can effectively overcome this problem by perceiving and detecting the available spectrum resources through spectrum interception, so that users can use the resources of the authorized users without interfering them in the way of managing and coordinating these resources. First, in this paper we introduce the IEEE 802.22 technology,and then propose a fast spectrum interception algorithm which is based on discrete wavelet packet transform and a hardware design scheme. Finally, we verify our algorithm by simulations, and the simulation results show that the algorithm has good performance.
展开▼
