Fast spectrum sensing algorithm for 802.22 WRAN Systems

As the wireless communication services grow quickly, the seriousness of spectrum scarcity has been on the rise gradually. Recently, the FCC (Federal Communications Commission) announced very interesting reports. It pointed out that more than 70 % of radio spectrums are underutilized in certain times or geographic locations. This means that spectrum scarcity is not due to fundamental lack of spectrum but wasteful static spectrum allocations. In this context, IEEE 802.22 WG (working group) was organized in November 2004. Since it is originated by the secondary spectrum usage approach, its critical technology is spectrum sensing not to interfere with licensed users. Thus, in this paper, we propose the fast spectrum sensing algorithm based on the discrete wavelet packet transform focusing on the coarse detection. By simulations and complexity analysis, we verify our algorithm