Free-band detection from spectrum sensing and analysis

In cognitive radio networks, unused frequency detection plays a crucial role in the discovery of spectrum opportunities for secondary systems (or unlicensed systems). The performance of unused spectra is characterized by both accuracy and efficiency. Currently, significant research effort has been made on improving the sensing accuracy. Several efficient techniques include energy detectors, feature detectors, and cooperative sensing. In these schemes, either one or multiple secondary users (SUs) perform sensing on a single channel during each sensing period. This strategy on simultaneously sensing a single channel by several SUs may limit the sensing efficiency to a large extent. In this work a system is developed to sense frequency bands and detect free bands in it.