A comprehensive study of spectrum sensing techniques in cognitive radio networks
Ahmed M. Jasim, Haidar N. Al-Anbagi · 2017
Frequency spectrum scarcity has been a strong research motivation. Those researches have focused on developing methodologies to utilize frequency spectrum as much as it could be. Meanwhile, this spectrum utilization and its great revenue should not affect the quality of services being provided by network providers. In most cases, statistics have shown that only quarter of the spectrum is well utilized. Therefore, regulated authorities, which are in charge of organizing the access to the frequency spectrum, have proposed a strategy to share the already allocated spectrum band with the unlicensed users based on the appearance, or not, of the licensed users. This concept of vertical spectrum sharing is called cognitive radio (CR). Spectrum scarcity, dynamic spectrum access, and the cognitive radio networks (CRNs) are comprehensively investigated in this study. Furthermore, this study deeply examines the spectrum sensing of cognitive radio network providing an idea of this important technology and the challenges it may face.