A review on cognitive radio networking and communications

Cognitive radio (CR) is the technology that enables dynamic spectrum access, a strategy that solves the spectrum shortage issue that many nations face. With cognitive radio networks, the spectrum sensing issue has taken on new dimensions. In wireless communication, the radio spectrum is the most precious resource. Cognitive radio and cognitive-based networking are converting static spectrum allocation communication systems into dynamic spectrum allocation communication systems. Cognitive radios are cognitive devices that can detect external circumstances and adjust their settings to provide the best possible performance at individual nodes or at the network level. As a result, CR is generally considered as one of the most promising wireless communication technologies of the future.