Spectrum Sensing Techniques for Cognitive Radio Networks

The demand and the usage of wireless devices are rapidly increasing day by day. The spectrum is the important resource for the wireless device. The limited availability of the resource puts a lot of constraints in the usage of the wireless spectrum. The licensed user of the spectrum can be used by the unlicensed user in the absence of the primary user in the spectrum. It is achieved with the intelligent and promising technology of cognitive radio networks. Identifying the spectrum holes is an important task in cognitive radio. It is done with the help of spectrum sensing techniques. In this paper, the concept of cognitive radio technology is discussed. The spectrum sensing techniques are presented and analyzed in detail by giving comparative study of various methodologies used for cognitive radio networks.