No abstract

In today's era, there is rapid increase in use of wireless technologies. The main backbone of wireless technology is radio spectrum. As radio spectrum is allocated to the fixed users due to which it becomes sometimes underutilized and sometimes scarce. To efficiently use the spectrum bands, Cognitive radio (CR) technology was developed which adapts to the real-time changes in the parameters without causing any interference to other networks. Cognitive radio network helps to allocate the bands to the unlicensed users too when they are not used by the fixed (licensed) users. This paper gives an overview of the CR networks.