Review Paper on Cognitive Radio Networks

Now a days the telecommunication systems have been concerned as a required for a life, the number of users are improved therefore the usage of spectrum are increased. From many different studies and researches very bad utilizations of spectrum were found. To solve it cognitive radio network is introduced in order to dynamic the spectrum therefore to increase the spectrum efficiency, decreasing costs and increasing number of wireless users, cognitive radio network solved bad utilizations and in advance it improved more characteristics for the spectrum. The goal of this paper is to identify along with clearly describe the concept of cognitive radio networks.