Cognitive Radio

Abstract

Day by day, there is increasing demand for high data rates it causes lack of radio spectrum for the new emerging technologies in the area of wireless communications. So, it is, must use spectrum efficiently, i.e. proper spectrum management. Spectrum management is responsible for the spectrum deficiency. In case of spectrum management it is must to accurate determination of the present licensed users. The Cognitive radio is a type of wireless communication. In this a transceiver can intelligently detect which communication channels are in active and which is inactive. As soon as it detects an unused channel it instantly move into vacant channels by avoiding busy channels. This results in optimization of the use of available radio-frequency spectrum with minimization of interference to other users. This paper includes the scenarios related to cognitive radio in wireless communication. It also focuses on primary user emulation attack with the maximum likelihood detector for various channels like AWGN, Rayleigh. Various evaluations are carried out to check the performance of cognitive radio with the help of MATLAB.