International Journal on Computer Science and Technology (IJCST)
Cognitive radio is an emerging and demanding technology of wireless technology of wireless communication system. With the advancement of wireless communication, a lot of constraints on the usage of available radio spectrum take place. Manny survey of spectrum utilization shows that entire spectrum is not used at all the times. Some of the frequency bands are occupied, some of the bands are less occupied and some frequency bands are not at all occupied. Cognitive radio system is the technique to overcome the problem of under-utilization of bandwidth.