Cognitive Radio Technology Cooperative Spectrum Sensing

Abstract

With the recent boom in the cellular networks, and personal wireless technologies, the frequency spectrum have become crowded . The most important technology that will be used to overcome this crowdness of the spectrum is the cognitive radio technology, this technology will automatically, and dynamically enable access to radio frequencies. In this thesis the cognitive radio spectrum sensing techniques are presented which are the key feature for cognitive radio networks. its main objective is to provide more spectrum access opportunities to cognitive radio users without interfering with the operations of the licensed network. The Interference Temperature Access Technique Model (ITM) was investigated which is the viable approach for dynamic spectrum access, that will control the use of the spectrum use, and define the occupancy and availability of a channel. Finally the NS2 software was used for the simulation of cognitive radio mesh network. In the simulation the assignment of the channels was based on the numbers of the available channels and the priority of the cognitive radio node which led to better utilization of available spectrum.