Hakan Murat Karaca

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Cognitive radio is an emerging technique to improve the utilization of radio frequency spectrum in wireless communication networks. That is, spectrum efficiency can be increased significantly by giving opportunistic access of the frequency bands to a group of cognitive users to whom the band has not been licensed. In this paper, as a cross layer application(More)
Cognitive radio (CR) is an emerging technique to improve the utilization of radio frequency spectrum in wireless communication networks. In this paper, we consider the problem of throughput maximization of spectrum allocation in cognitive radio networks. Furthermore, with increasing power level of secondary transmitters, primary receivers are affected by(More)
In this paper, first, we give an overview of graph theory. We investigate various applications of graph theory and then classify them based on 7 layers of OSI (Open Systems Interconnection). Most of its applications are related to coloring problem and to make proper channel assignment which is Media Access Control layer application. Other applications can(More)
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