IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
A novel cognitive radio spectrum assignment scheme for maximizing system utilization
Jung-Chieh Chen
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2011 Volume 8 Issue 7 Pages 472-477


This paper deals with the problem of spectrum sharing among primary and secondary users in a cognitive radio. To use the spectrum efficiently and flexibly, the cognitive radio spectrum allocation problem was formulated as a graph coloring problem (GCP). However, GCP is known to be a nondeterministic polynomial-time (NP)-hard and cannot be solved for the practical system. Inspired by the efficiency of the cross-entropy (CE) method for finding near-optimal solutions in huge search spaces, this paper proposes the application of the CE method to allocate cognitive radio spectrum to achieve near-optimal spectrum utilization. Simulation results show that the average reward values obtained using the proposed CE method are better than those obtained using the conventional method.

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© 2011 by The Institute of Electronics, Information and Communication Engineers
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