Computer Science – Information Theory
Scientific paper
2008-02-19
Computer Science
Information Theory
To appear in the Proceedings of the 6th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Ne
Scientific paper
This paper focuses on the design of medium access control protocols for cognitive radio networks. The scenario in which a single cognitive user wishes to opportunistically exploit the availability of empty frequency bands within parts of the radio spectrum having multiple bands is first considered. In this scenario, the availability probability of each channel is unknown a priori to the cognitive user. Hence efficient medium access strategies must strike a balance between exploring (learning) the availability probability of the channels and exploiting the knowledge of the availability probability identified thus far. For this scenario, an optimal medium access strategy is derived and its underlying recursive structure is illustrated via examples. To avoid the prohibitive computational complexity of this optimal strategy, a low complexity asymptotically optimal strategy is developed. Next, the multi-cognitive user scenario is considered and low complexity medium access protocols, which strike an optimal balance between exploration and exploitation in such competitive environments, are developed.
Gamal Hesham El
Jiang Hai
Lai Lifeng
Poor Harold Vincent
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