Mobility

Cooperative Spectrum Sensing and Spectrum Sharing in Cognitive Radio: A Review

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Executive Summary

Cognitive radio is a transforming and revolutionary technology that represents a paradigm shift in the design of wireless systems, as it allows agile and efficient utilization of the radio spectrum by offering the ability of radio sensing, self-adaptation, and dynamic spectrum sharing. In this paper the use of cooperative spectrum sensing in cognitive radio systems to enhance the reliability of detecting primary users is discussed and also cooperative communications for spectrum sharing in a cognitive wireless relay network is investigated. To exploit the maximum spectrum opportunity, a cognitive space-time-frequency coding technique is presented that can opportunistically adjust its coding structure by adapting itself to the dynamic spectrum environment.

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