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In this paper, the authors investigate and evaluate the performance of incremental relaying and relay selection, when used in the context of cognitive radio networks. Assuming that a number of cognitive radio relay nodes N (N-2) are co-located with simultaneous primary and secondary transmissions, the "Best" relays are chosen to assist the primary and/or the secondary transmissions (in case of decoding failure at the destinations using the direct link source-destination). The outage probability of both primary and secondary systems is investigated and the associated power allocation problem analyzed.
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