We propose a distributed spectrum access algorithm for cognitive radio relay networks with multiple primary users (PU) and multiple secondary users (SU) utilizing multiple antennas at their transmitter. The overlay model is considered, where the PUs allow spectrum access opportunities for the SUs, in exchange for the SUs cooperatively relaying the PUs' data in exchange for both spectrum access and monetary compensation. We show that the PUs which utilize the SUs for cooperative relaying achieves a rate greater than what it would achieve without cooperative relaying, i.e., direct transmission, and thus motivates their participation in the proposed algorithm.
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