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In this paper, the authors investigate the performance gains of cognitive radio relay networks under delay Quality of Service (QoS) limitations at the secondary users, and spectrum-sharing restrictions imposed by the primary users of the channel. In particular, they assume that the primary user allows secondary users to gain access to its allocated spectrum band as long as a certain threshold on its corresponding outage probability is satisfied. Using this constraint, they find the maximum limit on the interference-power inflicted on the primary receiver that should not be exceeded by the transmission of the secondary users.
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