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Cognitive radios are a natural evolution of Software Defined Radios (SDRs) that are supposed to be equipped with the ability to learn their RF environment and reconfigurability. A cognitive radio can communicate over a primary user's channel as long as the introduced interference does not degrade the primary Single-to-Interference-plus-Noise-Ratio (SINR) below its minimum Quality of Service (QoS) requirement. Previously, node cooperation has been applied to cognitive radios to achieve improved spectrum sensing performance. In this paper, on the other hand, the authors employ cooperation in data transmission in order to increase the secondary transmit power limit.
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