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Cooperative Communication (CC) has been proposed to achieve spatial diversity without requiring multiple antennas on a single device. Many efforts in exploiting the benefits of CC focus on improving the performance in terms of outage probability and channel capacity. However, the energy efficiency of CC, which is critical for the applications with energy constraints, has been little studied. In this paper, the authors study the problem of energy-efficient CC in Cognitive Radio networks by taking power control, relay assignment and channel allocation into consideration. They obtain the optimal power control for a single source-destination pair. After that, a heuristic algorithm is proposed to solve the relay assignment and channel allocation problem for multiple source-destination pairs.
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