Energy-efficient transmission design in cooperative relaying systems using NOMA

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Journal Article
IEEE Communications Letters, 2018, 22 (3), pp. 594 - 597
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© 1997-2012 IEEE. In this letter, we investigate the optimal power allocation scheme in a cooperative relaying system using non-orthogonal multiple access from the perspective of global energy efficiency (GEE), where a source node communicates with two destination nodes simultaneously via a decode-and-forward relay. We optimize the transmit power at the source node and relay node jointly under quality of service requirements. It is proved that the optimal GEE is strictly quasi-concave with regard to the transmit power at the source node. Based on this quasi-concavity, we decompose the original nonconvex problem into a bilayer optimization problem and obtain the optimal power allocation solution. Simulation results show the effectiveness of our theoretical findings.
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