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Sensors 2017, 17(11), 2465; https://doi.org/10.3390/s17112465

Power Allocation Scheme for Non-Orthogonal Multiple Access in Underwater Acoustic Communications

School of Electronics Engineering, Kyungpook National University, Daegu 41566, Korea
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Received: 11 September 2017 / Revised: 20 October 2017 / Accepted: 23 October 2017 / Published: 27 October 2017
(This article belongs to the Special Issue Advances and Challenges in Underwater Sensor Networks)
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Abstract

In this paper, we propose a power allocation scheme for non-orthogonal multiple access (NOMA) in underwater acoustic sensor networks (UWASNs). The existing terrestrial sum-rate maximization (SRM) power allocation scheme suffers from the degradation of the overall sum-rate in UWASNs due to wasteful resource created by unequal transmission times between each transmission path. To address this issue, we propose the equal transmission times (ETT) power allocation scheme, which can prevent wasteful resource generation by guaranteeing equal transmission times between each transmission path. ETT considers the number of packets waiting for transmission in the sender’s buffer for creating equal transmission times. Numerical results show that the proposed ETT outperforms SRM in terms of the overall sum-rate, while having nearly identical maximum sum-rate to the SRMs. View Full-Text
Keywords: power allocation; non-orthogonal multiple access (NOMA); underwater acoustic sensor networks (UWASNs) power allocation; non-orthogonal multiple access (NOMA); underwater acoustic sensor networks (UWASNs)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cheon, J.; Cho, H.-S. Power Allocation Scheme for Non-Orthogonal Multiple Access in Underwater Acoustic Communications. Sensors 2017, 17, 2465.

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