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Article

Optimal Power Allocation with Sectored Cells for Sum-Throughput Maximization in Wireless-Powered Communication Networks Based on Hybrid SDMA/NOMA

Department of Computer Science, Hanyang University, Seoul 04763, Korea
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Author to whom correspondence should be addressed.
Academic Editors: Hirokazu Kobayashi, Pingyi Fan and Andrea Randazzo
Electronics 2022, 11(6), 844; https://doi.org/10.3390/electronics11060844
Received: 3 January 2022 / Revised: 4 March 2022 / Accepted: 6 March 2022 / Published: 8 March 2022
Wireless-powered communication networks (WPCNs) consist of wireless devices (WDs) that transmit information to the hybrid access point (HAP). In this situation, there is interference among WDs that is considered to be noise and causes information loss because of adjacent signals. Moreover, power is limited and can be lost if transmission distance is long. This paper studies sum-throughput maximization with sectored cells for WPCN. We designed a downlink (DL) energy beamforming by sector based on the hybrid space division multiple access (SDMA) and nonorthogonal multiple access (NOMA) approach to maximize the sum throughput. First, a cell is divided into several sectors, and signals from each sector are transmitted to each antenna of the HAP, so that the signals are not adjacent. Further, the HAP decodes the overlapping information of each sector. Next, power allocation is optimized by sector. To optimize power allocation, a constrained optimization problem is formulated and then converted into a nonconstraint optimization problem using the interior penalty method. The optimal solution derives the maximal value to the problem. Power for each sector is optimally allocated according to this optimal solution. Under this consideration, sum-throughput maximization is performed by optimally allocating DL energy beamforming by sector. We analyzed sum throughput and fairness, and then compared them according to the number of sectors. Performance results show that the proposed optimal power allocation by sector using hybrid SDMA/NOMA outperforms the existing equal power allocation by sector in terms of the sum throughput while fairness is also maintained. Moreover, the performance difference between the hybrid approach and SDMA, which optimally allocates power by sector, was about 1.4 times that of sum throughput on average, and the hybrid approach was dominant. There was also no difference in fairness performance. View Full-Text
Keywords: WPCN; sector; power; optimization; hybrid SDMA/NOMA; beamforming WPCN; sector; power; optimization; hybrid SDMA/NOMA; beamforming
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MDPI and ACS Style

Maeng, J.; Dahouda, M.K.; Joe, I. Optimal Power Allocation with Sectored Cells for Sum-Throughput Maximization in Wireless-Powered Communication Networks Based on Hybrid SDMA/NOMA. Electronics 2022, 11, 844. https://doi.org/10.3390/electronics11060844

AMA Style

Maeng J, Dahouda MK, Joe I. Optimal Power Allocation with Sectored Cells for Sum-Throughput Maximization in Wireless-Powered Communication Networks Based on Hybrid SDMA/NOMA. Electronics. 2022; 11(6):844. https://doi.org/10.3390/electronics11060844

Chicago/Turabian Style

Maeng, Juhyun, Mwamba Kasongo Dahouda, and Inwhee Joe. 2022. "Optimal Power Allocation with Sectored Cells for Sum-Throughput Maximization in Wireless-Powered Communication Networks Based on Hybrid SDMA/NOMA" Electronics 11, no. 6: 844. https://doi.org/10.3390/electronics11060844

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