Optimal RIS partitioning and power control for bidirectional NOMA networks
Optimal RIS partitioning and power control for bidirectional NOMA networks
This study delves into the capabilities of reconfigurable intelligent surfaces (RISs) in enhancing bidirectional non-orthogonal multiple access (NOMA) networks. The proposed approach partitions RIS to optimize the channel conditions for NOMA users, improving NOMA gain and eliminating the requirement for uplink (UL) power control. The proposed approach is rigorously evaluated under four practical operational regimes; 1) Quality-of-Service (QoS) sufficient regime, 2) RIS and power efficient regime, 3) max-min fair regime, and 4) maximum throughput regime, each subject to both UL and downlink (DL) QoS constraints. By leveraging decoupled nature of RIS portions and base station (BS) transmit power, closed-form solutions are derived to show how optimal RIS partitioning can meet UL-QoS requirements while optimal BS power control can ensure DL-QoS compliance. Analytical findings are validated by simulations, highlighting the significant benefits that RISs can bring to the NOMA networks in the aforementioned operational scenarios.
Grant-free non-orthogonal multiple access (NOMA), large intelligent surface (LIS), max-sum rate (MSR), optimization, passive beamforming, reconfigurable intelligent surface (RIS)
3175-3189
Makin, Madi
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Arzykulov, Sultangali
25fb1b83-665d-4fe7-9e56-81cacc2f8e7a
Celik, Abdulkadir
f8e72266-763c-4849-b38e-2ea2f50a69d0
Eltawil, Ahmed M.
5eb9e965-5ec8-4da1-baee-c3cab0fb2a72
Nauryzbayev, Galymzhan
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1 April 2024
Makin, Madi
bf8c6a8f-ab2e-4d5f-8435-5899351be242
Arzykulov, Sultangali
25fb1b83-665d-4fe7-9e56-81cacc2f8e7a
Celik, Abdulkadir
f8e72266-763c-4849-b38e-2ea2f50a69d0
Eltawil, Ahmed M.
5eb9e965-5ec8-4da1-baee-c3cab0fb2a72
Nauryzbayev, Galymzhan
3fbbb5ed-dc25-4c5a-943c-7fd329867c75
Makin, Madi, Arzykulov, Sultangali, Celik, Abdulkadir, Eltawil, Ahmed M. and Nauryzbayev, Galymzhan
(2024)
Optimal RIS partitioning and power control for bidirectional NOMA networks.
IEEE Transactions on Wireless Communications, 23 (4), .
(doi:10.1109/TWC.2023.3306048).
Abstract
This study delves into the capabilities of reconfigurable intelligent surfaces (RISs) in enhancing bidirectional non-orthogonal multiple access (NOMA) networks. The proposed approach partitions RIS to optimize the channel conditions for NOMA users, improving NOMA gain and eliminating the requirement for uplink (UL) power control. The proposed approach is rigorously evaluated under four practical operational regimes; 1) Quality-of-Service (QoS) sufficient regime, 2) RIS and power efficient regime, 3) max-min fair regime, and 4) maximum throughput regime, each subject to both UL and downlink (DL) QoS constraints. By leveraging decoupled nature of RIS portions and base station (BS) transmit power, closed-form solutions are derived to show how optimal RIS partitioning can meet UL-QoS requirements while optimal BS power control can ensure DL-QoS compliance. Analytical findings are validated by simulations, highlighting the significant benefits that RISs can bring to the NOMA networks in the aforementioned operational scenarios.
Text
Optimal_RIS_Partitioning_and_Power_Control_for_Bidirectional_NOMA_Networks
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More information
Accepted/In Press date: 8 August 2023
e-pub ahead of print date: 23 August 2023
Published date: 1 April 2024
Keywords:
Grant-free non-orthogonal multiple access (NOMA), large intelligent surface (LIS), max-sum rate (MSR), optimization, passive beamforming, reconfigurable intelligent surface (RIS)
Identifiers
Local EPrints ID: 505753
URI: http://eprints.soton.ac.uk/id/eprint/505753
ISSN: 1536-1276
PURE UUID: 96f94a7c-14d0-494d-bb0d-bc345c12e1c8
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Date deposited: 17 Oct 2025 16:40
Last modified: 18 Oct 2025 02:18
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Contributors
Author:
Madi Makin
Author:
Sultangali Arzykulov
Author:
Abdulkadir Celik
Author:
Ahmed M. Eltawil
Author:
Galymzhan Nauryzbayev
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