TY - JOUR
T1 - Optimal RIS Partitioning and Power Control for Bidirectional NOMA Networks
AU - Makin, Madi
AU - Arzykulov, Sultangali
AU - Celik, Abdulkadir
AU - Eltawil, Ahmed
AU - Nauryzbayev, Galymzhan
N1 - KAUST Repository Item: Exported on 2023-09-07
Acknowledgements: This research was partially funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (Grant No. AP13068122) and Nazarbayev University under Collaborative Research Program Grant no. 11022021CRP1513 (PI: Galymzhan Nauryzbayev).
PY - 2023/8/23
Y1 - 2023/8/23
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/690692
UR - https://ieeexplore.ieee.org/document/10227895/
UR - http://www.scopus.com/inward/record.url?scp=85168703156&partnerID=8YFLogxK
U2 - 10.1109/twc.2023.3306048
DO - 10.1109/twc.2023.3306048
M3 - Article
SN - 1536-1276
SP - 1
EP - 1
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
ER -