Reconfigurable Intelligent Surface Enabled Full-Duplex/Half-Duplex Cooperative Non-Orthogonal Multiple Access

This paper investigates the downlink transmission of reconfigurable intelligent surface (RIS)-aided cooperative non-orthogonal-multiple-access (C-NOMA), where both half-duplex (HD) and full-duplex (FD) relaying modes are considered. The system model consists of one base station (BS), two users and o...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2022-05, Vol.21 (5), p.3349-3364
Main Authors: Elhattab, Mohamed, Arfaoui, Mohamed Amine, Assi, Chadi, Ghrayeb, Ali
Format: Article
Language:English
Subjects:
Algorithms
Array signal processing
Beamforming
C-NOMA
Cellular networks
Closed form solutions
Coefficients
Exact solutions
NOMA
Nonorthogonal multiple access
Optimization
passive beamforming
power allocation
Power control
Quality of service
Reconfigurable intelligent surfaces
Relay
Relaying
Resource management
RIS
Wireless communication
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Summary:This paper investigates the downlink transmission of reconfigurable intelligent surface (RIS)-aided cooperative non-orthogonal-multiple-access (C-NOMA), where both half-duplex (HD) and full-duplex (FD) relaying modes are considered. The system model consists of one base station (BS), two users and one RIS. The goal is to minimize the total transmit power at both the BS and at the user-cooperating relay for each relaying mode by jointly optimizing the power allocation coefficients at the BS, the transmit power coefficient at the relay user, and the passive beamforming at the RIS, subject to power budget constraints, the successive interference cancellation constraint and the minimum required quality-of-service at both cellular users. To address the high-coupled optimization variables, an efficient algorithm is proposed by invoking an alternating optimization approach that decomposes the original problem into a power allocation sub-problem and a passive beamforming sub-problem, which are solved alternately. For the power allocation sub-problem, the optimal closed-form expressions for the power allocation coefficients are derived. Meanwhile, with the aid of difference-of-convex rank-one representation and successive convex approximation, an efficient solution for the passive beamforming is obtained. The simulation results validate the accuracy of the derived power control closed-form expressions and demonstrate the gain in the total transmit power brought by integrating the RIS in C-NOMA networks.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2021.3120989