RIS-Assisted Cooperative NOMA With SWIPT

Ren, Jiayu; Lei, Xianfu; Peng, Zhangjie; Tang, Xiaohu; Dobre, Octavia A.

doi:10.1109/lwc.2022.3229843

Cited by 28 publications

(7 citation statements)

References 15 publications

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“…, where the distance between BS1 and T and 2 T , respectively. Theorem 1 in reference [30] states the following:…”

Section: User Grouping Based On Distributed Rissmentioning

confidence: 99%

Cluster-Based Strategy for Maximizing the Sum-Rate of a Distributed Reconfigurable Intelligent Surface (RIS)-Assisted Coordinated Multi-Point Non-Orthogonal Multiple-Access (CoMP-NOMA) System

Yang,

Zhang,

Peng

2024

Sensors

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This article proposes a distributed intelligent Coordinated Multi-Point Non-Orthogonal Multiple-Access (CoMP-NOMA) collaborative transmission model with the assistance of reconfigurable intelligent surfaces (RISs) to address the issues of poor communication quality, low fairness, and high system power consumption for edge users in multi-cellular networks. By analyzing the interaction mechanisms and influencing factors among RIS signal enhancement, NOMA user scheduling, and multi-point collaborative transmission, the model establishes RIS-enhanced edge user grouping and coordinates NOMA user clusters based on this. In the multi-cell RIS-assisted JT-CoMP NOMA downlink transmission, joint optimization of the power allocation (PA), user clustering (UC), and RIS phase-shift matrix design (PS) poses a challenging Mixed-Integer Non-Linear Programming (MINLP) problem. The original problem is decomposed by optimizing the formulas into joint sub-problems of PA, UC, and PA and PS, and solved using an alternating optimization approach. Simulation results demonstrate that the proposed scheme effectively reduces the system’s power consumption while significantly improving the system’s throughput and rates.

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“…, where the distance between BS1 and T and 2 T , respectively. Theorem 1 in reference [30] states the following:…”

Section: User Grouping Based On Distributed Rissmentioning

confidence: 99%

Cluster-Based Strategy for Maximizing the Sum-Rate of a Distributed Reconfigurable Intelligent Surface (RIS)-Assisted Coordinated Multi-Point Non-Orthogonal Multiple-Access (CoMP-NOMA) System

Yang,

Zhang,

Peng

2024

Sensors

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“…Differently, in [28], the authors proposed an algorithm to jointly optimize the beamforming and the PS coefficient. In [30] the authors proposed a based-twostage transmission scheme where the joint optimization of PS factors, beamforming coefficients, and RIS reflection coefficients have been considered, aiming to maximize the achievable rate of the strong user with guaranteed weak user's QoS. In [31] the authors proposed an algorithm to maximize the sum rate by optimizing the time allocation factor and phase shift matrix of a RIS-assisted Internet of Things (IoT)-NOMA system.…”

Section: A Motivation Novelty and Contributionsmentioning

confidence: 99%

RIS-aided Cooperative FD-SWIPT-NOMA Performance over Nakagami-m Channels

Junior,

Abrao

2023

Preprint

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In this work, we investigate reconfigurable intelligent surface (RIS)-assisted Cooperative non-Orthogonal Multiple Access (C-NOMA) consisting of two paired devices. The device with better channel conditions (D1) is designated to act as a full-duplex (FD) relay to assist the device with poor channel conditions (D2). D1 does not use its battery energy to cooperate but harvests energy using Simultaneous Wireless Information Power Transfer (SWIPT). A practical non-linear Energy Harvesting (EH) model is consid- ered. We assume that all devices’ links undergo Nakagami-m channel fading. We first approximate the harvested power as Gamma random variables via the Moment Matching (MM) technique. This allows us to derive analytical expressions for Outage Probability (OP) and ergodic rate (ER) that are simple to compute yet accurate for a wide range of RIS passive elements configurations, EH coefficients, and residual Self Interference (SI) levels, being extensively validated by numerical simulations. The OP expressions reveal how important it is to mitigate the SI in the FD relay mode since, for reasonable values of residual SI coefficient, it is notable its detrimental effect on the system performance. Also, numerical results reveal that increasing the number of RIS elements can benefit the cooperative system much more than the non-cooperative one.

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“…RISs are not only capable of building virtual LoS links when LoS links are blocked [19], but can also bring outstanding performance gains in SWIPT [20]. Hence, tremendous research efforts have been devoted to RIS-aided SWIPT-NOMA systems [21]- [23]. A RISassisted cooperative SWIPT-NOMA system was investigated in [21], [22], where [21] focused on improving the achievable rate of the strong user with guaranteeing the weak user's quality of service and [22] is devoted to maximizing the data rate of the cell-edge user.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, tremendous research efforts have been devoted to RIS-aided SWIPT-NOMA systems [21]- [23]. A RISassisted cooperative SWIPT-NOMA system was investigated in [21], [22], where [21] focused on improving the achievable rate of the strong user with guaranteeing the weak user's quality of service and [22] is devoted to maximizing the data rate of the cell-edge user. A RIS-aided MISO SWIPT-NOMA system was proposed in [23], which considered a cooperative transmission scheme to improve the performance of cell-edge users.…”

Section: Introductionmentioning

confidence: 99%

“…A RIS-aided MISO SWIPT-NOMA system was proposed in [23], which considered a cooperative transmission scheme to improve the performance of cell-edge users. However, in [21]- [23], the HU architecture was utilized to harvest energy, where energy harvesting nodes do not buffer the energy for use in future time slots. Moreover, the conventional RIS only reflects the wireless signal to the users, which makes it necessary for the transmitter and receiver to be on the same side.…”

Section: Introductionmentioning

confidence: 99%

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Design and Performance Analysis of RIS-Aided DCSK-WPC System With Energy Buffer

Xie

Cai

Kaddoum³

2023

IEEE Trans. Commun.

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In this paper, we propose a simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) and energy buffer aided multiple-input single-output (MISO) simultaneous wireless information and power transfer (SWIPT) nonorthogonal multiple access (NOMA) system, which consists of a STAR-RIS, an access point (AP), and reflection users and transmission users with energy buffers. In the proposed system, the multi-antenna AP can transmit information and energy to several single-antenna reflection and transmission users simultaneously in a NOMA fashion, where the power transfer and information transmission states of the users are modeled using Markov chains. The reflection and transmission users harvest and store the energy in energy buffers as additional power supplies. The power outage probability, information outage probability, sum throughput, and joint outage probability closed-form expressions of the proposed system are derived over Nakagami-m fading channels, which are validated via simulations. Results demonstrate that the proposed system achieves better performance in comparison to the STAR-RIS aided MISO SWIPT-NOMA buffer-less, conventional RIS and energy buffer aided MISO SWIPT-NOMA, and STAR-RIS and energy buffer aided MISO SWIPT-time-division multiple access (TDMA) systems. Furthermore, a particle swarm optimization based power allocation (PSO-PA) algorithm is designed to maximize the sum throughput with a constraint on the joint outage probability. Simulation results illustrate that the proposed PSO-PA algorithm can achieve an improved sum throughput performance of the proposed system. Index Terms-Simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS), energy buffer, simultaneous wireless information and power transfer (SWIPT), non-orthogonal multiple access (NOMA), Markov chains.

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RIS-Assisted Cooperative NOMA With SWIPT

Cited by 28 publications

References 15 publications

Cluster-Based Strategy for Maximizing the Sum-Rate of a Distributed Reconfigurable Intelligent Surface (RIS)-Assisted Coordinated Multi-Point Non-Orthogonal Multiple-Access (CoMP-NOMA) System

Cluster-Based Strategy for Maximizing the Sum-Rate of a Distributed Reconfigurable Intelligent Surface (RIS)-Assisted Coordinated Multi-Point Non-Orthogonal Multiple-Access (CoMP-NOMA) System

RIS-aided Cooperative FD-SWIPT-NOMA Performance over Nakagami-m Channels

Design and Performance Analysis of RIS-Aided DCSK-WPC System With Energy Buffer

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