Enabling NOMA in Backscatter Reconfigurable Intelligent Surfaces-Aided Systems

Le, Chi‐Bao; Do, Dinh‐Thuan; Li, Xingwang; Huang, Yung-Fa; Chen, Hsing‐Chung; Vozňák, Miroslav

doi:10.1109/access.2021.3061429

Cited by 40 publications

(25 citation statements)

References 31 publications

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“…Energy efficiency and optimization [55], [57], [59] Authors have focused on energy optimization and minimization of transmit power and proposed an iterative non-complex algorithm and machine learning approach, which was able to boost up the performance of suggested system by 23 percent. Backscatter communication [54], [58] Authors have designed a multi-user system with direct link and backscatter link to evaluate the performance of the system and proposed a low complexity algorithm to deal with nonconvex problems like phase optimization and power reflection coefficients. Reliability [56] Authors have designed a RIS-Aided NOMA system to check the reliability in terms of BER.…”

Section: Methodsmentioning

confidence: 99%

“…It is also found that the number of RIS elements, transmit power at the BS and power allocation factors play a major role in improving the performance of the system. The destination users have more chances to receive better signals from the BS [54], [55] which is different from a RIS-NOMA system reported in [53]. They designed a RIS-NOMA system with two links i.e.…”

Section: ) State-of-the-artmentioning

confidence: 97%

“…The authors in [58]- [63] also evaluated the performance improvement of various system models of NOMA-RIS systems. For example, the interesting work in [58] designed a backscatter communication RIS system similar to [54] which investigated the joint power reflection coefficients and phase shift optimization. To solve these non-convex problems, the authors proposed a low complexity algorithm which, in the presence of a large number of meta-surfaces, outperforms the traditional NOMA Backscatter Communication (NOMABC) and OMA Backscatter Communication (OMABC) networks without RIS.…”

Section: ) State-of-the-artmentioning

confidence: 99%

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Reconfigurable Intelligent Surface Aided Multi-User Communications: State-of-the-Art Techniques and Open Issues

Munochiveyi

Pogaku

Do³

et al. 2021

IEEE Access

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Reconfigurable intelligent surface (RIS)-aided communication is considered as an exciting research topic in academic and industrial communities since it provides an emerging affordable solution to achieve high quality and secure next-generation wireless systems. Especially, the deployment of RIS in multi-user wireless networks promises to reduce system hardware costs, signal processing complexity, as well as energy consumption due to small size, lightweight and ability to actively shape the wireless propagation environment. Further, by realizing a cost-effective radio environment, RIS-aided communication can be implemented to be an appealing technology for future integration with other emerging wireless applications and communication systems. Despite the positive appeal, RISs face new challenges that hinder integrating efficiently into wireless networks, such as network secrecy performance and system sum-rates, as well as achieving efficient deployment design in highly dynamic and time-varying wireless environments. To this end, we overview recent state-of-the-art techniques to address the above issues faced in the integration of RISs with various emerging multi-user communication techniques, such as Unmanned Aerial Vehicles (UAVs), Non-Orthogonal Multiple Access (NOMA), Millimeter Wave (mmWave) and Terahertz (THz) communications, Physical Layer Security (PLS), massive antennas, and Simultaneous Wireless Information and Power Transfer (SWIPT). Finally, we highlight promising future research directions of RIS-aided communication in Cell-Free Massive Multiple-Input-Multiple-Output (MIMO) systems, Rate-Splitting Multiple Access (RSMA), Light Fidelity (LiFi), and Cognitive Radio (CR) systems.

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Section: Methodsmentioning

confidence: 99%

Section: ) State-of-the-artmentioning

confidence: 97%

Section: ) State-of-the-artmentioning

confidence: 99%

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Reconfigurable Intelligent Surface Aided Multi-User Communications: State-of-the-Art Techniques and Open Issues

Munochiveyi

Pogaku

Do³

et al. 2021

IEEE Access

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“…In this work, they examined the utilization of powerdomain NOMA at base stations with multiple antennas. Various works on multiple antennas aided NOMA have focused on perfect SIC such as [16]- [26] whereas only a few have focused on imperfect SIC (ipSIC) as in [27]- [29]. While the perfect SIC (pSIC) represents the ideal condition of no data loss and no external sounds, the ipSIC represents data transfer in a real-time context.…”

Section: Bulletin Of Electr Eng and Infmentioning

confidence: 99%

Considering the κ − µ fading channels adopted in multiple antennas downlink non-orthogonal multiple access

Nguyen

et al. 2022

Bulletin EEI

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Massive connectivity and effective spectrum usage have become more important as the use of wireless communication devices and networks has grown dramatically. The approach of non-orthogonal multiple access (NOMA) is advocated as a viable solution for meeting consumers’ current needs. The signals are overlaid with various power levels for each user in a NOMA-assisted system, and then broadcast to the receiver. SIC (successive interference cancellation) is used by the receiver to discriminate and get the needed signal. Until far, most studies have concentrated on SIC with ideal features, with only a handful focusing on SIC with imperfect qualities (ipSIC). While the perfect SIC (pSIC) represents the ideal condition of no data loss and no external sounds, the ipSIC represents data transfer in a real-time context. In this research, we will assess the system performance metrics of the investigated NOMA system in the presence of ipSIC and compare them to the performance of the same user’s pSIC. We define channels as κ−µ fading distributions, which is more essential. For two destinations, we construct accurate outage probability formulas. Meanwhile, Monte-Carlo simulations are run to ensure that the mathematical expressions derived are genuine.

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“…However, the design of beamforming matrix is required with complicated architecture and high cost to focus the signal transmission to a desired spatial cluster for NOMA signal processing. Fortunately, requirement of IoT design still prefer low cost solution with single antenna at the source (access point or base station) 3. In the context of cognitive AmBC NOMA, to avoid additional co-channel interference from multiple RF sources and/or BD, the distances between the BD and the corresponding NOMA users are assumed to be relatively short.…”

mentioning

confidence: 99%

Joint Design of Improved Spectrum and Energy Efficiency With Backscatter NOMA for IoT

Silva

et al. 2022

IEEE Access

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To develop emerging transmission techniques for potential applications of Internet of Things (IoT), the system performance analysis of a cognitive radio (CR)-enabled ambient backscatter (AmBC) system will be studied in this paper with functionality of non-orthogonal multiple access (NOMA). In the proposed scheme, a base station communicates with two destinations via a designated backscatter device. It is assumed that the relay node is fitted with two different interfaces and can simultaneously collect/decode and backscatter the received source signals. Such transmission mechanism benefits to design various applications in IoT as well as wireless systems with improved performance. To exhibit system performance metrics, the outage probability and the ergodic capacity of the recipient nodes are derived analytically. Furthermore, it is shown that employing AmBC NOMA together with CR for secondary communication can significantly improve overall network performance in terms of the achievable throughput in delaylimited and delay-tolerant modes and outage probability. Numerical results show that: 1) The proposed system can improve the spectrum efficiency by employing both CR and NOMA techniques; 2) Compared with the orthogonal multiple access (OMA)-aided AmBC systems, the considered CR AmBC system relying on NOMA can obtain better reliability in the whole range of SNR; 3) There are error floors for the outage probability in the high SNR regime due to required target rates; 4) There exists a trade-off between system performance of IoT devices and power allocation coefficients associated with NOMA; 5) We find energy efficiency factor as evident of further improvement in such system.

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Enabling NOMA in Backscatter Reconfigurable Intelligent Surfaces-Aided Systems

Cited by 40 publications

References 31 publications

Reconfigurable Intelligent Surface Aided Multi-User Communications: State-of-the-Art Techniques and Open Issues

Reconfigurable Intelligent Surface Aided Multi-User Communications: State-of-the-Art Techniques and Open Issues

Considering the κ − µ fading channels adopted in multiple antennas downlink non-orthogonal multiple access

Joint Design of Improved Spectrum and Energy Efficiency With Backscatter NOMA for IoT

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