Modeling and Analysis of Reconfigurable Intelligent Surfaces for Indoor and Outdoor Applications in Future Wireless Networks

Yildirim, Ibrahim; Uyrus, Ali; Başar, Ertuğrul

doi:10.1109/tcomm.2020.3035391

Cited by 229 publications

(164 citation statements)

References 26 publications

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“…RIS is a programmable metasurface with low power consumption, and it can provide passive beamforming gains. Recently, attractive benefits of RIS have been validated in various scenarios [3]- [7]. To be more specific, the authors in [3] showed that RIS has sufficient potential in future communications by jointly designing its passive beamforming and base stations (BSs)' active beamforming vectors.…”

Section: Introductionmentioning

confidence: 99%

Statistical CSI-Based Design for Reconfigurable Intelligent Surface-Aided Massive MIMO Systems With Direct Links

Zhi

Pan

Ren

et al. 2021

IEEE Wireless Commun. Lett.

110

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This paper investigates the performance of reconfigurable intelligent surface (RIS)-aided massive multiple-input multiple-output (mMIMO) systems with direct links, and the phase shifts of the RIS are designed based on the statistical channel state information (CSI). We first derive the closed-form expression of the uplink ergodic data rate. Then, based on the derived expression, we use the genetic algorithm (GA) to solve the sum data rate maximization problem. With low-complexity maximal-ratio combination (MRC) and low-overhead statistical CSI-based scheme, we validate that the RIS can bring significant performance gains to the traditional mMIMO systems.

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Section: Introductionmentioning

confidence: 99%

Statistical CSI-Based Design for Reconfigurable Intelligent Surface-Aided Massive MIMO Systems With Direct Links

Zhi

Pan

Ren

et al. 2021

IEEE Wireless Commun. Lett.

110

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“…(vi) design of NOMA-based systems for downlink transmit power minimization and for the minimum decoding SINR maximization of all users (Ding and Poor, 2019;Fu et al, 2019), (vii) channel modeling and measurements for different frequency bands and RIS types (Tang, 2019;Basar and Yildirim, 2020a,b,c;Danufane et al, 2020;Yildirim et al, 2020), and (viii) practical implementations (Dai et al, 2020(Dai et al, , 2021.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Intelligent Surfaces for Doppler Effect and Multipath Fading Mitigation

Başar

2021

Front. Comms. Net.

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Owing to the envisioned new use-cases, such as immersive virtual reality and high-fidelity mobile hologram, and their potential challenging new requirements for future wireless networks, extensive research has already started on 6G and beyond wireless technologies. Despite the fact that several modern physical layer solutions have been introduced in the past decade, a level of saturation has been reached in terms of the available spectrum and adapted modulation/coding solutions, which accordingly limits the maximum capacity and reliability. Within this respective, reconfigurable intelligent surface (RIS)-empowered communication appears as a potential candidate to overcome the inherent drawbacks of legacy wireless systems. The core idea of RIS-assisted communication is the transformation of the random and uncontrollable wireless propagation environment into a reconfigurable communication system entity that plays an active role in conveying information and improving system performance. In this paper, the well-known multipath fading phenomenon is revisited in mobile wireless communication systems, and novel and unique solutions are introduced from the perspective of RISs. The feasibility of eliminating or mitigating the multipath fading effect stemming from the movement of mobile receivers is also investigated by utilizing RISs. It is shown that rapid fluctuations in the received signal strength due to the Doppler effect can be effectively reduced by using real-time tunable RISs. It is also proven that for a hypothetical propagation environment where all reflectors are coated with RISs, the multipath fading effect can be totally eliminated. Furthermore, we show that for more general propagation environments with several interacting objects, even a few real-time tunable RISs can remarkably reduce the Doppler spread and the deep fades in the received signal.

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“…Typically, RSS-assisted communications under the scattering paradigm is presented as an alternative path to the degraded direct link due to strong blockages [23]. Accordingly, the effect of the direct link is ignored and the effective received signal is only the one scattered by the RSS.…”

Section: B the Scattering Reflection Paradigmmentioning

confidence: 99%

Link Budget Analysis for Reconfigurable Smart Surfaces in Aerial Platforms

Alfattani¹,

Jaafar²,

Hmamouche³

et al. 2021

Preprint

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<div>Non-terrestrial networks, including Unmanned Aerial Vehicles (UAVs), High Altitude Platform Station (HAPS) and Low Earth Orbiting (LEO) satellites, are expected to have a pivotal role in the sixth generation wireless networks. With their inherent features such as flexible placement, wide footprint, and preferred channel conditions, they can tackle several challenges in current terrestrial networks. However, their successful and widespread adoption relies on energy-efficient on-board communication systems. In this context, the integration of Reconfigurable Smart Surfaces (RSS) into aerial platforms is envisioned as a key enabler of energy-efficient and cost-effective deployments of aerial platforms. Indeed, RSS consist of low-cost reflectors capable of smartly directing signals in a nearly passive way. We investigate in this paper the link budget of RSS-assisted communications under the two discussed RSS reflection paradigms in the literature, namely the specular and the scattering reflection paradigm types. Specifically, we analyze the characteristics of RSS-equipped aerial platforms and compare their communication performance with that of RSS-assisted terrestrial networks, using standardized channel models. In addition, we derive the optimal aerial platforms placements under both reflection paradigms. The obtained results provide important insights for the design of RSS-assisted communications. For instance, given that a HAPS has a large RSS surface, it provides superior link budget performance in most studied scenarios. In contrast, the limited RSS area on UAVs and the large propagation loss in LEO satellite communications make them unfavorable candidates for supporting terrestrial users. Finally, the optimal location of the RSS-equipped platform may depend on the platform’s altitude, coverage footprint, and type of environment.</div>

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Modeling and Analysis of Reconfigurable Intelligent Surfaces for Indoor and Outdoor Applications in Future Wireless Networks

Cited by 229 publications

References 26 publications

Statistical CSI-Based Design for Reconfigurable Intelligent Surface-Aided Massive MIMO Systems With Direct Links

Statistical CSI-Based Design for Reconfigurable Intelligent Surface-Aided Massive MIMO Systems With Direct Links

Reconfigurable Intelligent Surfaces for Doppler Effect and Multipath Fading Mitigation

Link Budget Analysis for Reconfigurable Smart Surfaces in Aerial Platforms

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