SimRIS Channel Simulator for Reconfigurable Intelligent Surface-Empowered Communication Systems

Başar, Ertuğrul; Yildirim, Ibrahim

doi:10.1109/latincom50620.2020.9282349

Cited by 68 publications

(67 citation statements)

References 11 publications

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“…where G e is the element gain, θ n (t) is the adjustable phase of the nth RIS element and d R n (t) is the associated path length (Basar and Yildirim, 2020b). Here, under the case of far-field, the same path loss is assumed for all RIS elements.…”

Section: Eliminating Multipath Fading Due To User Movement With An Rismentioning

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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Section: Eliminating Multipath Fading Due To User Movement With An Rismentioning

confidence: 99%

Reconfigurable Intelligent Surfaces for Doppler Effect and Multipath Fading Mitigation

Başar

2021

Front. Comms. Net.

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“…Assuming that the Tx-RSS and RSS-Rx distances are large, i.e., higher than lim , and that tiny RSS reflector units are used, i.e., of dimensions between 0.1 and 0.2 , then, each reflector capturing the transmitted signal behaves as a new signal source that re-scatters the signal towards the UE. In this paradigm, known as the scattering reflection paradigm, the total effect on the transmitted signal is the resultant of the cascaded individual channels Tx-RSS and RSS-Rx [29]- [31].…”

Section: B the Scattering Reflection Paradigmmentioning

confidence: 99%

“…To accurately assess the SRSS-assisted terrestrial communications, we present next the link budget analysis for two channel models, namely the log-distance and 3GPP based models 4 1) Log-distance Channel Model For the ℎ reflector unit of the SRSS, the channel effect of the received signal, denoted , is resulting from two cascaded channels, i.e., Tx-ℎ reflector and ℎ reflector-Rx [29], [30]. The channel coefficient is given by…”

Section: B the Scattering Reflection Paradigmmentioning

confidence: 99%

“…Typically, when the RSS is within relatively short distances from the transmitter and receiver or the RSS units are electrically large, e.g., their dimensions are 10 times larger than the wavelength denoted , the path-loss undergoes the specular reflection paradigm [13], [24], [28]. Otherwise, i.e, when the distances between the RSS and transmitter or receiver are very large or the RSS units dimensions are very small, then the RSS-assisted communication system follows the plate scattering reflection paradigm [29], [30]. To be noted that the scattering paradigm can be designated as the far-field, whereas the specular reflection is often known as the near-field.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The large-scale free space path loss model for RIS-assisted wireless communications has been proposed in [19] whereas the small-scale fading investigation is ongoing. A parametric channel model for RIS-empowered systems has been presented in [20], but without explicit and tractable expressions for the small-scale fading.…”

Section: Introductionmentioning

confidence: 99%

Small-Scale Spatial-Temporal Correlation Modeling for Reconfigurable Intelligent Surfaces

Sun¹,

Yan²

2021

Preprint

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<div><div><div><p>The reconfigurable intelligent surface (RIS) is an emerging promising candidate technology for the sixth-generation wireless networks, where the element spacing is usually of sub-wavelength. Only limited knowledge, however, has been gained about the spatial-temporal correlation behavior among the elements in an RIS. In this paper, we investigate the spatial-temporal correlation models for an RIS in a wireless communication system. Joint small-scale spatial-temporal correlation functions are provided and analyzed for both ideal isotropic scattering and more practical non-isotropic scattering environments, where the latter is studied via employing an angular distribution derived from real-world millimeter-wave measurements. Furthermore, for the special case of spatial-only correlation under isotropic scattering, an analytical expression is proposed to characterize the spatial degrees of freedom (DoF) for RISs with finite element spacing and aperture sizes in practice. Analytical and numerical results demonstrate that the joint spatial-temporal correlation can be represented by a four-dimensional sinc function under isotropic scattering, while the correlation is generally stronger with more fluctuation and significantly fewer dominant eigenvalues hence smaller DoF for non-isotropic scattering.</p></div></div></div>

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SimRIS Channel Simulator for Reconfigurable Intelligent Surface-Empowered Communication Systems

Cited by 68 publications

References 11 publications

Reconfigurable Intelligent Surfaces for Doppler Effect and Multipath Fading Mitigation

Reconfigurable Intelligent Surfaces for Doppler Effect and Multipath Fading Mitigation

Link Budget Analysis for Reconfigurable Smart Surfaces in Aerial Platforms

Small-Scale Spatial-Temporal Correlation Modeling for Reconfigurable Intelligent Surfaces

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