LiFi Through Reconfigurable Intelligent Surfaces: A New Frontier for 6G?

The Fisher–Snedecor (F-S) F distribution has recently been introduced as a tractable turbulence-induced (TI) fading model that fits well with the experimental data. This paper provides a performance evaluation of a free-space optical (FSO) re-configurable intelligent surface (RIS)-assisted communications (ACs) link over the F-S F TI fading channels, assuming the intensity modulation–direct detection (IM–DD) technique. In particular, novel and closed-form (C-F) analytical expressions for the probability density function (PDF) and cumulative distribution function (CDF) of the end-to-end signal-to-noise ratio (SNR) in terms of Gaussian hyper-geometric functions are efficiently derived. Capitalizing on the obtained results, novel C-F analytical expressions for the moment generating function (MMGF), outage probability (OP), average bit error rate (BER) and ergodic channel capacity (Cγ) of the FSO RIS-ACs system over the F-S F TI fading channels are provided and numerically evaluated under the various TI fading severity conditions. Furthermore, the second-order (S-O) statistical expressions for the level crossing rate (LCR) and average fade duration (AFD) are obtained and thoroughly examined for various FSO RIS-ACs system model parameters.

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“…where β(•, •) is the Beta function ( [39], Equation (8.380.1)). It can be concluded that p γ F S (γ F S ) in (7) for…”

Section: Fisher-snedecor F Composite Fading Modelmentioning

confidence: 99%

“…Moreover, a comparison between relay-ACs and RIS-ACs is provided in [5]. In [6], mmWave RIS-ACs systems are considered, whereas visible light communication (VLC) RIS-ACs systems are considered in [7,8].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of RIS-Assisted FSO Communications over Fisher–Snedecor F Turbulence Channels

2021

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“…Although different works propose the integration on RIS in different fields (e.g., Unmanned Aerial Vehicles (UAV) [12]), there is a lack of study on the security properties of this new technology. The integration of RIS with attributes was studied in [30], which particularly focus on the LiFi application of VLC. Here the authors discussed how RIS can improve different PLS properties such as Secrecy capacity, jamming protection, and secure beamforming.…”

Section: Related Workmentioning

confidence: 99%

VLC Physical Layer Security through RIS-aided Jamming Receiver for 6G Wireless Networks

Soderi¹,

Brighente²,

Turrin³

et al. 2022

Preprint

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Visible Light Communication (VLC) is one the most promising enabling technology for future 6G networks to overcome Radio-Frequency (RF)-based communication limitations thanks to a broader bandwidth, higher data rate, and greater efficiency. However, from the security perspective, VLCs suffer from all known wireless communication security threats (e.g., eavesdropping and integrity attacks). For this reason, security researchers are proposing innovative Physical Layer Security (PLS) solutions to protect such communication. Among the different solutions, the novel Reflective Intelligent Surface (RIS) technology coupled with VLCs has been successfully demonstrated in recent work to improve the VLC communication capacity. However, to date, the literature still lacks analysis and solutions to show the PLS capability of RIS-based VLC communication.In this paper, we combine watermarking and jamming primitives through the Watermark Blind Physical Layer Security (WBPLSec) algorithm to secure VLC communication at the physical layer. Our solution leverages RIS technology to improve the security properties of the communication. By using an optimization framework, we can calculate RIS phases to maximize the WBPLSec jamming interference schema over a predefined area in the room. In particular, compared to a scenario without RIS, our solution improves the performance in terms of secrecy capacity without any assumption about the adversary's location. We validate through numerical evaluations the positive impact of RIS-aided solution to increase the secrecy capacity of the legitimate jamming receiver in a VLC indoor scenario. Our results show that the introduction of RIS technology extends the area where secure communication occurs and that by increasing the number of RIS elements the outage probability decreases.

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“…RIS can be well combined with high frequency band communications by creating alternative reflecting path and employing massive elements to enable high gains and reconstruct propagation path towards the target user to avoid blockage. Initial works on RIS-assisted millimeter wave (mmWave), terahertz (THz) [24]- [28], and optical [29] wireless communications are promising. Since the optical wireless communication is mainly limited to LOS propagation and easily impaired by obstacles and geometric misalignment losses, RIS can help to confront non-LOS (NLOS) propagation by creating new links to improve the coverage range and reduce the outage probability.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Intelligent Surfaces: Channel Characterization and Modeling

et al. 2022

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Reconfigurable intelligent surfaces (RISs) are two dimensional (2D) metasurfaces which can intelligently manipulate electromagnetic waves by low-cost near passive reflecting elements. RIS is viewed as a potential key technology for the sixth generation (6G) wireless communication systems mainly due to its advantages in tuning wireless signals, thus smartly controlling propagation environments. In this paper, we aim at addressing channel characterization and modeling issues of RISassisted wireless communication systems. At first, the concept, principle, and potential applications of RIS are given. An overview of RIS based channel measurements and experiments is presented by classifying frequency bands, scenarios, system configurations, RIS constructions, experiment purposes, and channel observations. Then, RIS based channel characteristics are studied, including reflection and transmission, Doppler effect and multipath fading mitigation, channel reciprocity, channel hardening, rank improvement, far field and near field, etc. RIS based channel modeling works are investigated, including largescale path loss models and small-scale multipath fading models. At last, future research directions related to RIS-assisted channels are also discussed.Index Terms-6G wireless communications, reconfigurable intelligent surface (RIS), channel measurements, channel characteristics, channel modeling.

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LiFi Through Reconfigurable Intelligent Surfaces: A New Frontier for 6G?

Cited by 8 publications

References 13 publications

Performance Analysis of RIS-Assisted FSO Communications over Fisher–Snedecor F Turbulence Channels

Performance Analysis of RIS-Assisted FSO Communications over Fisher–Snedecor F Turbulence Channels

VLC Physical Layer Security through RIS-aided Jamming Receiver for 6G Wireless Networks

Reconfigurable Intelligent Surfaces: Channel Characterization and Modeling

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