Impact of the Refractive Index on the Achievable Rate of Liquid Crystal-Based Digital-RIS Indoor VLC Systems

In wireless networks, reconfigurable intelligent surfaces (RISs) have recently been proven to have a significant impact. The RIS has been incorporated into wireless communication systems to improve security, increase coverage, reduce interference, and improve transmission quality. Digital RIS (DRISs...

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Bibliographic Details
Published in:IEEE photonics journal 2023-02, Vol.15 (1), p.1-6
Main Authors: Ndjiongue, Alain R., Ngatched, Telex M. N., Dobre, Octavia A.
Format: Article
Language:English
Subjects:
Communication
Digital reconfigurable intelligent surfaces (DRISs)
Electrodes
emerged light power
indoor visible light communication systems
Light sources
liquid crystal-based DRIS
Liquid crystals
Optical communication
Receivers
Reconfigurable intelligent surfaces
Reflection
Refractive index
Refractivity
transmission rate
Visible light communication
Voltage control
Wireless communication systems
Wireless networks
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Summary:In wireless networks, reconfigurable intelligent surfaces (RISs) have recently been proven to have a significant impact. The RIS has been incorporated into wireless communication systems to improve security, increase coverage, reduce interference, and improve transmission quality. Digital RIS (DRISs) have also proven to provide better reflection management. However, the impact of the DRIS intrinsic parameters on the system's achievable rate, has not yet been investigated. Due to their availability and easily reconfigurable properties, liquid crystals (LCs) appear as suitable materials for use in DRIS, specifically in optical communication systems. This paper analyzes the effect of the LC's refractive index on the achievable rate of LC-based DRIS indoor visible light communication systems. Based on a set of discrete phase shifts, required refractive indices have been evaluated. The reflected power and achievable rates are determined with respect to incoming light wavelengths at 510 nm, 550 nm, and 670 nm. According to the obtained numerical results, there is no linear relationship between refractive indices, corresponding transition coefficients, phase shifts, light power, and achievable rate.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2022.3230749