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Angle diversity receiver as a key enabler for reliable ORIS-based Visible Light Communication

Borja Genoves Guzman, Maximo Morales-Cespedes, Ana Garcia Armada, Maite Brandt-Pearce

TL;DR

This work tackles indoor VLC link blockages by integrating angle diversity receivers (ADRs) with optical reconfigurable intelligent surfaces (ORIS). It develops a system model combining LoS and NLoS paths, an ILP-based optimization to jointly assign ORIS elements and ADR photodiodes while maximizing the minimum $SNR$ across users, and a select-best photodiode mechanism. Simulation results in a 4×4×3 m room show ORIS delivering up to $30$ dB $SNR$ gains and ADRs enabling large receiver FoV with one tier sufficing, with ADR+ORIS providing uniform SNR and higher sum-rates as user count increases. The findings demonstrate the complementary potential of ADR and ORIS to enhance reliability and fairness in multiuser VLC systems, enabling robust NLoS paths and scalable network performance.

Abstract

Visible Light Communication (VLC) offers a promising solution to satisfy the increasing demand for wireless data. However, link blockages remain a significant challenge. This paper addresses this issue by investigating the combined use of angle diversity receivers (ADRs) and optical reconfigurable intelligent surfaces (ORISs) in multiuser VLC systems. We consider ORIS elements as small movable mirrors. We demonstrate the complementarity of ADR and ORIS in mitigating link blockages, as well as the advantages of using a larger number of ORIS elements due to the increased field-of-view (FoV) at the receiver enabled by the ADR. An optimization algorithm is proposed to maximize the minimum signal-to-noise power ratio (SNR) to deploy a fair communication network. Numerical results show that integrating ADR and ORIS significantly enhances VLC communication performance, achieving an SNR gain of up to 30 dB compared to a system without ORIS, and mitigating communication outages produced by link blockages or out-of-FoV received signals. We also prove that an ADR with a single tier of photodiodes is sufficient to complement ORIS-assisted VLC.

Angle diversity receiver as a key enabler for reliable ORIS-based Visible Light Communication

TL;DR

This work tackles indoor VLC link blockages by integrating angle diversity receivers (ADRs) with optical reconfigurable intelligent surfaces (ORIS). It develops a system model combining LoS and NLoS paths, an ILP-based optimization to jointly assign ORIS elements and ADR photodiodes while maximizing the minimum across users, and a select-best photodiode mechanism. Simulation results in a 4×4×3 m room show ORIS delivering up to dB gains and ADRs enabling large receiver FoV with one tier sufficing, with ADR+ORIS providing uniform SNR and higher sum-rates as user count increases. The findings demonstrate the complementary potential of ADR and ORIS to enhance reliability and fairness in multiuser VLC systems, enabling robust NLoS paths and scalable network performance.

Abstract

Visible Light Communication (VLC) offers a promising solution to satisfy the increasing demand for wireless data. However, link blockages remain a significant challenge. This paper addresses this issue by investigating the combined use of angle diversity receivers (ADRs) and optical reconfigurable intelligent surfaces (ORISs) in multiuser VLC systems. We consider ORIS elements as small movable mirrors. We demonstrate the complementarity of ADR and ORIS in mitigating link blockages, as well as the advantages of using a larger number of ORIS elements due to the increased field-of-view (FoV) at the receiver enabled by the ADR. An optimization algorithm is proposed to maximize the minimum signal-to-noise power ratio (SNR) to deploy a fair communication network. Numerical results show that integrating ADR and ORIS significantly enhances VLC communication performance, achieving an SNR gain of up to 30 dB compared to a system without ORIS, and mitigating communication outages produced by link blockages or out-of-FoV received signals. We also prove that an ADR with a single tier of photodiodes is sufficient to complement ORIS-assisted VLC.
Paper Structure (5 sections, 9 equations, 9 figures, 1 table)

This paper contains 5 sections, 9 equations, 9 figures, 1 table.

Table of Contents

  1. Introduction
  2. System Model
  3. Proposed optimization problem
  4. Simulation results
  5. Conclusion

Figures (9)

  • Figure 1: Minimum half FoV angle required at each user position.
  • Figure 2: ADR assuming a reconfigurable photodetector architecture. The set of photodiodes follow an angular diversity arrangement connected to a single signal processing chain through selector. For the sake of generality $\varphi^{[n,u]}_{\circ}$ denotes the incidence angle at photodiode $n$ of user $u$ from the source $\circ$, either an AP or an ORIS element. The angular distribution of the azimuthal and elevation angles for a 1-Tier configuration is highlighted.
  • Figure 3: System model: 3D illustration of LoS and NLoS propagation. ORIS (mirrors) are placed forming a crown molding in the room.
  • Figure 4: CDF of SNR without ORIS elements deployed; single user.
  • Figure 5: CDF of SNR with ORIS elements deployed; single user.
  • ...and 4 more figures