Impact of Optical Reconfigurable Intelligent Surfaces on Channel Estimation for VLC Systems
TL;DR
It is shown that spectral efficiency values of approximately 5 bits/s/Hz are achievable using ORIS with PSAM, a performance comparable to, or even exceeding, that of unobstructed line-of-sight links.
Abstract
Visible light communication (VLC) offers wireless data connectivity indoors, yet its performance is severely limited by link blockages. While optical reconfigurable intelligent surfaces (ORISs) have been proposed to overcome these blockages, existing literature predominantly relies on the unrealistic assumption of ideal channel state information. In this paper we investigate the contribution of ORIS elements in VLC systems under practical, non-ideal channel estimation scenarios. We analyze the communication performance using two pilot-based estimation techniques: pilot symbol assisted modulation (PSAM) and superimposed training (ST), evaluating the impact of data power allocation factors and averaged orthogonal frequency division multiplexing (OFDM) symbols. Our results show that PSAM with an ORIS deployment enables optimal large data power allocation factors, resulting in spectral efficiency improvements that surpass scenarios with ideal channel estimates but without ORIS deployment. While ST performs well with a large number of averaged OFDM symbols, it is unable to overcome the performance of PSAM when ORIS elements are deployed. We also find the system robust to imperfect ORIS orientation; even with only half of the elements accurately aligned, performance remains acceptable. Ultimately, we show that spectral efficiency values of approximately 5 bits/s/Hz are achievable using ORIS with PSAM, a performance comparable to, or even exceeding, that of unobstructed line-of-sight links.