Next Generation Based Vehicular Visible Light Communications: A Novel Transmission Scheme

In this work, to tackle the line-of-sight (LoS) blockage constraint, a new transmission scheme for vehicle-to-vehicle (V2V) visible light communications (VLC) employing optical reflecting intelligent surfaces (RISs) is proposed and analyzed. To this end, the idea is to address the critical V2V-VLC LoS blockage impact concerning mobility scenarios. Moreover, multiple light-emitting diodes (LEDs)/transmitters-based headlights are employed to enhance the transmission propagation paths. Consequently, it significantly improves the overall reliability of the proposed RIS-aided V2V-VLC model. Further, to emphasize the reliability of the proposed V2V-VLC model, comprehensive path loss and energy efficiency modeling are accentuated. For the realistic V2V-VLC findings, modeling of the path loss corresponding to the intermediate communication links, i.e., between transmitter-RIS and RIS-receiver is emphasized. A novel closed-form expression of a lower bound for the required number of RIS elements to attain a targeted energy efficiency is also developed. Further, to mark interesting research insights, the performance of the proposed RIS-aided V2V-VLC scheme is also compared with the existing scheme. Furthermore, considering the key findings, it is observed that the proposed RIS-aided V2V-VLC scheme offers reliable communication despite mobility-concerned blockage. Moreover, the proposed scheme significantly outperforms the existing scheme concerning the targeted energy efficiency for the reasonable number of required RIS reflection elements. IEEE