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Vehicular visible light communication (VVLC) has emerged as a promising field of research, garnering considerable attention from scientists and researchers. VVLC offers a potential solution to enable connectivity and communication between traveling vehicles along the road by using their existing headlights (HLs) and taillights (TLs) as wireless transmitters, and integrating photodetectors (PDs) within the carfront or car-back as wireless receivers. However, VVLC encounters more challenges than indoor VLC, particularly in the context of vehicle-to-vehicle (V2V) communication, where the presence of vehicle mobility disrupts the establishment of direct communication links. To address this, we propose a multi-hop relay system in which intermediate vehicles act as wireless relays to maintain a line-of-sight (LoS) link. In this paper, we investigate the performance of a bidirectional multi-hop relay V2V-VLC system that operates in both the forward and backward directions. We derive a closed-form expression for the full bidirectional communication range based on realistic ray tracing channel models and analyze how the transceiver&#x2019;s parameters and the number of relays affect the system performance. Our results show that the proposed bidirectional multi-hop relay system can extend the direct transmission range by more than 19 m with only a hop relay.

Performance Analysis of Bidirectional Multi-Hop Vehicle-to-Vehicle Visible Light Communication