Power optimization in hybrid Visible Light Communication for indoor applications

High efficiency LEDs are widely used to replace fluorescent lamps due to outstanding energy efficiency, long operational life and affordable manufacturing cost. LED contains dual fundamental applications, which are lighting illumination and Visible Light Communication (VLC). Although VLC provides several advantages when compared with RF wireless communication, duplex communication of VLC can be problematic. Hybrid visible light communication (HVLC) is proposed to solve the limitation of VLC and fulfil mobile internet requirement which integrates VLC for downlink and Wi-Fi for uplink. Visual effect based on interior design criteria is taken into account when users replace fluorescent lamp with LED. Thus, the project investigates the optimal condition between the lighting requirement and data connectivity. Two case studies are chosen to demonstrate our proposed optimization scheme namely school hall design (square topology) and hotel design (ring topology). A linear optimization scheme is proposed for received power among the mobile users in school hall (square topology) and hotel lobby (ring topology). This technique is addressed for a practical room scenario of dimension 30m × 30m × 3m where 90 users are randomly generated with different positions. Light sources placement also affected the performance of VLC. Based on our simulation, square topology have higher signal-to-noise ratio (SNR) if compared to ring topology.