Abstract

Visible Light Communication (VLC) is expected to form a vital part of wireless communication in the near future. VLC is basically communication system that employs light source as transmitter, light as optical carrier of information and photosensitive element as receiver. Dual link VLC can be limited by transmitter half power angle, receiver Field of View (FOV), shadowing, multipath delay, ambient interference, etc. This work studies the FOV aspect. The FOV of receiver signifies its spatial light capturing ability, hence, the need to look into how its variation affects the entire VLC link design. This work builds on our previous study, of which the transmitter configuration found in the study is adopted here. In this work, an investigation is conducted into how alterations in receiver FOV affects power in VLC. The methodology employed considers the non-directed Line of Sight (LoS) channel having 2 links alongside models for transmitter, receiver and power in indoor settings. FOV alterations are then applied on the system. MATLAB was used to run the simulations. The results obtained showed that at lower FOVs, there exists dead zones in the environment, with 72.96% at 10° receiving no power. The maximum received power was 13.5326mW with minimum being 0.0426mW but power uniformity was just 0.0236. At larger angles beyond 40°, no dead zones exist as all portions now receive power. The minimum received power at 70° improved to 0.6016mW and maximum received power was 2.4425mW. With the wider angles, uniformity continuously got better to around 0.4131 at 70° which is over 17 times better than at 10°. These findings indicate more even and more mobile operation of the receiver at higher angles and the numerical results can help future system designs that may use the adopted transmitter configuration.

Key words: VLC, received power, power uniformity, FOV, dead zones