A novel hemispherical visible light transmitter design for multi-user optical beamforming in wireless communication

In this article, we present a hemispherical transmitter design for multi-user optical beamforming (MU-OB) using visible light. MU-OB technique involves focusing light-emitting diode light on a target, to enhance the received signal-to-noise ratio. The MU-OB technique integrates a micro-genetic optimization algorithm (\(\mu\)-GOA) to optimize LED power. The \(\mu\)-GOA represents a significant development in the field of directional LED design. As it guides the selection of LEDs that will improve the signal strength of the LED at the receiver, regardless of location. MU-OB in visible light communication systems can improve the SNR at the RX. And minimize the time required to estimate the user’s position. Also, the MU-OB technique increases the VLC’s data rate. We have simulated the proposed MU-OB technique using hemispherical TX for various user positions to ensure its feasibility and robustness. Besides \(\mu\)-GOA, we compared the MU-OB technique using the simple genetic algorithm (sGA). The result shows that the MU-OB technique using \(\mu\)-GOA as compared to sGA achieves the SNR at the user position of 61 which increases by 0.2 dB after beamforming. And, beamforming improves the SNR at user positions, 1 and 121 by 0.8 dB and, 0.7 dB respectively.