Optimization of an OFDM-Modulated Visible Light Communication Link based on Experimental Approach

Visible Light Communications (VLC) allows the use of the existing lighting infrastructure to transmit data, however, the limited bandwidth of commercial LEDs prevents high data rate systems from being achieved. In this work, an experimental procedure was employed to improve the data transmission rate of an OFDM-modulated link. The results shows that by optimizing the system parameters, a bandwidth greater than the LED 3-dB bandwidth can be utilized, while maintaining the illumination at a minimum of 300 lux. Based on the optimized configuration, a data rate of 96 Mbps using a 16-QAM constellation was achieved for a BER \leq 10{^{-3}} at a distance of 2 m.