Projeto e análise de desempenho de um sistema de comunicação por luz visível

Abstract

This work presents the implementation of a wireless communication system in visible light (VLC) using a commercial lamp composed of 7 white LEDs. The system includes the simulation, design and assembly of the electronic circuits of the transmission (Tx) and reception (Rx) system, for which the TINA-TI and EAGLE software were used. Different simulations performed for an indoor environment show that VLC systems can transmit data while maintaining the lighting recommended by the standard (≥ 500 lux). Photoradiometric measurements are made to characterize the lighting conditions. For the communication system, different codes are implemented in the MATLAB software: OOK NRZ, OOK RZ, VPPM (rc = 30%, 50%, 70%, 90%), OFDM with 4-QAM modulation and equalization. The experiments are performed for an indoor setting (laboratory) and with link in line of sight (LoS). Different configurations are proposed in which the location of the transmitter and receiver is varied and different electrical powers are used in order to find the best performance point. The performance of the Tx-Rx communication system is verified by measuring the BER vs distance, obtaining a BER ≤ 10−3 for distances up to 2 m. The performance of the LED luminaire is analyzed by illuminance levels, obtaining adequate lighting up to 1.6 m.