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Integration of Dimming into LiFi Systems

This paper investigates practical solutions to control the brightness of a visible light-based Light Fidelity (LiFi) system. The main objective is to achieve a wide dimming range while maintaining a high communication performance. Experimental studies are presented on the integration of dimming techniques into a communication system using a National Instruments (NI) PXIe-1085 and a NI-7966R Field Programmable Gate Array (FPGA). Pulse-width-modulation (PWM) dimming and amplitude-modulation (AM) dimming are applied to direct current (DC)-biased optical frequency division multiplexing (DCO-OFDM) and augmented spectral efficiency discrete multi-tone (ASE-DMT) modulation schemes. A reliable communication link with a measured Q-factor over 15 dB is realized at dimming levels between 5% and 95%. The performance comparison demonstrates that ASE-DMT is more suitable for dimming applications with up to a 7 dB higher Q factor than that of DCO-OFDM.