Study of UFMC outdoor Visible Light Communication systems with realistic LED radiation patterns and comparison with OFDM

Abstract:

Multicarrier modulation techniques are gaining popularity in Visible Light Communication (VLC). Orthogonal Frequency Division Multiplexing (OFDM) is the most widely used for now. However, other candidates are emerging to optimize Optical Wireless Communication (OWC) further. This paper proposes a study and comparison in VLC of the theoretical use of OFDM and a new waveform called Universal Filtered MultiCarrier (UFMC). In such systems, a LED (Light Emitting Diode) is used as an emitter and a piece of photosensitive equipment as a receiver of the optical signal. As OFDM and UFMC are modulation schemes developed for Radio Frequency (RF) technologies, adaptations are needed to send the desired data through light. The two main constraints are the need for a real and positive electrical signal converted to light intensity variations. The present work highlights several manners to respect these constraints and the general architecture of the simulation. On top of the use of UFMC, the originality of our paper is the use of realistic LED optical spatial distributions and photodiode models to conduct the simulations. Finally, the paper discusses the system's performance in terms of Bit Error Rate (BER), spectral efficiency, and complexity of the algorithm.

DOI:

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