Fundamental Techniques for Optical Wireless OFDM System

Abstract

Orthogonal frequency division multiplexing (OFDM) is a key technology in radio communication. The application of OFDM to optical wireless communication using intensity modulation has also been actively studied in recent years. When we use intensity modulation, the transmitted signal must be real and non-negative. Thus, it is required to generate an OFDM signal taking such restrictions into consideration. In this article, we mainly deal with direct current biased optical OFDM (DCO-OFDM), asymmetrically clipped optical OFDM (ACO-OFDM), and layered ACO-OFDM systems as basic OFDM systems that are applicable to optical wireless communication, and explain the signal structure and communication performance of those systems.