An Overview: Orthogonal Frequency Division Multiplexing Techniques for Visible Light Communication Systems

A great deal of attention is being paid to OFDM modulation in visible light communication systems and it because of its advantages such as reducing the intersymbol interference (ISI) and using a simple equalizer to compensate the optical channel. However, transmitted optical signals have been restricted to be real and nonnegative. Therefore, OFDM modification techniques that meet the requirement of optical signals, have played a pivotal role in wireless optical communication researches. This paper surveys and analyzes different OFDM techniques and compares them with each other.