Performance analysis of fast optical OFDM for VLC

The dual property of LEDs to facilitate illumination and Communication concurrently has driven Visible Light Communication (VLC) as an emerging technology and a promising alternative to Radio Frequency (RF) Communication. The primary objective of VLC is to increase the data rates and to have better performance of the networks especially for indoor applications. In this juncture, for the purpose of increasing the Information Spectral Density (ISD), Fast Optical Orthogonal Frequency Division Multiplexing (FOOFDM) can be exploited. In this work, the performance of FOOFDM is evaluated by employing various channel estimation algorithms and Probability of Error expression is derived for the developed system models. In addition, investigations on channel estimation in DC Biased Optical OFDM (DCO-OFDM) is carried out where, the result analysis emphasize that, FOOFDM is superior in terms of both power efficiency and spectral efficiency when compared to DCO-OFDM. Employing a real-valued transform and its simple one dimensional modulation, makes FOOOFM to exhibit lower computational complexity when compared with hermitian symmetry imposed optical OFDM (DCO-OFDM).