Performance analysis of L-PPM modulated NLOS-VLC system with perfect and imperfect CSI

Abstract Visible light communication (VLC) has evolved in the last few years as an alternative to radio frequency communication technology. In this paper, the performance analysis of pulse position modulated (PPM) VLC system is presented over non-line of sight (NLOS) channel. Specifically, an L- PPM modulated VLC system is considered in which the communication occurs through single-order reflected components as there is no existence of line of sight (LOS) link between transmitter and receiver. The reflection points on the walls of the room are randomly distributed. The Gaussian approximation is used to derive the bit-error-rate (BER) of the proposed VLC system with perfect and imperfect channel state information available at the receiver. For the given transmitting power, L- PPM modulated NLOS-VLC system, ( L > 2), improves the system BER significantly than that of on-off keying modulated NLOS-VLC system. The error performance of the L -PPM modulated NLOS-VLC system is also compared with that of L -PPM modulated LOS-VLC system. For the parameters of interest, the error performance of L -PPM modulated NLOS-VLC system is observed.