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.

在过去的几年中，可见光通信（VLC）已经发展成为射频通信技术的替代方案。在本文中，对非视距（NLOS）通道上的脉冲位置调制（PPM）VLC系统进行了性能分析。具体地，考虑了L- PPM调制的VLC系统，其中，由于在发射器和接收器之间不存在视线（LOS）链路，所以通信通过单阶反射分量发生。房间墙壁上的反射点是随机分布的。高斯近似用于推导所提出的VLC系统的误码率（BER），该误码率具有在接收机处可获得的完美和不完美的信道状态信息。对于给定的发射功率，L-与开关键控调制的NLOS-VLC系统相比，PPM调制的NLOS-VLC系统（L > 2）显着提高了系统误码率。还将L -PPM调制的NLOS-VLC系统的错误性能与L -PPM调制的LOS-VLC系统的错误性能进行了比较。对于感兴趣的参数，可以观察到L -PPM调制的NLOS-VLC系统的错误性能。