Error Analysis of L-PPM modulated ADT based VLC System with Perfect and Imperfect CSI

In this paper, L-pulse position modulation (PPM) is implemented with angle diversity transmitter based visible light communication (ADT-VLC) system in indoor environment. The error performance of ADT-VLC system using L-PPM modulation with perfect and imperfect CSI is presented. The closed-form expressions for BER of ADT-VLC system using L-PPM modulation with perfect and imperfect CSI are derived. In the presence of perfect and imperfect CSI, the error performance of an ADT-VLC system using L-PPM modulation is compared to an ADT-VLC system using OOK modulation. Effect of different channel estimation error values on BER of the proposed system is analyzed. The SNR distribution of ADT-VLC system using L-PPM modulation is also evaluated for higher modulation order. The analytical and simulated findings are comparable.