Error performance of an L-PPM modulated ADR-based MIMO-VLC system with and without channel estimation error

In recent years, visible light communication (VLC) has emerged as a potential technique for beyond 5G communication networks. In this study, an angular diversity receiver (ADR) is used to propose a multiple-input multiple-output (MIMO) VLC system employing L-pulse position modulation (L-PPM). Repetition coding (RC) is used at the transmitter, while receiver diversity techniques such as maximum-ratio combining (MRC), selection best combining (SBC), and equal gain combining (EGC) are used at the receiver to improve performance. This study presents the exact probability of error expressions for the proposed system with and without channel estimation error (CEE). The analysis shows that the probability of error of the proposed system increases as the estimation error increases. Further, the study shows that the increase in signal-to-noise ratio is not enough to counter the impact of CEE, especially when the estimation error is large. The distribution of error probability of the proposed system using EGC, SBC, and MRC throughout the area of the room is presented. The simulation findings are compared to the analytical results.