Impact of Multipath Reflections on the Performance of Indoor Visible Light Positioning Systems

TL;DR

This paper investigates how multipath reflections affect indoor visible light positioning systems using VLC, analyzing signal reflections and proposing calibration methods to improve accuracy in complex environments.

Contribution

It introduces a combined deterministic and Monte Carlo method to model optical channel reflections and proposes calibration approaches to mitigate multipath effects in VLC positioning.

Findings

Reflections significantly impact positioning accuracy.

Calibration methods reduce multipath-induced errors.

Analysis covers entire room for comprehensive understanding.

Abstract

Visible light communication (VLC) using light-emitting-diodes (LEDs) has been a popular research area recently. VLC can provide a practical solution for indoor positioning. In this paper, the impact of multipath reflections on indoor VLC positioning is investigated, considering a complex indoor environment with walls, floor and ceiling. For the proposed positioning system, an LED bulb is the transmitter and a photo-diode (PD) is the receiver to detect received signal strength (RSS) information. Combined deterministic and modified Monte Carlo (CDMMC) method is applied to compute the impulse response of the optical channel. Since power attenuation is applied to calculate the distance between the transmitter and receiver, the received power from each reflection order is analyzed. Finally, the positioning errors are estimated for all the locations over the room and compared with the previous works where no reflections considered. Three calibration approaches are proposed to decrease the effect of multipath reflections.