Indoor Location Estimation with Optical-based OFDM Communications

TL;DR

This paper introduces a novel OFDM-based VLC system for indoor communication and positioning, demonstrating improved accuracy over traditional schemes and analyzing the effects of system parameters on performance.

Contribution

The paper proposes a new OFDM VLC system that supports both data transmission and precise indoor positioning, outperforming conventional modulation schemes.

Findings

OFDM-based VLC achieves lower positioning errors than OOK.

System parameter variations significantly affect positioning accuracy.

OFDM enhances indoor communication and localization performance.

Abstract

Visible Light Communication (VLC) using light emitting diodes (LEDs) has been gaining increasing attention in recent years as it is appealing for a wide range of applications such as indoor positioning. Orthogonal frequency division multiplexing (OFDM) has been applied to indoor wireless optical communications in order to mitigate the effect of multipath distortion of the optical channel as well as increasing data rate. In this paper, a novel OFDM VLC system is proposed which can be utilized for both communications and indoor positioning. A positioning algorithm based on power attenuation is used to estimate the receiver coordinates. We further calculate the positioning errors in all the locations of a room and compare them with those using single carrier modulation scheme, i.e., on-off keying (OOK) modulation. We demonstrate that OFDM positioning system outperforms its conventional counterpart. Finally, we investigate the impact of different system parameters on the positioning accuracy of the proposed OFDM VLC system.