An Efficient Multi-Link Channel Model for LiFi

TL;DR

This paper introduces a novel, faster channel modeling technique for multi-link LiFi systems that combines simplified numerical calculations, frequency domain modeling, and the integrating sphere approach, validated by real measurements.

Contribution

It presents a new efficient multi-link LiFi channel model that significantly reduces computation time while maintaining accuracy, especially for diffuse reflections.

Findings

Relative mean square error below 5% for LOS signals

Faster modeling compared to previous approaches

Validated with distributed 4x2 MIMO measurements

Abstract

In this paper, we report for the first time on a new channel modelling technique for multi-link LiFi scenarios. By considering simplified numerical calculation, it models the links between multiple optical frontends and multiple mobile devices much faster than previous approaches. For the first two diffuse reflections, we replace ray-tracing method by frequency domain channel modelling technique. For the other higher order diffuse reflections, we use a well-established model based on the integrating sphere. For validation of our new approach, we performed distributed 4x2 MIMO channel measurements. Comparison of simulation and measurement yields a relative mean square error below 5 percent for the signals with a free line-of-sight. Our new technique enables efficient modeling of mobile scenarios and analyzing statistical properties of the LiFi channels.