Optimal Linear Precoding for Indoor Visible Light Communication System

TL;DR

This paper proposes an optimal linear precoding scheme for multi-user indoor visible light communication systems to maximize the minimum SINR, demonstrating superior performance over classical methods through simulations.

Contribution

It introduces a novel optimal linear precoding design for VLC systems that effectively mitigates inter-user interference and enhances system performance.

Findings

Proposed scheme outperforms zero-forcing precoding in simulations.

Optimal precoding improves the minimum SINR across users.

Performance gains are consistent under various working conditions.

Abstract

Visible light communication (VLC) is an emerging technique that uses light-emitting diodes (LED) to combine communication and illumination. It is considered as a promising scheme for indoor wireless communication that can be deployed at reduced costs while offering high data rate performance. In this paper, we focus on the design of the downlink of a multi-user VLC system. Inherent to multi-user systems is the interference caused by the broadcast nature of the medium. Linear precoding based schemes are among the most popular solutions that have recently been proposed to mitigate inter-user interference. This paper focuses on the design of the optimal linear precoding scheme that solves the max-min signal-to-interference-plus-noise ratio (SINR) problem. The performance of the proposed precoding scheme is studied under different working conditions and compared with the classical zero-forcing precoding. Simulations have been provided to illustrate the high gain of the proposed scheme.