An Artificial-Noise-Based Approach for the Secrecy Rate Maximization of MISO VLC Wiretap Channel With Multi-Eves

Ge Shi,Wei Cheng,Yong Li,Wenjie Zhang,Xiang Gao

doi:10.1109/access.2020.3046664

Abstract

In this paper, we consider improving the secure performance of multiple-input single-output visible light communication channel in the presence of multiple eavesdroppers with multiple photodiodes. Our goal is to design an optimal artificial-noise (AN) aided transmission strategy to maximize the achievable secrecy rate subject to both sum power constraint and peak amplitude constraint. We consider a joint optimization of the transmit covariance and AN covariance for the non-convex secrecy rate maximization (SRM) problem. In order to solve it, the SRM problem is transformed into a series of single-variable semidefinite programming (SDP) problems without losing any optimality, and a one-dimensional search based algorithm is proposed to handle the converted problem, with polynomial complexity. By exploiting Karush-Kuhn-Tucker conditions of the problem, beamforming is found to be optimal for the confidential information transmission. Simulation results show the superior performance of the proposed AN-aided method compared with two other AN-aided methods and no AN-aided method.

Highlights

VISIBLE light communication (VLC) is a promising technology that has attracted growing interest in the last decade due to its combination of communication and illumi- nation
SIMULATION RESULTS we investigate the secure performance of the proposed system in an indoor environment
This paper has investigated an AN-aided secrecy rate maximization (SRM) problem for a multiple-input single-output (MISO)-VLC wiretap channel overheard by multiple Eves equipped with multiple PDs

Summary

Introduction

VISIBLE light communication (VLC) is a promising technology that has attracted growing interest in the last decade due to its combination of communication and illumi- nation. VLC has achieved rapid developments in many research fields, such as indoor localization [2], [3], vehicle to vehicle (V2V), vehicle to things (V2I) communication [4] and transceiver design [5], etc. Extensive research has been carried out to improve the secure performance of VLC systems by using techniques in both upper layer [8] and physical layer [9]. Physical layer security (PLS) has emerged as a promising technique to safeguard wireless communications and complement conventional encryption techniques.

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