Physical Layer Security Enhancement in VLC Using Zero-Forcing Beamforming and Optimized LED Placement

Mohammadi, Mahmoud; Sadough, Seyed Mohammad Sajad; Ghassemlooy, Zabih

doi:10.1109/csndsp54353.2022.9907923

Cited by 4 publications

(8 citation statements)

References 21 publications

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“…In [18], we proposed a fully numerical method to find the location of the transmitters, by minimizing the outage probability at the receivers which are randomly distributed in a corridor environment. More recently, in [19], we addressed the physical layer security (PLS) of the VLC link in a room by optimizing the location of the transmitters to reduce the secrecy outage probability.…”

Section: Literature Surveymentioning

confidence: 99%

“…Notice from ( 21) that in the case of static users, the average outage probability Pout is easily obtained by replacing Ũl by Ûl in the local outage probability P out ( Ũl ) in Equation (19). So, by taking the derivative of Pout = P out ( Ûl ) with respect to vx k and vy k , the optimal location of the LEDs which minimize the average outage probability can be found, as explained in what follows.…”

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confidence: 99%

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Improved LED arrangement through outage probability minimization in LiFi communication systems

Mohammadi

Sadough

2023

IET Communications

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In this paper, an improved method to arrange the light emitting diodes (LED) on the ceiling for an indoor visible light communication (VLC) system is proposed. More precisely, a LiFi‐based connection is considered where several LEDs are placed on the ceiling of an office and communicate with several receiver (user) located randomly within the room area. It is proposed to find the optimal location of the LEDs by minimizing the outage probability at the user's location. Both cases of static and mobile users are addressed. First, the closed‐form expression for the outage probability at the user's location is derived. Then, by minimizing the average outage probability, the optimal location of the LEDs is found. The numerical results show that the proposed LED arrangement outperforms the classically used uniform LED arrangement in terms of average outage probability at the receiver and reduces the necessary signal‐to‐noise ratio (SNR) to achieve a target average outage probability by about 3 and 2.2 dB for mobile and static users, respectively. They also show that the performance superiority of the proposed method over classical arrangement remains valid even under large estimation errors.

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Section: Literature Surveymentioning

confidence: 99%

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Improved LED arrangement through outage probability minimization in LiFi communication systems

Mohammadi

Sadough

2023

IET Communications

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“…In continuation of the idea presented in Ref. [18], here we propose to improve the average SOP by optimising the beamforming weights along with optimising the location of the LEDs. Our main contributions in this paper can be summarised as follows:…”

Section: Main Contributionsmentioning

confidence: 99%

“…Then, by using a specific cost function, we formulate an optimisation problem for deriving the closed-form expression of the optimal beamforming weights, which characterises the essence of the proposed method. In Section 4, we derive an expression for the instantaneous received SNR in the LOS channel, the secrecy capacity and the SOP, which is used as a metric to determine the optimal arrangement of the LEDs at [8,9] SNR fluctuation Circular [10] Average area spectral efficiency Rectangular [11,17] Data rate Rectangular [4,6,12,13] Outage performance Rectangular [14,15] Blockage Random [18] and this work Secrecy outage probability Rectangular 102 the legitimate Rx. In Section 5, we present our simulation results and performance evaluation and finally in Section 6, we summarise our main results and we draw our conclusions.…”

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confidence: 99%

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Enhanced secrecy outage probability for multiple‐input single‐output‐VLC systems through optical beamforming and improved light emitting diodes deployment

Mohammadi

Sadough

Ghassemlooy

2023

IET Optoelectronics

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The authors propose to arrange the light emitting diodes (LEDs) on the ceiling for an indoor visible light communication system in order to minimise the secrecy outage probability (SOP) at the location of the legitimate user (LU). More precisely, by deriving the secrecy capacity for a multiple‐input single‐output‐VLC system, we evaluate the SOP at the LU's location which is used as the appropriate metric to determine the position of the LEDs on the ceiling. To mitigate the effect of the eavesdropper, we derive the optimal beamforming coefficients which are used at the transmitter LED array with the aim of maximising the signal‐to‐noise ratio at the LU. Simulation results show that for a SOP of 10−4, the proposed SOP‐based LED arrangement with optimal beamforming offers up to 3 dB gain in transmit power compared to the classical uniform LED arrangement with sub‐optimal zero‐forcing beamforming. Moreover, they show that by using the proposed method, the SOP is kept below a desired threshold, over a wider area inside the indoor environment compared to classical methods.

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Physical‐Layer Security for Optical Wireless Communications

Huang,

Dehghani Soltani,

Safari

2024

Physical‐Layer Security for 6G

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Physical Layer Security Enhancement in VLC Using Zero-Forcing Beamforming and Optimized LED Placement

Cited by 4 publications

References 21 publications

Improved LED arrangement through outage probability minimization in LiFi communication systems

Improved LED arrangement through outage probability minimization in LiFi communication systems

Enhanced secrecy outage probability for multiple‐input single‐output‐VLC systems through optical beamforming and improved light emitting diodes deployment

Physical‐Layer Security for Optical Wireless Communications

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