Secure NOMA-Assisted Multi-LED Underwater Visible Light Communication

Kumar, Ambrish; Jayakody, Dushantha Nalin K.

doi:10.1109/tvt.2022.3167992

Cited by 17 publications

(2 citation statements)

References 35 publications

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“…where a(λ) and b(λ) denote the absorption and scattering coefficients for underwater light propagation, respectively. When the optical signal is transmitted in fresh water under the absence of turbulence, the channel gain h ij for the line-of-sight (LOS) UVLC system can be defined as [15]…”

Section: A Channel Modelmentioning

confidence: 99%

Hybrid Space Division Multiple Access and Quasi-Orthogonal Multiple Access for Multi-User Underwater Visible Light Communication

Qian

Chen

et al. 2023

IEEE Photonics J.

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Due to severe inter-beam interference and high cost of conventional full space division multiple access (SDMA)-based multi-user underwater visible light communication (MU-UVLC) systems, partial SDMA has been considered to substantially reduce inter-beam interference and costs by enabling closely located users to share the same light beam. Moreover, non-orthogonal multiple access (NOMA) is generally adopted to multiplex users in the same beam. However, for users with similar channel gains, the use of NOMA may suffer from severe error propagation. To this end, we propose and demonstrate a hybrid SDMA and quasi-orthogonal multiple access (QOMA) scheme for performance enhancement of partial SDMA-based MU-UVLC systems. Simulation and experimental results show that, in two-user UVLC system applying hybrid SDMA/QOMA, the bit error rate (BER) performance of the near user can be substantially improved and a much wider range of effective power allocation ratio can be achieved compared with that using conventional hybrid SDMA/NOMA.

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Section: A Channel Modelmentioning

confidence: 99%

Hybrid Space Division Multiple Access and Quasi-Orthogonal Multiple Access for Multi-User Underwater Visible Light Communication

Qian

Chen

et al. 2023

IEEE Photonics J.

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“…a malicious node that never shares its CSI with transmitter) [26]. Recently, in [27], a secure NOMAassisted multi-LED underwater VLC network is presented where the secrecy rate metric is defined against both active and passive eavesdropping attacks with an assumption that an error-free CSI estimation is possible at the receiver node. However, due to the variable underwater channel conditions and the occurrence of Gaussian distribution errors, the precise error-free CSI estimation at the receiver node is practically impossible [28].…”

Section: Introductionmentioning

confidence: 99%

Security Performance Analysis of a NOMA-Assisted Underwater VLC System Under Imprecise Channel Estimations

et al. 2022

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The accurate estimation of underwater Visible Light Communication (VLC) channel conditions is challenging due to its widespread attenuation and scattering effects. The channel attenuation is a linear function of frequency and causes exponential signal power loss whereas due to the scattering effect, numerous photons are statistically generated as light beams strike water molecules and there arise security concerns. Assuming realistic underwater conditions, this paper investigates the security performance of a typical Non-Orthogonal Multiple Access (NOMA)-assisted underwater VLC system. It consists of a Floating Vehicle Transmitter (FVT), equipped with multiple Light Emitting Diodes (LEDs) to transmit the signal to two legitimate near-end and far-end Underwater Vehicles (UVs) in presence of an active/passive eavesdropper. The Channel State Information (CSI) of each transmitting link is estimated with the use of a Minimum Mean Square Error (MMSE) technique. Furthermore, we propose a LED selection mechanism to select an LED that can achieve the highest secrecy rate defined under the constraints of known and unknown CSI of legitimate and/or eavesdropping links. Using the Successive Interference Cancellation (SIC) technique, a novel closed-form secrecy outage probability expressions for the conventional single-LED and multi-LED NOMA-VLC links for both known and unknown CSI scenarios is derived. The security performance of the proposed multi-LED NOMA-VLC system is compared with the conventional single-LED NOMA-VLC system under the effect of air bubbles for both fresh and salty water. Finally, we verify the validity of the numerical results through Monte-carlo simulation analysis.INDEX TERMS Non-orthogonal multiple access, physical layer security, secrecy capacity, secrecy outage probability and underwater visible light communication.

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Conjugate Gradient Derived Kernel Affine Projection Method for Post-distortion in Visible Light Communication Systems

Shen,

Wang,

Kang

et al. 2024

Wireless Pers Commun

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Secure NOMA-Assisted Multi-LED Underwater Visible Light Communication

Cited by 17 publications

References 35 publications

Hybrid Space Division Multiple Access and Quasi-Orthogonal Multiple Access for Multi-User Underwater Visible Light Communication

Hybrid Space Division Multiple Access and Quasi-Orthogonal Multiple Access for Multi-User Underwater Visible Light Communication

Security Performance Analysis of a NOMA-Assisted Underwater VLC System Under Imprecise Channel Estimations

Conjugate Gradient Derived Kernel Affine Projection Method for Post-distortion in Visible Light Communication Systems

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