Spatial Modulation Aided Physical Layer Security for NOMA-VLC Systems

doi:10.1109/TVT.2023.3257362

Spatial Modulation Aided Physical Layer Security for NOMA-VLC Systems

2023-08-01

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DOI：10.1109/TVT.2023.3257362

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We consider the physical layer security (PLS) problem in multi-user non-orthogonal multiple access (NOMA) enabled multiple-input multiple-output (MIMO) visible light communication systems intercepted by a passive eavesdropper (Eve). We propose a novel transmit precoding scheme based on receive spatial modulation (RSM) to degrade the signal-to-interference-noise ratio (SINR) of Eve by exploiting only the slow-fading characteristics of the visible light channel of the legitimate users (Bobs). The proposed PLS precoder is reinforced with secret parameter exchange with Bobs and a CSI acquisition model is proposed to reduce the PLS algorithm's computational load substantially at the transmitter. The closed-form expressions for the achievable secrecy rates and their upper and lower bounds are derived. Via Monte Carlo simulations, we confirm that Bobs can successfully decode their information in various user configurations while Eve's received SINR is significantly worsened by the jamming signal induced by the proposed precoder with secret key exchange. It is also shown that Eve's bit error rate (BER) is increased to the 0.5-level for almost any position in the considered indoor environment. Finally, we corroborate the derived secrecy expressions by computer simulations and show that the proposed scheme provides PLS for Bobs.

Keywords:

Visible light communication

NOMA

Precoding

Wireless communication

Signal to noise ratio

Light emitting diodes

Modulation

Non-orthogonal multiple access

physical layer security

precoding

visible light communication

Spatial Modulation Aided Physical Layer Security for NOMA-VLC Systems

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