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arXiv · 2205.11335

Leakage Subspace Precoding and Scheduling for Physical Layer Security in Multi-User XL-MIMO Systems

Gonzalo J. Anaya-Lopez·Jose P. Gonzalez-Coma·F. Javier Lopez-Martinez
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Abstract

We investigate the achievable secrecy sum-rate in a multi-user XL-MIMO system, on which user distances to the base station become comparable to the antenna array dimensions. We show that the consideration of spherical-wavefront propagation inherent to these set-ups is beneficial for physical-layer security, as it provides immunity against eavesdroppers located in similar angular directions that would otherwise prevent secure communication under classical planar-wavefront propagation. A leakage subspace precoding strategy is also proposed for joint secure precoding and user scheduling, which allows to improve the secrecy sum-rate compared to conventional zero-forcing based strategies, under different eavesdropper collusion strategies.

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Gonzalo J. Anaya-Lopez, Jose P. Gonzalez-Coma, F. Javier Lopez-Martinez. 2022-05-23. Leakage Subspace Precoding and Scheduling for Physical Layer Security in Multi-User XL-MIMO Systems. https://arxiv.org/abs/2205.11335

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