2 research outputs found
Leakage Subspace Precoding and Scheduling for Physical Layer Security in Multi-User XL-MIMO Systems
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.Comment: 5 pages and 4 figures. This work has been submitted to the IEEE for
possible publication. Copyright may be transferred without notice, after
which this version may no longer be accessibl