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On the Jamming Rejection Features of Near-Field Beamforming

Ferreira, J. ; Guerreiro, J. ; Dinis, R. ; Silva, M.

On the Jamming Rejection Features of Near-Field Beamforming, Proc IEEE IEEE 97th Vehicular Technology Conference: VTC2023-Spring VTC2023-Spring, Florence, Italy, Vol. , pp. - , June, 2023.

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Abstract
Large multiple antenna systems have been widely used in 5G for improved spectral efficiencies. For 6G, even bigger arrays are being proposed to obtain larger gains and/or to reduce interference levels. When the physical size of the array is large compared to the propagation distance, communication might occur in the near-field regime, which requires channel models that capture the curvature of the spherical waves. In this paper, we consider the near-field communication regime and study the jamming rejection features of an extremely large array (ELAA). Due to the focusing effect available in the near-field, it is shown that the jamming rejection features in this region are much stronger than the ones associated with far-field. Therefore, near-field beam-focusing constitutes an interesting physical layer security (PLS) technique for 6G communications.