Near-field hybrid beamforming for Terahertz-band Integrated Sensing and Communications

Elbir, Ahmet M., Celik, Abdulkadir and Eltawil, Ahmed M. (2023) Near-field hybrid beamforming for Terahertz-band Integrated Sensing and Communications. In 2023 IEEE Globecom Workshops, GC Wkshps 2023. IEEE. pp. 1117-1122 . (doi:10.1109/GCWkshps58843.2023.10464709).

Record type: Conference or Workshop Item (Paper)

Abstract

Terahertz (THz) band communications and integrated sensing and communications (ISAC) are two main facets of the sixth generation wireless networks. In order to compensate the severe attenuation, the THz wireless systems employ large arrays, wherein the near-field beam-squint severely degrades the beamforming accuracy. Contrary to prior works that examine only either narrowband ISAC beamforming or far-field models, we introduce an alternating optimization technique for hybrid beamforming design in near-field THz-ISAC scenario. We also propose an efficient approach to compensate near-field beam-squint via baseband beamformers. Via numerical simulations, we show that the proposed approach achieves satisfactory spectral efficiency performance while accurately estimating the near-field beam- formers and mitigating the beam-squint without additional hardware components.

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