Absolute Security with Digital Beamforming for High-Frequency Links

Absolute security relies on radiation patterns with diverse radiation minima across a wideband transmission. While radiation minima naturally shift with frequency, the change is minimal within typical communication bandwidth. In this paper, we propose to achieve high diversity in radiation minima with digital beamforming. With our proposed zero-forcing-based minimum steering, we demonstrate a significant secure region using 802.11ay parameters, indicating a promising direction to realize absolute security using digital beamformers.