Suppressing Beam Squint Effect For Near-Field Wideband Communication Through Movable Antennas
Addresses beam squint in near-field wideband communications, a practical bottleneck for 6G systems, with a novel antenna configuration approach.
This work proposes using movable antenna arrays to suppress beam squint in near-field wideband MISO systems, achieving improved beamforming gain across the spectrum. Numerical results validate the effectiveness of the proposed algorithms.
In this correspondence, we study deploying movable antenna (MA) array in a wideband multiple-input-single-output (MISO) communication system, where near-field (NF) channel model is considered. To alleviate beam squint effect, we propose to maximize the minimum analog beamforming gain across the entire wideband spectrum by appropriately adjusting MAs' positions, which is a highly challenging task. By introducing a slack variable and adopting the cutting-the-edge smoothed-gradient-descent-ascent (SGDA) method, we develop algorithms to resolve the aforementioned challenge. Numerical results verify the effectiveness of our proposed algorithms and demonstrate the benefit of utilizing MA array to mitigate beam squint effect in NF wideband system.