A Flexible Design for Beam Squint Effect Suppression in IRS-Aided THz Communications
This work provides a solution to a known bottleneck (beam squint) in THz communications, which is important for high-frequency wireless systems.
The paper addresses double beam squint effect in wideband THz MISO systems by using movable antennas at the BS and movable subarrays at the IRS. The proposed algorithm maximizes minimal received power across the spectrum, and numerical results confirm its effectiveness.
In this paper, we study employing movable components on both base station (BS) and intelligent reflecting surface (IRS) in a wideband terahertz (THz) multiple-input-single-output (MISO) system, where the BS is equipped with a movable antenna (MA) array and the IRS consists of movable subarrays. To alleviate double beam squint effect caused by the coupling of beam squint at the BS and IRS, we propose to maximize the minimal received power across a wide THz spectrum by delicately configuring the positions of MAs and IRS subarrays, which is highly challenging. By adopting majorization-minimization (MM) methodology, we develop an algorithm to tackle the aforementioned optimization. Numerical results demonstrate the effectiveness of our proposed algorithm and the benefit of utilizing movable components on the BS and IRS to mitigate double beam squint effect in wideband THz communications.