Robust High Mobility NLOS UE Beamforming Strategy for Gigantic MIMO

TL;DR

This paper introduces a travel-axis-aligned UE beamforming strategy for gigantic MIMO systems that enhances link stability and data rates in high-mobility NLOS scenarios without extra pilot overhead.

Contribution

It proposes a novel beamforming approach that aligns with user movement to reduce Doppler effects and improve communication robustness in high-mobility environments.

Findings

Enhanced link robustness in simulations

Increased achievable data rates

Reduced pilot signaling and power consumption

Abstract

Maintaining robust and stable communication links in high-mobility scenarios is challenging for time-division duplex (TDD) reciprocity-based gigantic MIMO systems due to rapid channel variations, especially in non-line-of-sight (NLOS) conditions. This paper proposes a user equipment (UE) beamforming strategy that enables reliable links in high mobility without additional pilot overhead. The proposed strategy aligns the UE beamforming direction with the travel axis. Our analysis shows that this choice minimizes the Doppler spread of the channel, resulting in improved temporal stability. We evaluate this approach through simulations in scattering-rich environments representative of gigantic MIMO deployments. Numerical results confirm that movement-aligned UE beamforming enhances link robustness, increases achievable data rates, and reduces pilot signaling requirements, thereby lowering UE power consumption. These findings indicate that travel-axis-aligned UE beamforming is a promising method for improving reliability in future high-mobility wireless systems.