6D Movable Antenna Enhanced Interference Mitigation for Cellular-Connected UAV Communications

TL;DR

This paper introduces a 6D movable antenna array system to improve interference mitigation in cellular-connected UAV communications, significantly outperforming traditional fixed antennas.

Contribution

It proposes a novel 6D movable antenna array approach with an optimization algorithm to enhance interference mitigation for UAVs in cellular networks.

Findings

6DMA arrays outperform fixed antennas in interference suppression

The proposed algorithm effectively optimizes antenna positioning and beamforming

Significant SINR improvements demonstrated through numerical results

Abstract

Cellular-connected unmanned aerial vehicle (UAV) communications is an enabling technology to transmit control signaling or payload data for UAVs through cellular networks. Due to the line-of-sight (LoS) dominant air-to-ground channels, efficient interference mitigation is crucial to UAV communications, while the conventional fixed-position antenna (FPA) arrays have limited degrees of freedom (DoFs) to suppress the interference between the UAV and its non-associated co-channel base stations (BSs). To address this challenge, we propose in this letter a new approach by utilizing the six-dimensional movable antenna (6DMA) arrays to enhance the interference mitigation for the UAV. Specifically, we propose an efficient block coordinate descent (BCD) algorithm to iteratively optimize the antenna position vector (APV), array rotation vector (ARV), receive beamforming vector, and associated BS of the UAV to maximize its signal-to-interference-plus-noise ratio (SINR). Numerical results show that the proposed 6DMA enhanced cellular-connected UAV communication can significantly outperform that with the traditional FPA arrays and other benchmark schemes in terms of interference mitigation.