Joint Beamforming and 3D Location Optimization for Multi-User Holographic UAV Communications

TL;DR

This paper introduces a novel joint optimization framework for hybrid holographic beamforming and 3D UAV positioning in multi-user UAV communications, significantly improving network sum rate and adaptability.

Contribution

It presents the first integrated approach combining holographic beamforming and UAV positioning optimization using an iterative algorithm for next-generation aerial wireless networks.

Findings

Enhanced sum rate compared to benchmarks

Effective trade-off management between power, beamforming, and UAV trajectory

Demonstrated adaptability under varying network conditions

Abstract

This paper pioneers the field of multi-user holographic unmanned aerial vehicle (UAV) communications, laying a solid foundation for future innovations in next-generation aerial wireless networks. The study focuses on the challenging problem of jointly optimizing hybrid holographic beamforming and 3D UAV positioning in scenarios where the UAV is equipped with a reconfigurable holographic surface (RHS) instead of conventional phased array antennas. Using the unique capabilities of RHSs, the system dynamically adjusts both the position of the UAV and its hybrid beamforming properties to maximize the sum rate of the network. To address this complex optimization problem, we propose an iterative algorithm combining zero-forcing digital beamforming and a gradient ascent approach for the holographic patterns and the 3D position optimization, while ensuring practical feasibility constraints. The algorithm is designed to effectively balance the trade-offs between power, beamforming, and UAV trajectory constraints, enabling adaptive and efficient communications, while assuring a monotonic increase in the sum-rate performance. Our numerical investigations demonstrate that the significant performance improvements with the proposed approach over the benchmark methods, showcasing enhanced sum rate and system adaptability under varying conditions.