Movable Antenna Enabled ISAC Beamforming Design for Low-Altitude Airborne Vehicles

TL;DR

This paper introduces a movable antenna system for low-altitude airborne vehicles that optimizes joint beamforming and antenna positioning to enhance both sensing and communication performance in integrated systems.

Contribution

It proposes a novel ISAC-MA scheme with an SCA-based BCD algorithm for joint antenna position and beamforming optimization, improving capacity and SNR performance.

Findings

Achieves higher communication capacity compared to traditional ISAC systems.

Enhances SNR for both sensing and communication.

Outperforms benchmark schemes in numerical simulations.

Abstract

In mobile systems with low-altitude vehicles, integrated sensing and communication (ISAC) is considered an effective approach to increase the transmission rate due to limited spectrum resources. To further improve the ISAC performance, this paper proposes a novel method called integrated sensing and communication-movable antenna (ISAC-MA) to optimize the antenna's position. Our goal is to support low-space vehicles by optimizing radar and communication joint beamforming and antenna position in the presence of clutter. This scheme not only guarantees the required signal-to-noise ratio (SNR) for sensing but also further improves the SNR for communication. A successive convex approximation (SCA)-based block coordinate descent (BCD) algorithm is proposed to maximize communication capacity under the condition of sensing SNR. Numerical results show that, compared with the traditional ISAC system and various benchmark schemes, the proposed ISAC-MA system can achieve higher communication capacity under the same sensing SNR constraints.