Joint Discrete Antenna Positioning and Beamforming Optimization in Movable Antenna Enabled Full-Duplex ISAC Networks

TL;DR

This paper introduces a movable antenna-enabled full-duplex ISAC system that optimizes antenna positions and beamforming to reduce power consumption, employing a BPSO algorithm for solving complex non-convex optimization problems.

Contribution

It proposes a novel joint optimization framework for discrete antenna positioning and beamforming in movable antenna ISAC networks, solved via a BPSO algorithm.

Findings

Significantly reduces total transmit power compared to fixed antenna systems.

Demonstrates the effectiveness of movable antennas in enhancing spatial diversity.

Validates the proposed optimization approach through numerical simulations.

Abstract

In this paper, we propose a full-duplex integrated sensing and communication (ISAC) system enabled by a movable antenna (MA). By leveraging the characteristic of MA that can increase the spatial diversity gain, the performance of the system can be enhanced. We formulate a problem of minimizing the total transmit power consumption via jointly optimizing the discrete position of MA elements, beamforming vectors, sensing signal covariance matrix and user transmit power. Given the significant coupling of optimization variables, the formulated problem presents a non-convex optimization challenge that poses difficulties for direct resolution. To address this challenging issue, the discrete binary particle swarm optimization (BPSO) algorithm framework is employed to solve the formulated problem. Specifically, the discrete positions of MA elements are first obtained by iteratively solving the fitness function. The difference-of-convex (DC) programming and successive convex approximation (SCA) are used to handle non-convex and rank-1 terms in the fitness function. Once the BPSO iteration is complete, the discrete positions of MA elements can be determined, and we can obtain the solutions for beamforming vectors, sensing signal covariance matrix and user transmit power. Numerical results demonstrate the superiority of the proposed system in reducing the total transmit power consumption compared with fixed antenna arrays.