Pinching Antenna-Assisted Full-Duplex Communication Systems

2026-09-24

AI Summary

This study addresses the challenges of self-interference suppression and the limited spatial degrees of freedom inherent in fixed antenna arrays for full-duplex communications. To overcome these limitations, this work proposes a movable antenna-aided architecture that enables large-scale channel reconfiguration by dynamically adjusting transmit and receive antenna positions. Aiming to maximize the weighted sum rate, an alternating optimization algorithm is developed based on the weighted minimum mean square error (WMMSE) framework to jointly optimize antenna positioning, beamforming, and power allocation. Numerical results demonstrate that the proposed scheme significantly outperforms conventional fixed-array counterparts, effectively mitigating self-interference while substantially enhancing the overall system throughput.

Abstract

Full-duplex (FD) communication theoretically doubles spectral efficiency. Despite this potential, its practical performance is primarily constrained by severe self-interference (SI) and co-channel interference. Moreover, conventional fixed antenna arrays suffer from limited spatial flexibility, resulting in insufficient spatial isolation for SI suppression. To address this issue, this letter proposes an FD architecture assisted by pinching antenna systems (PASS). By dynamically adjusting transmit and receive antenna positions, the system enables large-scale channel reconfiguration, thereby synergizing with the base station (BS) beamforming to suppress SI and enhance the desired signal reception. To demonstrate the potential of PASS for FD communication, we formulate a weighted sum-rate maximization problem that jointly optimizes antenna positions, BS beamforming, and power allocation. To tackle this non-convex problem, we reformulate it using the weighted minimum mean square error (WMMSE) framework and develop an efficient alternating optimization (AO) algorithm to iteratively update the optimization variables. Simulation results reveal that the proposed PASS-assisted FD architecture significantly outperforms conventional fixed antenna arrays, achieving substantial sum-rate gains while effectively mitigating SI to enable FD operation.

Problem

• Full-duplex communication
• Self-interference
• Pinching antenna systems
• Spectral efficiency

Innovation

• Full-Duplex Communication
• Pinching Antenna System (PASS)
• Self-Interference Suppression
• Alternating Optimization
• WMMSE