Full duplex communication improved by movable antennas and smart beamforming
Pinching Antenna-Assisted Full-Duplex Communication Systems
Information Theory
Summary
Full-duplex communication can send and receive signals simultaneously which could double network speed but usually suffers from interference problems. The paper proposes a system that moves antennas around to limit this interference dynamically, working together with smart signal focusing methods. This approach lets the system better separate the signals it sends from the ones it receives to improve overall performance. The authors tested their idea in simulations and found it outperforms traditional fixed antenna setups.
What this means in practice
- •For wireless network engineers: Design wireless base stations that dynamically adjust antenna positions to reduce interference and increase data throughput in full-duplex systems.
- •For telecommunications equipment manufacturers: Develop adaptive antenna arrays that integrate with beamforming to improve full-duplex communication capabilities in next-generation network hardware.$Commercial implications: Enables new full-duplex communication products with enhanced spatial interference management for telecom providers.
Authors
Xuan Li, Xianfu Lei, Mingjiang Wu, Sotiris A. Tegos, Panagiotis D. Diamantoulakis, George K. Karagiannidis
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.