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SCNR Maximization for MIMO ISAC Assisted by Fluid Antenna System

Ye, Y; You, L; Xu, H; Elzanaty, A; Wong, KK; Gao, X; (2025) SCNR Maximization for MIMO ISAC Assisted by Fluid Antenna System. IEEE Transactions on Vehicular Technology 10.1109/TVT.2025.3557859. (In press). Green open access

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Abstract

The integrated sensing and communication (ISAC) technology has been extensively researched to enhance communication rates and radar sensing capabilities. Additionally, a new technology known as fluid antenna system (FAS) has recently been proposed to obtain higher communication rates for future wireless networks by dynamically altering the antenna position to obtain a more favorable channel condition. The application of the FAS technology in ISAC scenarios holds significant research potential. In this paper, we investigate a FAS-assisted multiple-input multiple output (MIMO) ISAC system for maximizing the radar sensing signal-clutter-noise ratio (SCNR) under communication signal-to-interference-plus-noise ratio (SINR) and antenna position constraints. We devise an iterative algorithm that tackles the optimization problem by maximizing a lower bound of SCNR with respect to the transmit precoding matrix and the antenna position. By addressing the non-convexity of the problem through this iterative approach, our method significantly improves the SCNR. Our simulation results demonstrate that the proposed scheme achieves a higher SCNR compared to the baselines.

Type: Article
Title: SCNR Maximization for MIMO ISAC Assisted by Fluid Antenna System
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TVT.2025.3557859
Publisher version: https://doi.org/10.1109/TVT.2025.3557859
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Fluid antenna system, MIMO, integrated sensing and communication, antenna position optimization.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10207800
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