TY - JOUR N1 - This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. KW - Fluid antenna system KW - ISAC KW - port selection AV - public TI - Shifting the ISAC Trade-Off With Fluid Antenna Systems SN - 2162-2337 EP - 3483 IS - 12 SP - 3479 VL - 13 JF - IEEE Wireless Communications Letters A1 - Zou, Jiaqi A1 - Xu, Hao A1 - Wang, Chao A1 - Xu, Lvxin A1 - Sun, Songlin A1 - Meng, Kaitao A1 - Masouros, Christos A1 - Wong, Kai-Kit PB - Institute of Electrical and Electronics Engineers (IEEE) Y1 - 2024/12// UR - http://dx.doi.org/10.1109/lwc.2024.3473991 ID - discovery10198506 N2 - As an emerging reconfigurable antenna technology, fluid antenna system (FAS) has the capability of improving both sensing and communication (S&C) performance by switching the antenna position over the available ports. This increased spatial degree-of-freedom (DoF) by FAS can be translated into enlarging the trade-off region for integrated sensing and communication (ISAC). In this letter, we propose a signal model for FAS-enabled ISAC and jointly optimize the transmit beamforming and port selection of FAS. In particular, our objective is to minimize the transmit power, while satisfying both communication and sensing requirements. To tackle this, an efficient iterative algorithm based on sparse optimization, convex approximation, and a penalty approach is developed. Our simulation results illustrate that the proposed scheme can attain 33% reductions in the transmit power with guaranteed S&C performance, showing the great potential of FAS for striking a balance between S&C in ISAC systems. ER -