In this letter, we investigate the fluid antenna (FA)-assisted integrated sensing and communication (ISAC) system, where communication and radar sensing employ the co-waveform design. Specifically, we focus on the beamformer design and antenna position configuration to realize a higher communication rate while guaranteeing the minimum radar probing power. Different from existing beamformer algorithms, we propose an efficient proximal distance algorithm (PDA) to solve the multiuser sum-rate maximization problem with radar sensing constraint to obtain the closed-form beamforming vector. In addition, we develop an extrapolated projected gradient (EPG) algorithm to obtain a better antenna location configuration for FA to enhance the ISAC performance. Numerical results show that the considered FA-assisted ISAC system enjoys a higher sum-rate by the proposed algorithm, compared with that in existing non-FA ISAC systems.

翻译：本文研究了流体天线（FA）辅助的通感一体化（ISAC）系统，其中通信与雷达感知采用共波形设计。具体而言，我们聚焦于波束赋形器设计与天线位置配置，在保证最小雷达探测功率的前提下实现更高通信速率。与现有波束赋形算法不同，我们提出一种高效近端距离算法（PDA）来求解具有雷达感知约束的多用户总速率最大化问题，从而获得闭式波束赋形向量。此外，我们开发了外推投影梯度（EPG）算法，为FA优化天线位置配置以增强ISAC性能。数值结果表明，与现有非FA ISAC系统相比，所提出的算法使FA辅助ISAC系统获得了更高的总速率。