标题： 稳健波束成形设计用于安全的近场ISAC系统 显示英文标题

标题： Robust Beamforming Design for Secure Near-Field ISAC Systems

摘要： 本文研究了具有多个通信用户（CUs）和目标以及多个窃听者的近场安全集成感知与通信（ISAC）系统的鲁棒波束成形设计。考虑到信道不确定性约束，我们最大化目标的最小感知波束图增益，同时满足每个CU的最小信干噪比（SINR）约束、每个窃听者的最大SINR约束以及ISAC发射功率约束。所制定的设计问题是非凸的。作为一种低复杂度次优解决方案，我们首先应用S-Procedure将半无限信道不确定性约束转换为线性矩阵不等式（LMIs），然后使用最先进的顺序秩一约束松弛（SROCR）方法来处理秩一约束。数值结果表明，所提出的ISAC波束成形设计方案优于现有的半定松弛（SDR）和其他基准方案，并显著增强了近场ISAC系统的安全性和鲁棒性。 显示英文摘要

摘要： This letter investigates the robust beamforming design for a near-field secure integrated sensing and communication (ISAC) system with multiple communication users (CUs) and targets, as well as multiple eavesdroppers. Taking into account the channel uncertainty constraints, we maximize the minimum sensing beampattern gain for targets, subject to the minimum signal-to-interference-plus-noise ratio (SINR) constraint for each CU and the maximum SINR constraint for each eavesdropper, as well as the ISAC transmit power constraint. The formulated design problem is non-convex. As a low-complexity suboptimal solution, we first apply the S-Procedure to convert semi-infinite channel uncertainty constraints into linear matrix inequalities (LMIs) and then use the state-of-the-art sequential rank-one constraint relaxation (SROCR) method to address the rank-one constraints. The numerical results show that the proposed ISAC beamforming design scheme outperforms the existing semidefinite relaxation (SDR) and other baseline schemes, and it significantly enhances security and robustness for near-field ISAC systems.