In this paper, we consider joint antenna allocation and transmit beamforming design in secure integrated sensing and communication (ISAC) systems. A dual-function base station (DFBS) aims to securely deliver messages to a single-antenna receiver while detecting potential eavesdroppers. To prevent eavesdropping, we incorporate specialized sensing signals, intentionally reducing communication signal power toward suspicious targets to improve sensing. We prioritize minimizing the matching error between the transmitting and required beampatterns for sensing and communication. Our design optimizes antenna allocation and beamforming at the DFBS, meeting minimum secrecy rate and power constraints. We propose solvers based on alternating optimization for the non-convex design problem. Simulations show that the antenna allocation scheme significantly improves safety performance.

翻译：本文研究了安全集成感知与通信系统中联合天线分配与发射波束成形设计问题。双功能基站需在向单天线接收机安全传输信息的同时检测潜在窃听者。为防止窃听，我们引入专用感知信号，通过主动降低通信信号在可疑目标方向的功率来增强感知能力。设计以最小化感知与通信所需波束方向图与发射波束方向图之间的匹配误差为首要目标，在满足最低保密速率与功率约束条件下，对基站的天线分配方案与波束成形进行联合优化。针对这一非凸设计问题，我们提出了基于交替优化的求解算法。仿真结果表明，所提天线分配方案能显著提升系统安全性能。