We consider a secure integrated sensing and communication (ISAC) scenario, in which a signal is transmitted through a state-dependent wiretap channel with one legitimate receiver with which the transmitter communicates and one honest-but-curious target that the transmitter wants to sense. The secure ISAC channel is modeled as two state-dependent fast-fading channels with correlated Rayleigh fading coefficients and independent additive Gaussian noise components. Delayed channel outputs are fed back to the transmitter to improve the communication performance and to estimate the channel state sequence. We establish and illustrate an achievable secrecy-distortion region for degraded secure ISAC channels under correlated Rayleigh fading. We also evaluate the inner bound for a large set of parameters to derive practical design insights for secure ISAC methods. The presented results include in particular parameter ranges for which the secrecy capacity of a classical wiretap channel setup is surpassed and for which the channel capacity is approached.

翻译：本文研究一种安全集成感知与通信（ISAC）场景，其中信号通过状态相关的窃听信道传输：存在一个合法接收器（发射机与其进行通信）和一个诚实但好奇的目标（发射机需对其进行感知）。安全ISAC信道被建模为两个状态相关的快衰落信道，其瑞利衰落系数具有相关性，且加性高斯噪声分量相互独立。系统将延迟信道输出反馈至发射机，以提升通信性能并估计信道状态序列。针对相关瑞利衰落下的退化安全ISAC信道，我们建立并阐释了可达的保密-失真区域。此外，通过对大范围参数集进行内界评估，为安全ISAC方法提供了实用的设计指导。所得结果特别揭示了以下参数范围：既超越了经典窃听信道设置的保密容量，又逼近了信道容量极限。