This work considers the problem of mitigating information leakage between communication and sensing in systems jointly performing both operations. Specifically, a discrete memoryless state-dependent broadcast channel model is studied in which (i) the presence of feedback enables a transmitter to convey information, while simultaneously performing channel state estimation; (ii) one of the receivers is treated as an eavesdropper whose state should be estimated but which should remain oblivious to part of the transmitted information. The model abstracts the challenges behind security for joint communication and sensing if one views the channel state as a key attribute, e.g., location. For independent and identically distributed states, perfect output feedback, and when part of the transmitted message should be kept secret, a partial characterization of the secrecy-distortion region is developed. The characterization is exact when the broadcast channel is either physically-degraded or reversely-physically-degraded. The partial characterization is also extended to the situation in which the entire transmitted message should be kept secret. The benefits of a joint approach compared to separation-based secure communication and state-sensing methods are illustrated with binary joint communication and sensing models.
翻译:该研究考虑了在同时执行通信和感测操作的系统中减轻通信和感测之间信息泄漏的问题。具体而言,研究了一个离散无记忆状态相关广播通道模型,其中(i)反馈的存在使得发射机能够传递信息,同时执行信道状态估计;(ii)其中一个接收机被视为一个窃听者,他的状态应该被估计,但他应该保持对部分传输信息的无知。如果将通道状态视为关键属性(例如位置),那么该模型抽象了联合通信和感测安全背后的挑战。对于独立且等级分布状态、完美输出反馈并且当部分传输信息需要保密时,开发了保密失真区域的部分表征。当广播通道为物理级别递减或反向物理级别递减时,表征是精确的。也将部分表征扩展到整个传输信息需要保密的情况。与基于分离的安全通信和状态感测方法相比,联合方法的优点通过二进制联合通信和感测模型加以说明。