AI 中文总结
针对6G中集成感知与通信的感知隐私保护问题，提出基于发射天线选择与排列的传输策略，使合法接收端可准确估计发射端离开角，非法接收端则无法准确估计。
AI 中文摘要
集成感知与通信（ISAC）被确定为第六代（6G）网络的主要应用场景之一。尽管信息隐私保护技术（如密码学）已得到广泛研究，但感知隐私的保护仍是文献中未解决的问题，本文对此开展了早期探索。具体而言，我们考虑一个由多天线发射端（称为Alice）、单天线合法接收端（称为Bob）和单天线非法接收端（称为Eve）组成的定位系统。为使Bob能估计Alice的离开角（AOD），同时防止Eve基于Alice的信号完成该任务，本文为Alice提出了一种新颖的基于天线选择与排列的传输策略。在该方案下，Alice精心选择部分天线并对其索引进行排列，以建立特定的导频-天线映射用于传输。与信息隐私的密码学类似，该映射将作为保护定位隐私的密钥。在Bob和Eve无噪声的特殊情况下，我们成功找出所有天线选择与排列方案，使得拥有该密钥（确切导频-天线映射知识）的Bob能唯一估计Alice的AOD，而无该密钥的Eve则能估计出多个可对应其接收信号的Alice的AOD。在有噪声的情况下，数值结果表明，我们的方案可迷惑Eve，使其做出不准确的AOD估计。
英文摘要
Integrated sensing and communication (ISAC) has been identified as one primary usage scenario in the sixth-generation (6G) network. While techniques to preserve information privacy, such as cryptography, have been widely investigated, how to preserve sensing privacy is still an open problem in the literature. This paper makes an early attempt to tackle the above issue. Specifically, we consider a localization system consisting of a multi-antenna transmitter, termed Alice, a single-antenna legitimate receiver, termed Bob, and a single-antenna illegitimate receiver, termed Eve. To allow Bob to estimate Alice's angle-of-departure (AOD) but prevent Eve from performing this task based on Alice's signals, this paper proposes a novel antenna selection and permutation based transmission strategy for Alice. Under this scheme, Alice carefully selects a subset of antennas and permutes their indices to establish a specific pilot-antenna mapping for transmission. Similar to cryptography for information privacy, such a mapping will serve as the secret key to preserve localization privacy. In the special case without noise at Bob and Eve, we manage to find out all the antenna selection and permutation solutions such that with this key (knowledge about the exact pilot-antenna mapping), Bob can uniquely estimate Alice's AOD, while without this key, Eve can estimate multiple AODs of Alice that can lead to its received signals. In the noisy case, numerical results are provided to show that our scheme can confuse Eve to make inaccurate AOD estimation as well.
