AI 中文总结
该研究针对含相位噪声的ISAC系统，分析合法收发信机、窃听者与通信用户间的权衡关系，利用LO不对称性扩大感知隐私差距，仅造成数据速率适度下降。
AI 中文摘要
我们研究了由本地振荡器（LO）缺陷产生的相位噪声（PN）影响下的正交频分复用（OFDM）集成感知与通信（ISAC）系统中的感知隐私。具体而言，我们考虑一个ISAC场景，其中包含一个合法的单基地ISAC收发信机（Alice）、一个执行未授权双基地感知的窃听者（Eve）和一个通信用户（UE），三者均配备非理想LO。为表征存在PN时的感知性能，我们对Alice和Eve的单基地及双基地距离估计进行了误设定克拉美罗下界（MCRB）分析，由于分别使用共享LO和独立LO，二者的差分PN过程分别呈现自相关（依赖延迟）和互相关（不依赖延迟）特性。仿真结果显示，在PN作用下，合法单基地感知、未授权双基地感知与UE通信三者之间存在权衡关系，该关系由Alice的LO质量决定。通过Alice与Eve之间的LO不对称性，Alice处LO质量恶化可显著扩大有利于她的感知隐私差距，尤其针对近距离目标，且在噪声受限区域仅会导致数据速率适度下降。
英文摘要
We investigate sensing privacy in orthogonal frequency-division multiplexing (OFDM) integrated sensing and communication (ISAC) systems under the impact of phase noise (PN) arising from local oscillator (LO) imperfections. Specifically, we consider an ISAC scenario comprising a legitimate monostatic ISAC transceiver (Alice), an eavesdropper performing unauthorized bistatic sensing (Eve) and a communication user (UE), each equipped with a non-ideal LO. To characterize sensing performance in the presence of PN, we carry out a misspecified Cramér-Rao bound (MCRB) analysis of monostatic and bistatic range estimation at Alice and Eve, whose differential PN processes are self-correlated (delay-dependent) and cross-correlated (delay-independent) due to the use of a shared and an independent LO, respectively. Simulation results reveal three-way trade-offs among legitimate monostatic sensing at Alice, unauthorized bistatic sensing at Eve and communication to the UE under PN, governed by the LO quality at Alice. Through the LO asymmetry between Alice and Eve, worsening LO quality at Alice can significantly enlarge sensing privacy gap in her favor, especially for nearby targets, with only a moderate reduction in data rate in noise-limited regimes.
