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在压缩的IEEE 802.11 CSI反馈中保护人类活动签名

Protecting Human Activity Signatures in Compressed IEEE 802.11 CSI Feedback

Princeton University(普林斯顿大学);MediaTek(联发科);Stony Brook University(石溪大学)

Mohamed Seif, Atsutse Kludze, Yasaman Ghasempour, H. Vincent Poor, Doru Calin, Andrea J. Goldsmith

AI总结:

本文提出一种兼容标准的差分隐私量化机制,通过在发射波束成形矩阵的Givens参数上应用ε-DP随机量化器,保护CSI反馈中的用户活动签名,同时保持802.11反馈结构和波束成形性能。

摘要:

在IEEE 802.11中,显式信道状态信息(CSI)反馈通过报告量化后的Givens旋转和相位角来传达发射波束成形方向,这些角度编码了传播环境的细粒度空间特征。最近的研究表明,明文CSI反馈可能无意中向被动窃听者泄露用户活动、身份和位置信息。本文引入了一种兼容标准的差分隐私(DP)量化机制,通过将确定性角度量化替换为直接应用于发射波束成形矩阵Givens参数的ε-DP随机量化器。该机制保持了802.11反馈结构,允许对角度表示的闭合形式灵敏度界,并实现了原理上的隐私校准。数值模拟显示,该机制在隐私保障方面表现优异,同时对波束成形性能的降级极小。

英文摘要:

Explicit channel state information (CSI) feedback in IEEE~802.11 conveys \emph{transmit beamforming directions} by reporting quantized Givens rotation and phase angles that parametrize the right-singular subspace of the channel matrix. Because these angles encode fine-grained spatial signatures of the propagation environment, recent work have shown that plaintext CSI feedback can inadvertently reveal user activity, identity, and location to passive eavesdroppers. In this work, we introduce a standards-compatible \emph{differentially private (DP) quantization mechanism} that replaces deterministic angular quantization with an $\varepsilon$-DP stochastic quantizer applied directly to the Givens parameters of the transmit beamforming matrix. The mechanism preserves the 802.11 feedback structure, admits closed-form sensitivity bounds for the angular representation, and enables principled privacy calibration. Numerical simulations demonstrate strong privacy guarantees with minimal degradation in beamforming performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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