Beamforming Feedback-based Model-driven Angle of Departure Estimation Toward Firmware-Agnostic WiFi Sensing

Beamforming Feedback-based Model-driven Angle of Departure Estimation Toward Firmware-Agnostic WiFi Sensing
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基于波束成形反馈的模型驱动的出发角估计,实现与固件无关的 WiFi 传感

DOI:
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发表时间:
2021
期刊:
ArXiv
影响因子:
--
通讯作者:
Koji Yamamoto
Koji Yamamoto
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文献类型:
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作者:
Sohei Itahara;T. Nishio;Koji Yamamoto

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- 本文证明了使用多信号分类(MUSIC)仅具有IEEE 802.11ac/ax中定义的用于波束成形反馈(BFF)的WiFi控制帧的出发角(AoD)估计是可能的。虽然信道状态信息(CSI)使得能够进行模型驱动的AoD估计,但是大多数基于BFF的感测技术是数据驱动的,因为它们仅包含CSI的右奇异向量和子载波平均流增益。具体来说,我们发现子载波平均流增益为零的右奇异向量与基于CSI的MUSIC算法中的噪声子空间向量具有相同的作用。数值计算证实,建议的BFF为基础的MUSIC成功地估计所有传播路径的AoD和增益。同时,这一结果意味着潜在的隐私风险;恶意嗅探器只能使用未加密的BFF帧进行AoD估计。
—This paper proves that the angle of departure (AoD) estimation using the multiple signal classification (MUSIC) with only WiFi control frames for beamforming feedback (BFF), defined in IEEE 802.11ac/ax, is possible. Although channel state information (CSI) enables model-driven AoD estimation, most BFF-based sensing techniques are data-driven because they only contain the right singular vectors of CSI and subcarrier-averaged stream gain. Specifically, we find that right singular vectors with a subcarrier-averaged stream gain of zero have the same role as the noise subspace vectors in the CSI-based MUSIC algorithm. Numerical evaluations confirm that the proposed BFF-based MUSIC successfully estimates the AoDs and gains for all propagation paths. Meanwhile, this result implies a potential privacy risk; a malicious sniffer can carry out AoD estimation only with unencrypted BFF frames.
WiFi/WiMAX融合网络中基于呼损概率预测的动态频率分配方法
DOI: --
发表时间: 2010
期刊:
影响因子: --
作者:
金森悠一;河野圭太;木下和彦;村上孝三
通讯作者: 村上孝三