We Can Hear You with Wi-Fi!
We Can Hear You with Wi-Fi!
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DOI：
10.1145/2639108.2639112
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发表时间：
2014-09
影响因子：
7.9
通讯作者：
Guan-Ru Wang;Yongpan Zou;Zimu Zhou;Kaishun Wu;L. Ni
中科院分区：
文献类型：
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作者：
Guan-Ru Wang;Yongpan Zou;Zimu Zhou;Kaishun Wu;L. Ni
最近的文献表明，Wi-Fi信号可以“看到”人们的动作和位置。本文提出了以下问题：Wi-Fi能“听到”我们的谈话吗？我们推出了WiHear，它使Wi-Fi信号能够在不部署任何设备的情况下“听到”我们的谈话。为了实现这一点，WiHear需要检测和分析来自嘴部运动的细粒度无线电反射。WiHear通过引入利用部分多路径效应和小波包变换的嘴部运动轮廓来解决这一微运动检测问题。由于Wi-Fi信号不需要视线，WiHear可以在无线电覆盖范围内“听到”人们的谈话。此外，WiHear还可以利用MIMO技术同时“听到”多人的谈话。我们在USRP N210平台和商业Wi-Fi基础设施上实施WiHear。结果表明，在我们的预定义词汇表中，WiHear对于单个人说话不超过6个单词的平均检测准确率为91%，对于不超过3个人同时说话的检测准确率高达74%。此外，通过从不同角度部署多个接收器，可以进一步提高检测精度。
Recent literature advances Wi-Fi signals to “see” people's motions and locations. This paper asks the following question: Can Wi-Fi “hear” our talks? We present WiHear, which enables Wi-Fi signals to “hear” our talks without deploying any devices. To achieve this, WiHear needs to detect and analyze fine-grained radio reflections from mouth movements. WiHear solves this micro-movement detection problem by introducing Mouth Motion Profile that leverages partial multipath effects and wavelet packet transformation. Since Wi-Fi signals do not require line-of-sight, WiHear can “hear” people talks within the radio range. Further, WiHear can simultaneously “hear” multiple people's talks leveraging MIMO technology. We implement WiHear on both USRP N210 platform and commercial Wi-Fi infrastructure. Results show that within our pre-defined vocabulary, WiHear can achieve detection accuracy of 91 percent on average for single individual speaking no more than six words and up to 74 percent for no more than three people talking simultaneously. Moreover, the detection accuracy can be further improved by deploying multiple receivers from different angles.