On the Feasibility of Millimeter-wave Backscatter using Commodity 802.11ad 60 GHz Radios
On the Feasibility of Millimeter-wave Backscatter using Commodity 802.11ad 60 GHz Radios
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DOI：
10.1145/3411276.3412189
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
Yoon Chae;K. Bae;Parth H. Pathak;S. Kim
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文献类型：
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作者：
Yoon Chae;K. Bae;Parth H. Pathak;S. Kim
反向散射 RFID 已成为物联网 (IoT) 时代低功耗无线网络和传感的多功能平台。与此同时，毫米波 (mmWave) 无线技术凭借高速 WLAN 和 5G 蜂窝网络获得了巨大的吸引力。尽管大多数 RFID 反向散射研究都集中在较低频率，但毫米波反向散射由于其方向性和宽带宽而提供了独特的机会。现有的毫米波反向散射系统依赖于昂贵的、定制设计的专用读取器，这限制了它们的广泛使用。在这项工作中，我们展示了首个使用 60 GHz 商用现成 (COTS) 802.11ad 无线电的毫米波反向散射系统的经验特性。我们提出的系统仅依赖于通道状态信息（CSI），不需要对硬件或协议进行修改。通过实验，我们证明可以在不同角度和位置在最远 6m 的距离处检测到毫米波反向散射。我们还介绍了如何利用反向散射来估计 WLAN 中的阻塞，从而减少波束搜索开销。我们的工作开辟了一个新的研究方向，毫米波反向散射可用于实现集成的毫米波网络、传感和应用。
Backscattering RFIDs have emerged as a versatile platform for low-power wireless networking and sensing in the era of Internet-of-Things (IoT). At the same time, millimeter-wave (mmWave) wireless has gained substantial attraction with high-speed WLAN and 5G cellular networks. Although the majority of RFID backscatter research focuses on lower frequencies, mmWave backscatter provides unique opportunities due to its directionality and wide bandwidth. Existing mmWave backscatter systems rely on expensive, custom-designed, dedicated readers which limit their widespread use. In this work, we present an empirical characterization of the first-of-its-kind mmWave backscatter system using 60 GHz commercial off-the-shelf (COTS) 802.11ad radios. Our presented system only relies on Channel State Information (CSI) and requires no modification to hardware or protocol. Through experimentation, we demonstrate that mmWave backscatter can be detected at a distance of up to 6m at different angles and locations. We also present how the backscatter can be leveraged in estimating the blockages in a WLAN which can reduce the beamsearching overhead. Our work opens a new direction of research where mmWave backscatter can be used to realize an integrated mmWave networking, sensing, and applications.