OmniScatter: extreme sensitivity mmWave backscattering using commodity FMCW radar
OmniScatter: extreme sensitivity mmWave backscattering using commodity FMCW radar
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DOI：
10.1145/3498361.3538924
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
K. Bae;Natalie Ahn;Yoon Chae;Parth H. Pathak;Sung-Min Sohn;S. Kim
中科院分区：
文献类型：
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作者：
K. Bae;Natalie Ahn;Yoon Chae;Parth H. Pathak;Sung-Min Sohn;S. Kim
海量连接是物联网成功的关键。尽管毫米波后向散射具有巨大的潜力，但巨大的信号衰减和势不可挡的环境反射带来了巨大的挑战。我们介绍了一种实用的毫米波后向散射材料OmniScatter，其极端灵敏度为-115 dBm。该性能在理论上可与流行的商品RFID EPC Gen2(900 MHz)相媲美，并通过在具有大量环境反射和阻塞的各种实际环境下的评估得到经验验证-例如，在标签被锁在6米外的木质壁橱中的办公室，以及在图书馆和零售店中，标签被放置在两排金属货架上。OmniScatter的核心是新的高清晰度FMCW(HD-FMCW)，它与标签(FSK)信号相互作用，在频域将环境反射从标签信号中分离出来，本质上提供了对环境反射的免疫力。为了进一步支持实际部署，OmniScatter提供无需协调的频分多址(FDMA)，可以轻松扩展到数千个并发标签。阅读器建立在商用雷达上，标签是在印刷电路板上制作的原型。跟踪驱动的评估展示了1100个标签与误码率1.5%的并发通信，为日常和任何地方使用的实用毫米波后向散射铺平了道路。
Massive connectivity is a key to the success of the Internet of Things. While mmWave backscatter has great potential, substantial signal attenuation and overwhelming ambient reflections impose significant challenges. We present OmniScatter, a practical mmWave backscatter with an extreme sensitivity of -115 dBm. The performance is theoretically comparable to the popular commodity RFID EPC Gen2 (900 MHz), and is empirically validated via evaluations under various practical settings with abundant ambient reflections and blockages - e.g., In an office where a tag is locked in a wooden closet 6m away, as well in libraries and retail stores where a tag is placed across two rows of metal shelves. At the heart of OmniScatter is the new High Definition FMCW (HD-FMCW), which interplays with the tag (FSK) signal to disentangle the ambient reflections from the tag signal in the frequency domain, essentially offering immunity to ambient reflections. To further support practical deployment, OmniScatter offers coordination-free Frequency Division Multiple Access (FDMA) that effortlessly scales to thousands of concurrent tags. The readers were built on commodity radars and the tags were prototyped on PCB. The trace-driven evaluation demonstrates concurrent communication of 1100 tags with the BER < 1.5%, paving a pathway towards practical mmWave backscatter for everyday and anywhere use.