mReader: Concurrent UHF RFID Tag Reading
mReader: Concurrent UHF RFID Tag Reading
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DOI：
10.1145/3565287.3610256
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发表时间：
2023-10
期刊：
影响因子：
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通讯作者：
Hossein Pirayesh;Shichen Zhang;Huacheng Zeng
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文献类型：
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作者：
Hossein Pirayesh;Shichen Zhang;Huacheng Zeng
UHF RFID标签已被广泛用于非接触式库存和跟踪应用程序。 RFID读者的一个基本问题是他们的标签阅读率有限。现有的RFID读取器（例如，Impinj Speedway）可以在读取区域中读取大约35个标签，这对于许多应用程序远远不够。在本文中，我们介绍了第一本RFID读取器（Mreader），该读取器（Mreader）借用了从蜂窝网络的多用户MIMO（MU-MIMO）的想法，以启用被动RFID系统中的并发多标签阅读。 Mreader配备了多个天线，用于在下行链路传输中进行隐式光束形成。它可以通过三种关键技术启用：上行链路碰撞恢复，基于过渡的通道估计和零离线通道校准。此外，Mreader还采用Q值适应算法进行中等访问控制，以最大化其标签阅读率。我们已经在USRP X310上构建了Mreader的原型，并首次证明了两种读者可以同时读取两个商业现成（COTS）标签。数值结果进一步表明，与现有的RFID读取器相比，Mreader可以将标签阅读率提高45％。
UHF RFID tags have been widely used for contactless inventory and tracking applications. One fundamental problem with RFID readers is their limited tag reading rate. Existing RFID readers (e.g., Impinj Speedway) can read about 35 tags per second in a read zone, which is far from enough for many applications. In this paper, we present the first-of-its-kind RFID reader (mReader), which borrows the idea of multi-user MIMO (MU-MIMO) from cellular networks to enable concurrent multi-tag reading in passive RFID systems. mReader is equipped with multiple antennas for implicit beamforming in downlink transmissions. It is enabled by three key techniques: uplink collision recovery, transition-based channel estimation, and zero-overhead channel calibration. In addition, mReader employs a Q-value adaptation algorithm for medium access control to maximize its tag reading rate. We have built a prototype of mReader on USRP X310 and demonstrated for the first time that a two-antenna reader can read two commercial off-the-shelf (COTS) tags simultaneously. Numerical results further show that mReader can improve the tag reading rate by 45% compared to existing RFID readers.