RFID+: Spatially Controllable Identification of UHF RFIDs via Controlled Magnetic Fields
Talkat 21st USENIX Symposium on Networked Systems Design and Implementation (NSDI '24) · 2024-04-16..04-18·
summary
RFID+ builds a magnetically driven UHF RFID system that powers off-the-shelf tags via their matching loops using a capacitor-segmented multi-turn coil and a 2×2 coil array, steers near-field energy with an HIS reflector and phase-shift beamforming, and runs a dual-covering inventory with a Bloom filter to cut communication overhead ~60%. Implementation uses a USRP X310, Raspberry Pi phase shifters and coil transmitters; pilots report miss-reading falling from 22.9% to 1.06%, cross-reading nearly eliminated, and inventories in ~2.4 s.
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chapters (9)
- 0:00RFID+ introduction and apps
- 1:01UHF RFID challenges
- 3:12Magnetic fields for RFID control
- 5:41RFID+ proposal and core tech
- 6:04Uniform magnetic fields at UHF
- 8:50Precise magnetic field control
- 11:21Faster inventory with dual coverage
- 13:04RFID+ implementation and eval
- 15:33Conclusion and future
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