LiveTag: Sensing Human-Object Interaction through Passive Chipless WiFi Tags
summary
LiveTag is a printed, fully passive metal tag (no battery or silicon) that encodes touchable points as resonators which create frequency notches in ambient Wi‑Fi; touching a resonator detunes its notch and the receiver detects that change after multi‑antenna beamforming and nulling. Prototypes place up to nine touch points (36 resonators), achieve >95% tag and touch detection with a 4‑antenna AP and single‑antenna phone, and demonstrate a bottle water‑level sensor; practical limits: transmitter→tag ≈ 4–5 m, tag→receiver ≈ 0.5 m.
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chapters (18)
- 0:00Intro
- 0:26Sensing Human-Object Interaction
- 1:50Design Goals
- 3:08A Smart Home Enabled by Live Tag
- 5:19Creating WiFi Detectable Features
- 6:32Enabling Multiple Touch Points
- 7:43Optimizing Tag Structure in Live Tag
- 9:17Extracting Tag Signature with WiFi Devices
- 10:00Suppressing Multipath Fading
- 12:06Self-Interference Cancelation
- 13:16Robust Touch Detection
- 14:14Implementation
- 14:37Key Evaluation Results
- 15:22Control Panel for Smart Home
- 15:51Water Level Detector
- 16:47Summary
- 17:22Questions?
- 18:47THE ADVANCED COMPUTING SYSTEMS ASSOCIATION
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