Pushing the Range Limits of Commercial Passive RFIDs
summary
PushID claims it extends commercial passive RFID range without changing tags by coordinating off-the-shelf readers to do coherent distributed beamforming. It models a space as a grid, turns beamformer selection into a set-cover heuristic, and prunes candidates with a gradient-based generator. Prototype uses USRPs and eight distributed readers, reaches 64 meters to the closest reader (≈7.4× improvement), uses ~980 beamformers to discover 95% in 4.4 seconds, and relies on distributed MIMO with spanning-tree sync.
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chapters (7)
- 0:00Start
- 9:22PushiD models the received signal power at each point in space for each beamformning vectors.
- 9:57Energy Overlapping
- 11:33Modified set cover problem
- 15:29Range vs. Number of Readers
- 16:16Impact of Tag Orientation
- 17:45PushiD - Conclusion
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