mmComb: High-speed mmWave Commodity WiFi Backscatter
Talkat 21st USENIX Symposium on Networked Systems Design and Implementation (NSDI '24) · 2024-04-16..04-18·
summary
mmComb turns 802.11ad/ay beamforming control frames into a backscatter carrier by flipping DBPSK phase to encode tag bits and uses receive beamforming plus a decorrelation smoothing step to suppress strong self interference and isolate weak reflections identified via power delay profiles. A hardware prototype with a tag and 60 GHz commodity WiFi devices delivers 55 Mbps with 87.3 μW power and BER under 10^−3 out to roughly 5.5 m, and supports concurrent tags.
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chapters (9)
- 0:00mmComb project
- 2:01Motivation for mmWave backscatter
- 4:11Backscatter bits in Wi-Fi frames
- 6:41System integration challenges
- 8:29Self-interference with beamforming
- 11:47Backscatter in Wi-Fi networks
- 13:37Tag design and Wi-Fi
- 14:43Experimental results
- 16:10Summary and future
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