Orthcatter: High-throughput In-band OFDM Backscatter with Over-the-Air Code Division
Talkat 21st USENIX Symposium on Networked Systems Design and Implementation (NSDI '24) · 2024-04-16..04-18·
summary
Orthcatter claims a working prototype that turns a Wi‑Fi OFDM exciter into a carrier for high‑rate in‑band backscatter, reaching 248 kbps and BER ≈ 10^-4 while using the same channel. It creates quasi‑orthogonal codewords by swapping subcarriers and implements a passive double side‑band symbol generator plus a two‑step interference cancellation pipeline. Experiments show 4.6× throughput and 300× BER improvement over prior in‑band designs, 3× tag range, and tag power ≈63 μW.
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chapters (12)
- 0:00Orthcatter project intro
- 1:40OFDM backscatter requirements
- 3:25In-band vs side-band limits
- 5:36Orthcatter design challenges
- 8:51Orthcatter contributions
- 9:56Double side-band symbols
- 11:39Interference cancellation decoding
- 13:49Sliding window sync
- 15:16Implementation details
- 15:58Performance vs state-of-the-art
- 17:24Packet rate signal impact
- 18:29Summary future apps
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