μMote: Enabling Passive Chirp De-spreading and μW-level Long-Range Downlink
summary
Passive chirp de-spreading moves chirp generation to the RF transmitter and mixes two transmitted chirps on-device, while a resonant LC accumulates energy and preserves symbol-duration encoding so symbols map to pulse length instead of amplitude. Decoding uses an RC integrator and comparator to avoid ADC sampling. Prototype with COTS parts consumes 62.07µW and achieves 400m range at 2 kbps with 1% BER under −2 dB SINR (receiving sensitivity ≈ −48 dBm); a simplified variant reaches ≈200 m.
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chapters (9)
- 0:00Start
- 0:31Conventional Backscatter Devices
- 0:57CSS-based Long-range Backscatter
- 1:37CSS communication principle
- 2:59Two challenges
- 7:20Challenge 3 How to decode the symbol with low power?
- 12:08Implementation
- 12:44Evaluation
- 16:21Contributions
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