NetScatter: Enabling Large-Scale Backscatter Networks
summary
First protocol that decodes hundreds of simultaneous backscatter radios by assigning distributed chirp/cyclic-shift coding so each device maps to an FFT bin and the receiver uses a single FFT decode to demodulate everyone below the noise floor. Practical fixes: avoid timing jitter by spacing cyclic shifts (trading 512 theoretical bins down to ~56 usable slots), solve near–far by clustering similar RSS and switching between three impedances (0, −4, −10 dB). Built a 256-node testbed with a USRP access point and discrete backscatter devices and shows 14–62× throughput and 15–67× latency improvements using 500 kHz.
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chapters (16)
- 0:00Intro
- 0:22Backscatter Communication
- 1:08Grand Challenge: Long Range Backscatter Network
- 2:11Outline
- 3:42Drawbacks of Chirp Spread Spectrum
- 4:26Our Key Observation
- 6:01Network of Hundred Backscatter Devices
- 7:37Practical Issues: Timing Synchronization
- 8:52Timing Synchronization Solution
- 9:28Practical Issues: Near-Far Problem
- 10:41Solution: Power Adaptation Algorithm
- 11:54Implementation
- 12:17Evaluation: Large-Scale Deployment
- 12:56Evaluation: Network PHY Data-Rate
- 14:35Evaluation: Network latency
- 14:57NetScatter
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