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Creators/Authors contains: "Hessar, M"

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  1. ; (, Proceedings of the 16th USENIX Symposium on Networked Systems Design and Implementation (NSDI ’19))
    We present the first wireless protocol that scales to hundreds of concurrent transmissions from backscatter devices. Our key innovation is a distributed cod- ing mechanism that works below the noise floor, operates on backscatter devices and can decode all the concurrent transmissions at the receiver using a single FFT operation. Our design addresses practical issues such as timing and fre- quency synchronization as well as the near-far problem. We deploy our design using a testbed of backscatter hardware and show that our protocol scales to concurrent transmis- sions from 256 devices using a bandwidth of only 500 kHz. Our results show throughput and latency improvements of 14–62x and 15–67x over existing approaches and 1–2 orders of magnitude higher transmission concurrency. 
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    Accepted Manuscript Full Text Available