Proceedings ArticleDOI
FreeRider: Backscatter Communication Using Commodity Radios
Pengyu Zhang,Colleen Josephson,Dinesh Bharadia,Sachin Katti +3 more
- pp 389-401
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TLDR
The design and implementation of FreeRider is introduced, the first system that enables backscatter communication with multiple commodity radios, such as 802.11g/n WiFi, ZigBee, and Bluetooth, while these radios are simultaneously used for productive data communication.Abstract:
We introduce the design and implementation of FreeRider, the first system that enables backscatter communication with multiple commodity radios, such as 802.11g/n WiFi, ZigBee, and Bluetooth, while these radios are simultaneously used for productive data communication. Furthermore, we are, to our knowledge, the first to implement and evaluate a multi-tag system. The key technique used by FreeRider is codeword translation, where a tag can transform a codeword present in the original excitation signal into another valid codeword from the same codebook during backscattering. In other words, the backscattered signal is still a valid WiFi, ZigBee, or Bluetooth signal. Therefore, commodity radios decode the backscattered signal and extract the tag's embedded information. More importantly, FreeRider does codeword translation regardless of the data transmitted by these radios. Therefore, these radios can still do productive data communication. FreeRider accomplishes codeword translation by modifying one or more of the three dimensions of a wireless signal --- amplitude, phase and frequency. A tag ensures that the modified signal is still comprised of valid codewords that come the same codebook as the original excitation signal. We built a hardware prototype of FreeRider, and our empirical evaluations show a data rate of ~60kbps in single tag mode, 15kbps in multi-tag mode, and a backscatter communication distance up to 42m when operating on 802.11g/n WiFi.read more
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Proceedings ArticleDOI
PLoRa: a passive long-range data network from ambient LoRa transmissions
Yao Peng,Longfei Shangguan,Yue Hu,Qian Yujie,Lin Xianshang,Xiaojiang Chen,Dingyi Fang,Kyle Jamieson +7 more
TL;DR: PLoRa takes ambient LoRa transmissions as the excitation signals, conveys data by modulating an excitation signal into a new standard LoRa "chirp" signal, and shifts this new signal to a different LoRa channel to be received at a gateway faraway.
Journal ArticleDOI
Practical Backscatter Communication Systems for Battery-Free Internet of Things: A Tutorial and Survey of Recent Research
Chenren Xu,Lei Yang,Pengyu Zhang +2 more
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Proceedings ArticleDOI
Spatial Stream Backscatter Using Commodity WiFi
Jia Zhao,Wei Gong,Jiangchuan Liu +2 more
TL;DR: MOXcatter is presented, a WiFi backscatter communication system that works with spatial streams using commodity radios, while keeping the ongoing data communication unaffected, and also showcases the applicability of the design through a sensor communication system.
Proceedings ArticleDOI
OFDMA-Enabled Wi-Fi Backscatter
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Proceedings ArticleDOI
Battery-free Visible Light Sensing
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