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Pushing the Physical Limits of IoT Devices with Programmable Metasurfaces

on YouTube 13m
Talkat NSDI ’21 · 2021-04-12..04-14· [embedded-and-hardware]

speakers

name:Lili Chen
links:none on file
name:Wenjun Hu
links:none on file
name:Kyle Jamieson
links:none on file
name:Xiaojiang Chen
links:none on file
name:Dingyi Fang
links:none on file
name:Jeremy Gummeson
links:none on file

resources

video:https://youtu.be/hlz-skAuR6U
slides:none on file

summary

LLAMA builds a programmable metasurface for the 2.4 GHz ISM band that rotates polarization to fix mismatch between cheap single-antenna IoT devices. A 48×48 cm prototype with varactor-controlled elements and PC-controlled DC supplies sweeps polarization angles in ~4 s and yields up to 15 dB link-power gains and measured wireless capacity increases of 100 and 180 Kbit/s/Hz in through-surface and reflective setups. Design choices tradeoff cost and loss (FR4 with air gaps) to keep transmission efficiency practical for deployment.

AI-written summary · about

chapters (19)

  1. 0:00Intro
  2. 1:08Physical issue of communication links between low-cost loT devices
  3. 1:29The cause of power loss polarization 'mismatch
  4. 2:02Our work LLAMA — Low-power Lattice of Actuated Metasurface Antennas
  5. 2:23Basic idea of polarization rotator design
  6. 3:35Challenges of designing metasurface in 2.4GHz ISM band
  7. 4:51Our solution to ensure low loss and low cost optimize the structure of polarization rotator
  8. 5:54System architecture of LLAMA
  9. 6:18Synchronization between the receiver and rotator
  10. 6:36Our synchronization method connect the receiver and power supply to controller
  11. 7:17Our approach to reduce time cost coarse-grained to fine-grained voltage sweep
  12. 7:34Implementation -- prototype
  13. 8:04Implementation -- evaluation setups
  14. 8:54signal enhancement
  15. 9:24varying frequency
  16. 10:28operating with larger bandwidth
  17. 11:05Reflective evaluation
  18. 11:24employing LLAMA for breath sensing
  19. 12:09Conclusions

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