Zhuqi Li
Kyle Jamieson
Abstract
Conventional wireless network designs to date target endpoint designs that view the channel as a given. Examples include rate and power control at the transmitter, sophisticated receiver decoder designs, and high-performance forward error correction for the data itself. We instead explore whether it is possible to reconfigure the environment itself to facilitate wireless communication. In this work, we instrument the environment with a large array of inexpensive antenna (LAIA) elements, and design algorithms to configure LAIA elements in real time. Our system achieves a high level of programmability through rapid adjustments of an on-board phase shifter in each LAIA element. We design a channel decomposition algorithm to quickly estimate the wireless channel due to the environment alone, which leads us to a process to align the phases of the LAIA elements. We implement and deploy a 36-element LAIA array in a real indoor home environment. Experiments in this setting show that, by reconfiguring the wireless environment, we can achieve a 24% TCP throughput improvement on average and a median improvement of 51.4% in Shannon capacity over baseline single-antenna links.
- P. Bah and V Padmanabhan. (2000). V.N. radar: An in-building rf-based user location and tracking system. In IEEE INFOCOM.Google Scholar
- Z. Li, Y Xie, L. Shangguan, R.I. Zelaya, J. Gummeson, W. Hu and K. Jamieson. Towards programming the radio environment with large arrays of inexpensive antennas. (2019). In 16th USENIX Symposium on Networked Systems Design and Implementation, NSDI 19, 285--300.Google Scholar
- A. Miu, H. Balakrishnan, and C.E. Koksal. (2005). Improving loss resilience with multi-radio diversity in wireless networks. In MobiCom.Google Scholar
- W.C. Stone. Electromagnetic signal attenuation in construction materials. Tech. rep., National Institute of Standards and Technology, 1997.Google Scholar
- Warp 802.11 throughput benchmarks. https://warpproject.org/trac/wiki/802.11/ Benchmarks/Throughput.Google Scholar
- Rice Univ. WARP platform (v. 3). https:// mangocomm.com/products/kits/warp-v3-kit.Google Scholar
- R. Wilson. Propagation losses through common building materials 2.4 ghz vs 5 ghz. (2002). Magis Networks Inc.: San Diego, CA, USA (2002).Google Scholar
Index Terms
- Programmable Radio Environments with Large Arrays of Inexpensive Antennas
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Towards programming the radio environment with large arrays of inexpensive antennas
NSDI'19: Proceedings of the 16th USENIX Conference on Networked Systems Design and ImplementationConventional thinking treats the wireless channel as a constraint, so wireless network designs to date target endpoint designs that best utilize the channel. Examples include rate and power control at the transmitter, sophisticated receiver decoder ...
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