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JMB: scaling wireless capacity with user demands

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Abstract

We present JMB, a joint multiuser beamforming system, that enables independent access points (APs) to beamform their signals and communicate with their clients on the same channel as if they were one large MIMO transmitter. The key enabling technology behind JMB is a new low-overhead technique for synchronizing the phase of multiple transmitters in a distributed manner. The design allows a wireless LAN to scale its throughput by continually adding more APs on the same channel. JMB is implemented and tested with both software radio clients and off-the-shelf 802.11n cards, and evaluated in a dense congested deployment resembling a conference room. Results from a 10-AP software-radio testbed show a linear increase in network throughput with a median gain of 8.1--9.4×. Our results also demonstrate that JMB's joint multiuser beamforming can provide throughput gains with unmodified 802.11n cards.

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    • Published in

      cover image Communications of the ACM
      Communications of the ACM  Volume 57, Issue 7
      July 2014
      98 pages
      ISSN:0001-0782
      EISSN:1557-7317
      DOI:10.1145/2622628
      • Editor:
      • Moshe Y. Vardi
      Issue’s Table of Contents

      Copyright © 2014 ACM

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      Publication History

      • Published: 1 July 2014

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