Publication Type

Conference Proceeding Article

Version

publishedVersion

Publication Date

2-2012

Abstract

Location systems are key to a rich experience for mobile users. When they roam outdoors, mobiles can usually count on a clear GPS signal for an accurate location, but indoors, GPS usually fades, and so up until recently, mobiles have had to rely mainly on rather coarse-grained signal strength readings for location. What has changed this status quo is the recent trend of dramatically increasing numbers of antennas at the indoor AP, mainly to bolster capacity and coverage with multiple-input, multiple-output (MIMO) techniques. In the near future, the number of antennas at the access point will increase several-fold, to meet increasing demands for wireless capacity with MIMO links, spatial division multiplexing, and interference management. We thus observe an opportunity to revisit the important problem of localization with a fresh perspective. This paper presents the design and experimental evaluation of ArrayTrack, an indoor location system that uses MIMO-based techniques to track wireless clients in real time as they roam about a building. We prototype ArrayTrack on a WARP platform, emulating the capabilities of an inexpensive 802.11 wireless access point. Our results show that ArrayTrack can pinpoint 33 clients spread out over an indoor office environment to within a 36 cm location accuracy.

Keywords

Wireless, MIMO, AoA, 802.11, Multi-antenna system, ArrayTrack, Indoor Localization

Discipline

Digital Communications and Networking | Software Engineering

Research Areas

Software and Cyber-Physical Systems

Publication

HotMobile '12: Proceedings of the 12th Workshop on Mobile Computing Systems & Applications: February 28-29, 2012, San Diego, CA

First Page

73

Last Page

78

ISBN

9781450312073

Identifier

10.1145/2162081.2162100

Publisher

ACM

City or Country

New York

Additional URL

http://doi.org/10.1145/2162081.2162100

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