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Sensors 2015, 15(1), 1292-1311;

Received Signal Strength Recovery in Green WLAN Indoor Positioning System Using Singular Value Thresholding

Harbin Institute of Technology, Communication Research Center, 92 West Dazhi Street, Nan Gang District, Harbin 150001, China
Author to whom correspondence should be addressed.
Received: 30 October 2014 / Accepted: 7 January 2015 / Published: 12 January 2015
(This article belongs to the Special Issue Sensors for Indoor Mapping and Navigation)
Full-Text   |   PDF [633 KB, uploaded 13 January 2015]


Green WLAN is a promising technique for accessing future indoor Internet services. It is designed not only for high-speed data communication purposes but also for energy efficiency. The basic strategy of green WLAN is that all the access points are not always powered on, but rather work on-demand. Though powering off idle access points does not affect data communication, a serious asymmetric matching problem will arise in a WLAN indoor positioning system due to the fact the received signal strength (RSS) readings from the available access points are different in their offline and online phases. This asymmetry problem will no doubt invalidate the fingerprint algorithm used to estimate the mobile device location. Therefore, in this paper we propose a green WLAN indoor positioning system, which can recover RSS readings and achieve good localization performance based on singular value thresholding (SVT) theory. By solving the nuclear norm minimization problem, SVT recovers not only the radio map, but also online RSS readings from a sparse matrix by sensing only a fraction of the RSS readings. We have implemented the method in our lab and evaluated its performances. The experimental results indicate the proposed system could recover the RSS readings and achieve good localization performance. View Full-Text
Keywords: indoor positioning; received signal strength; matrix completion; green WLAN indoor positioning; received signal strength; matrix completion; green WLAN
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ma, L.; Xu, Y. Received Signal Strength Recovery in Green WLAN Indoor Positioning System Using Singular Value Thresholding. Sensors 2015, 15, 1292-1311.

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