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WiFi-Based Indoor Line-of-Sight Identification

Zimu Zhou,Zheng Yang,Chenshu Wu,Longfei Shangguan,Haibin Cai,Yunhao Liu,L. Ni

Published 2015 in IEEE Transactions on Wireless Communications

ABSTRACT

Wireless LANs, particularly WiFi, have been pervasively deployed and have fostered myriad wireless communication services and ubiquitous computing applications. A primary concern in designing these applications is to combat harsh indoor propagation environments, particularly Non-Line-Of-Sight (NLOS) propagation. The ability to identify the existence of the Line-Of-Sight (LOS) path acts as a key enabler for adaptive communication, cognitive radios, and robust localization. Enabling such capability on commodity WiFi infrastructure, however, is prohibitive due to the coarse multipath resolution with MAC-layer received signal strength. In this paper, we propose two PHY-layer channel-statistics-based features from both the time and frequency domains. To further break away from the intrinsic bandwidth limit of WiFi, we extend to the spatial domain and harness natural mobility to magnify the randomness of NLOS paths while retaining the deterministic nature of the LOS component. We propose LiFi, a statistical LOS identification scheme with commodity WiFi infrastructure, and evaluate it in typical indoor environments covering an area of 1500 m 2. Experimental results demonstrate that LiFi achieves an overall LOS detection rate of 90.42% with a false alarm rate of 9.34% for the temporal feature and an overall LOS detection rate of 93.09% with a false alarm rate of 7.29% for the spectral feature.

PUBLICATION RECORD

  • Publication year

    2015

  • Venue

    IEEE Transactions on Wireless Communications

  • Publication date

    2015-06-22

  • Fields of study

    Computer Science, Engineering

  • Identifiers
    DOI 10.1109/TWC.2015.2448540
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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