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Access Point Height Based Location Accuracy Characterization in LOS and OLOS Scenarios

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Abstract

Location estimation in a wireless local area network (WLAN) using received signal strength indication (RSSI) has gained considerable attention in recent years. In a conventional RSSI based indoor WLAN localization, mobile node position is estimated through access point (AP) placed at ceiling height. Researchers have proposed solutions for location estimation in line of sight (LOS) scenarios, by installing the AP at a fixed position. This paper demonstrates the improved location accuracy in LOS and obstructed line of sight (OLOS) scenarios by placing the AP at lower heights. The RSSI variations caused by shadow fading for changing AP heights are used to estimate the location accuracy. The localization performance is computed in terms of Cramer-Rao lower bound (CRLB) of range estimate under dynamic environments which is relatively less complex computation technique and is calibration free. Simulation results reveal that the proposed method has better performance than the multilateration with linearization for access point localization algorithm. The minimum mean localization errors are obtained by deploying the access point at 2 m height. The results also demonstrate that the indoor localization accuracy improves for higher order path loss exponent.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, K.L.E. Society’s College of Engineering and Technology, Belgaum, India

    Udaykumar Naik

  2. Ganga Institute of Technology and Management, Jhajjar, Haryana, India

    Vishram N. Bapat

Authors
  1. Udaykumar Naik
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  2. Vishram N. Bapat
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Correspondence to Udaykumar Naik.

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Naik, U., Bapat, V.N. Access Point Height Based Location Accuracy Characterization in LOS and OLOS Scenarios. Wireless Pers Commun 71, 2247–2258 (2013). https://doi.org/10.1007/s11277-012-0934-6

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