Measuring round trip times to determine the distance between WLAN nodes
NETWORKING'05 Proceedings of the 4th IFIP-TC6 international conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communication Systems
Wideband radio propagation modeling for indoor geolocation applications
IEEE Communications Magazine
A new time-based algorithm for positioning mobile terminals in wireless networks
EURASIP Journal on Advances in Signal Processing
A robust to multi-path ranging technique over IEEE 802.11 networks
Wireless Networks
Modelling ranging error of indoor TOA-based position system based on receive signal strength
International Journal of Sensor Networks
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Indoor ranging and location in WLAN is possible through obtaining Round-Trip-Time (RTT) measurements at data link level. This procedure allows using the existing IEEE 802.11 WLAN infrastructure with minor changes in order to provide an accurate estimation of the position of the mobile terminal. In this paper, an approach to overcome the undesired impact of the indoor radio-channel multipath on the accuracy of the TOA estimation between the terminal and an Access Point is presented. Ranging errors caused by multipath are quantified for different channel profiles: Dominant Direct Path (DDP), Non Dominant Direct Path (NDDP) and Undetectable Direct Path (UDP). However, the main challenge corresponds to be able to identify this profile (i.e. the multipath condition) from the obtained RTT measurements at IEEE 802.11 link level. This allows applying a TOA estimation algorithm sensitive to the detected profile in order to minimize the TOA estimation error.