Wireless Location in CDMA Cellular Radio Systems
Wireless Location in CDMA Cellular Radio Systems
Least squares algorithms for time-of-arrival-based mobile location
IEEE Transactions on Signal Processing
Nonline-of-sight error mitigation in mobile location
IEEE Transactions on Wireless Communications
Analysis of wireless geolocation in a non-line-of-sight environment
IEEE Transactions on Wireless Communications
The accuracy enhancements of virtual antenna for location based services
WISM'10 Proceedings of the 2010 international conference on Web information systems and mining
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The presence of non-line-of-sight (NLOS) propagation is a key issue that limits the accuracy of wireless location systems. The lack of direct sight causes the measurements obtained by location systems to be so unpredictable that they can produce high inaccuracies in the estimation of the mobile station location. In this paper we propose a novel technique to improve location reliability and accuracy in cases where NLOS propagation is present. For that, in registers of time of arrival (TOA) measurements taken from each base station (BS) in view, we detect the presence of NLOS propagation and estimate the ratio of the measurements coming from NLOS propagation. With this estimate we can assess how much is NLOS propagation affecting the measurements taken from each BS and then we can identify the best measurements and BSs to achieve the highest accuracies in location.