Title :
NLOS Mitigation Prior to Range Estimation Smoothing for Wireless Location Systems
Author :
Prieto, J. ; Mazuelas, S. ; Bahillo, A. ; Lorenzo, R.M. ; Fernández, P. ; Abril, E.J.
Author_Institution :
Dept. of Signal Theor. & Commun. & Telematic Eng., Univ. of Valladolid, Valladolid, Spain
Abstract :
Several sources of error disturb the range estimates utilized to infer the position of a mobile user (MU). This paper presents a method which includes two stages of error reduction for a round-trip time (RTT)-based indoor location system. First, systematic error due to non-line of sight (NLOS) propagation is mitigated by adapting the prior-NLOS- measurements-correction (PNMC) technique to the input of a particle filter (PF). Thereupon, the latter is used to filter out the random error in the range estimates which is not assumed to be Gaussian distributed, on the contrary to what is commonly used in the literature. Both techniques are described and their performance is assessed in a real indoor environment achieving a reduction of more than 50% in the total error.
Keywords :
mobile communication; particle filtering (numerical methods); NLOS mitigation; error reduction; mobile user; nonline of sight propagation; particle filter; prior-NLOS-measurements-correction technique; range estimation smoothing; round-trip time-based indoor location system; wireless location systems; Antenna measurements; Communications Society; Computer errors; Indoor environments; Laboratories; Particle filters; Satellite navigation systems; Smoothing methods; Telematics; Time measurement;
Conference_Titel :
Communications (ICC), 2010 IEEE International Conference on
Conference_Location :
Cape Town
Print_ISBN :
978-1-4244-6402-9
DOI :
10.1109/ICC.2010.5502254