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

fYear

2010

fDate

23-27 May 2010

Firstpage

1

Lastpage

5

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications (ICC), 2010 IEEE International Conference on

Conference_Location

Cape Town

ISSN

1550-3607

Print_ISBN

978-1-4244-6402-9

Type

conf

DOI

10.1109/ICC.2010.5502254

Filename

5502254