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Research Letters in Signal Processing
Volume 2008, Article ID 970461, 4 pages
Research Letter

NLOS Mitigation for TOA Location Based on a Modified Deterministic Model

1School of Electronic and Information Engineering, Dalian University of Technology, Dalian 116024, China
2Mobile Communication Laboratory, Yeungnam University, Kyongsan-city, Kyongbuk 712-749, South Korea

Received 13 February 2008; Accepted 15 April 2008

Academic Editor: A. G. Constantinides

Copyright © 2008 Hong Tang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Wireless location becomes difficult due to contamination of measured time-of-arrival (TOA) caused by non-line-of-sight. In this letter, TOA measurements seen at base stations are adjusted by scale factors, and a modified deterministic model is built. An effective numerical solution is proposed to resolve the scale factors and mobile position. A simulation comparison of four algorithms indicates that the proposed algorithm outperforms the other three algorithms.