Improved weighting algorithm for NLOS radiolocation

Non-Line-of-Sight (NLOS) propagation is a major problem facing accurate radiolocation using Time-of-Arrival (TOA) measurements in wireless communication systems. Weighting is among the important NLOS mitigation approaches whereby the system attempts to localize with both Line-of-Sight (LOS) and NLOS measurements, but provides scaling to minimize the effects of the NLOS contributions. In this paper, we present an improved weighting location algorithm that utilizes the geometrical feature of cell layout and TOA range measurements from three base stations (BSs). The MS location is estimated using weighted ranges that produce special points, called potential points. Simulations studying the performance of the proposed algorithm for different NLOS error models show that the proposed algorithm performance is notably better than traditional algorithms, even under highly NLOS conditions.

[1]  Gordon L. Stüber,et al.  Overview of radiolocation in CDMA cellular systems , 1998, IEEE Commun. Mag..

[2]  J. J. Caffery,et al.  A new approach to the geometry of TOA location , 2000, Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152).

[3]  Christoph F. Mecklenbräuker,et al.  Electromagnetic matched field processing for source localization , 1997, 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[4]  Saleh O. Al-Jazzar,et al.  Scattering-Model-Based Methods for TOA Location in NLOS Environments , 2007, IEEE Transactions on Vehicular Technology.

[5]  J. Holtzman,et al.  The non-line of sight problem in mobile location estimation , 1996, Proceedings of ICUPC - 5th International Conference on Universal Personal Communications.

[6]  Pi-Chun Chen,et al.  A non-line-of-sight error mitigation algorithm in location estimation , 1999, WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466).

[7]  T. Rantalainen,et al.  Mobile station emergency locating in GSM , 1996, 1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access.

[8]  Saipradeep Venkatraman,et al.  A novel ToA location algorithm using LoS range estimation for NLoS environments , 2004, IEEE Transactions on Vehicular Technology.

[9]  Andreu Urruela,et al.  A non-line-of-sight mitigation technique based on ML-detection , 2004, 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[10]  Pak-Chung Ching,et al.  Time-of-arrival based localization under NLOS conditions , 2006, IEEE Transactions on Vehicular Technology.

[11]  N.B. Mandayam,et al.  Decision theoretic framework for NLOS identification , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).