Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-08-01
2009-08-18
Beamer, Temica M (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456500, C455S506000, C455S067110, C455S067160
Reexamination Certificate
active
07577446
ABSTRACT:
A method mitigates NLOS conditions based on weighted least squares (WLS) technique, in which the weights are derived from multipath components (MPCs) of the received signals. The weighting methodology can be used with both linear and non-linear least squares models, as well as different other NLOS mitigation schemes, such as residual based algorithms or maximum likelihood techniques.
REFERENCES:
patent: 5058200 (1991-10-01), Huang et al.
patent: 5644572 (1997-07-01), Olds et al.
patent: 5754950 (1998-05-01), Petersson et al.
patent: 6047192 (2000-04-01), Maloney et al.
patent: 6748224 (2004-06-01), Chen et al.
patent: 7065368 (2006-06-01), You et al.
patent: 7085537 (2006-08-01), Fernandez-Corbaton et al.
patent: 7170441 (2007-01-01), Perl et al.
patent: 2004/0110514 (2004-06-01), Kim et al.
patent: 2006/0046659 (2006-03-01), Haartsen et al.
B. Alavi and K. Pahlavan, “Analysis of undetected direct path in time of arrival based UWB indoor geolocation,” inProc. IEEE Vehic. Technol. Conf. (VTC), vol. 4, Dallas, TX, Sep. 2005, pp. 2627-2631.
I. Guvenc, Z. Sahinoglu, A. F. Molisch, and P. Orlik, “Non-coherent TOA estimation in IR-UWB systems with different signal waveforms,” inin Proc. IEEE Int. Workshop on Ultrawideband Networks(UWBNETS), Boston, MA, Oct. 2005, pp. 245-251, (invited paper).
D. Dardari, C. C. Chong, and M. Z. Win, “Analysis of threshold-based TOA estimators in UWB channels,”14th European Signal Processing Conference(EUSIPCO 2006), Florence, Italy, Sep. 2006, (Invited Paper).
D. Dardari, C. C. Chong, and M. Z. Win, “Improved lower bounds on time of arrival estimation error in UWB realistic channels,”IEEE Intl. Conf. on Ultra-Wideband(ICUWB 2006), Waltham, MA, USA, Sep. 2006 (Invited Paper).
M. P. Wylie and J. Holtzman, “The non-line of sight problem in mobile location estimation,” inProc. IEEE Int. Conf. Universal Personal Commun., Cambridge, MA, Sep. 1996, pp. 827-831.
J. Borras, P. Hatrack, and N. B. Mandayam, “Decision theoretic framework for NLOS identification,” inProc. IEEE Vehicular Technol. Conf.(VTC), vol. 2, Ontario, Canada, May 1998, pp. 1583-1587.
S. Gezici, H. Kobayashi, and H. V. Poor, “Non-parametric non-line-ofsight identification,” inProc. IEEE Vehic. Technol. Conf.(VTC), vol. 4, Orlando, FL, Oct. 2003, pp. 2544-2548.
A. Rabbachin, I. Oppermann, and B. Denis, “ML time-of-arrival estimation based on low complexity UWB energy detection,” inProc. IEEE Int. Conf. Ultrawideband(ICUWB), Waltham, MA, Sep. 2006.
P. C. Chen, “A non-line-of-sight error mitigation algorithm in location estimation,” inProc. IEEE Int. Conf. Wireless Commun. Networking(WCNC), vol. 1, New Orleans, LA, Sep. 1999, pp. 316-320.
R. Casas, A. Marco, J. J. Guerrero, and J. Falco, “Robust estimator for non-line-of-sight error mitigation in indoor localization,”Eurasip J. Applied Sig. Processing, pp. 1-8, 2006.
Y. T. Chan, W. Y. Tsui, H. C. So, and P. C. Ching, “Time-of-arrival based localization under NLOS conditions,”IEEE Trans. Vehic. Technol., vol. 55, No. 1, pp. 17-24, Jan. 2006.
B. Li, A. G. Dempster, and C. Rizos, “A database method to mitigate the NLOS error in mobile phone positioning,” inProc. IEEE Position Location and Navigation Symposium(PLBSS), San Diego, CA, Apr. 2006.
X. Li, “An iterative NLOS mitigation algorithm for location estimation in sensor networks,” inProc. IST Mobile and Wireless Commun. Summit, Myconos, Greece, Jun. 2006.
L. Cong and W. Zhuang, “Non-line-of-sight error mitigation in mobile location,” inProc. IEEE INFOCOM, Hong Kong, Mar. 2004, pp. 650-659.
J. Riba and A. Urruela, “A non-line-of-sight mitigation technique based on ML-detection,” inProc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing(ICASSP), vol. 2, Quebec, Canada, May 2004, pp. 153-156.
S. Venkatesh and R. M. Buehrer, “A linear programming approach to NLOS error mitigation in sensor networks,” inProc. IEEE IPSN, Nashville, Tennessee, Apr. 2006.
C. L. Chen and K. T. Feng, “An efficient geometry-constrained location estimation algorithm for NLOS environments,” inProc. IEEE Int. Conf. Wireless Networks, Commun., Mobile Computing, Hawaii, USA, Jun. 2005, pp. 244-249.
X. Wang, Z. Wang, and B. O. Dea, “A TOA based location algorithm reducing the errors due to non-line-of-sight (NLOS) propagation,”IEEE Trans. Vehic. Technol., vol. 52, No. 1, pp. 112-116, Jan. 2003.
J. J. Caffery and G. L. Stuber, “Overview of radiolocation in CDMA cellular systems,”IEEE Commun. Mag., vol. 36, No. 4, pp. 38-45, Apr. 1998.
F. Gustafsson and F. Gunnarsson, “Mobile positioning using wireless networks: Possibilites and fundamental limitations based on available wireless network measurements,”IEEE Sig. Proc. Mag., vol. 22, No. 4, pp. 41-53, Jul. 2005.
V. Dizdarevic and K. Witrisal, “On impact of topology and cost function on LSE position determination in wireless networks,” inProc. Workshop on Positioning, Navigation, and Commun.(WPNC), Hannover, Germany, Mar. 2006, pp. 129-138.
PCT International Search Report for International Application No. PCT/US2007/075087; 3 pages.
PCT Written Opinion of the International Searching Authority for International Application No. PCT US2007/075087; 3 pages.
Chong Chia-Chin
Guvenc Ismail
Beamer Temica M
Haynes and Boone LLP
NTT DOCOMO Inc.
LandOfFree
Weighted least square localization method exploiting... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Weighted least square localization method exploiting..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Weighted least square localization method exploiting... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4092412