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
07577445
ABSTRACT:
Non-line-of-sight (NLOS) identification and mitigation are carried out in a wireless positioning system based on channel statistics derived from multipath components of a received signal. The statistics may be based on the kurtosis, the mean excess delay spread, or the root mean square delay spread. The results are justified using IEEE 802.15.4a ultrawideband channel models. Amplitude and delay statistics based on the IEEE models are shown to be log-normal random variables. A joint likelihood ratio test is presented for the LOS and NLOS identification.
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: 7065368 (2006-06-01), You et al.
patent: 2004/0110514 (2004-06-01), Kim et al.
patent: 2006/0046659 (2006-03-01), Haartsen et al.
patent: 1 469 685 (2004-10-01), None
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 interative 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.
“Nist/sematech e-handbook of statistical methods,” 2006. [Online]. Available: http://www.6sigma.us/handbook/eda/section3/eda35b/htm.
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; 4 pages.
Chong Chia-Chin
Guvenc Ismail
Beamer Temica M
Haynes and Boone LLP
NTT DoCoMo Inc.
LandOfFree
Line-of-sight (LOS) or non-LOS (NLOS) identification method... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Line-of-sight (LOS) or non-LOS (NLOS) identification method..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Line-of-sight (LOS) or non-LOS (NLOS) identification method... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4120361