Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-09-06
2005-09-06
Trinh, Sonny (Department: 2687)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456500, C455S404200
Reexamination Certificate
active
06941144
ABSTRACT:
A method and apparatus of determining a lower bound of an excess delay in a time of arrival measurement of a received signal. Determining the lower bound of an excess delay in a time of arrival measurements includes receiving signals from at least two base stations and determining the time difference of arrival between the received signals from their respective base stations. Then estimating a lower bound of excess delay introduced into the signals received from the base stations based on the time of arrival of the signals from the respective base stations and a known distance between the base stations. The lower bound of excess delay may be used to adjust the estimate of a mobile unit's location based on the time of arrival measurements of the received signals.
REFERENCES:
patent: 5890068 (1999-03-01), Fattouche et al.
patent: 5982324 (1999-11-01), Watters et al.
patent: 6154657 (2000-11-01), Grubeck et al.
patent: 6184829 (2001-02-01), Stilp
patent: 6204812 (2001-03-01), Fattouche
patent: 6208297 (2001-03-01), Fattouche et al.
patent: 6330452 (2001-12-01), Fattouche et al.
patent: 6556832 (2003-04-01), Soliman
patent: 6697417 (2004-02-01), Fernandez-Corbaton et al.
patent: 2003/0008622 (2003-01-01), Fernandez-Corbaton et al.
patent: 2003/0054832 (2003-03-01), Stein
patent: 1014103 (2000-06-01), None
Improved location estimation with pulse-ranging in presence of shadowing and multipath excess-delay effects□□Morley, G.D.; Grover, W.D.; Electronics Letters, vol.: 31 , Issue: 18, Aug. 31, 1995 □□pp.: 1609-1610.
Cramer-Rao bound for location estimation of a mobile in asynchronous DS-CDMA systems Botteron, C.; Host-Madsen, A.; Fattouche, M.;Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on , vol.: 4.
James Caffery Jr. et al. May 1998, Subscriber Location in CDMA Cellular Networks IEEE vol. 47 , No. 2, pp 406-416.
G. D. Morley et al. Aug. 31, 1995, Improved Location Estimation with Pulse-Ranging In Presence of Shadowing and Multipath Excess-Delay Effects.
Greenhaus Bruce W.
Kordich Donald C.
Qualcomm Incorporated
Wadsworth Philip
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