Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-10-03
2006-10-03
Phu, Phuong (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S149000, C375S367000, C455S456100
Reexamination Certificate
active
07116701
ABSTRACT:
A base station comprises a plurality of antennas. Each of the antennas is separated by a known distance. A first spread spectrum signal is transmitted having a first code. Using the plurality of antennas, a second spread spectrum signal is received having a second code. The second spread spectrum signal is time synchronized with the first spread spectrum signal. A distance determination is made based on in part a timing difference between the second code of the received second spread spectrum signal and the first code of the base station's transmitted first spread spectrum signal. A phase difference of a carrier signal of the second spread spectrum signal as received by each of the plurality of antennas is compared. An angle of the received second spread spectrum signal is determined using the known distance between the antennas and the phase difference. A location of a source of the second spread spectrum signal is determined using the determined angle and the distance determination.
REFERENCES:
patent: 4728959 (1988-03-01), Maloney et al.
patent: 5506864 (1996-04-01), Schilling
patent: 5600706 (1997-02-01), Dunn et al.
patent: 5732354 (1998-03-01), MacDonald
patent: 5736964 (1998-04-01), Ghosh et al.
patent: 5799010 (1998-08-01), Lomp et al.
patent: 5945948 (1999-08-01), Buford et al.
patent: 6026304 (2000-02-01), Hilsenrath et al.
patent: 6047192 (2000-04-01), Maloney et al.
patent: 6070079 (2000-05-01), Kuwahara
patent: 6112095 (2000-08-01), Wax et al.
patent: 6148195 (2000-11-01), Schuchman et al.
patent: 6148219 (2000-11-01), Engelbrecht et al.
patent: 6163696 (2000-12-01), Bi et al.
patent: 6226317 (2001-05-01), Bruckert et al.
patent: 6229844 (2001-05-01), Kong
patent: 6249680 (2001-06-01), Wax et al.
patent: 6353601 (2002-03-01), Siira
patent: 6397073 (2002-05-01), Hottinen
patent: 6456852 (2002-09-01), Bar et al.
patent: 0865223 (1998-09-01), None
patent: WO9747148 (1997-12-01), None
patent: WO9818018 (1998-04-01), None
Zagami, Parl, Bussgang and Melillo, “Providing Universal Location Services Using a Wireless E911 Location, Network”, IEEE Communications Magazine, Apr. 1998.
B.P. Lathi, “Modern Digital and Analog Communication Systems” HRW © 1983, pp. 63-65.
InterDigital Technology Corporation
Phu Phuong
Volpe and Koenig P.C.
LandOfFree
Base station using an antenna array for location determination does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Base station using an antenna array for location determination, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Base station using an antenna array for location determination will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3652073