Forward link repeater frequency watermarking scheme

Details Forward link repeater frequency watermarking scheme Forward link repeater frequency watermarking scheme

2005-11-01

2005-11-01

Le, Amanda T. (Department: 2634)

Pulse or digital communications

Repeaters

Including pulse regeneration or conversion

C375S271000, C375S302000, C375S340000, C455S012100, C455S023000, C455S550100, C455S456100, C370S316000

Reexamination Certificate

active

06961367

ABSTRACT:
A forward link repeater frequency watermarking (FLRFWM) system and method that enable accurate position location of mobile stations in areas where repeaters are present by watermarking repeated signals with repeater information. A repeater watermarks a forward link signal with a (unique or non-unique) fast frequency modulation waveform watermark every time a signal passes through the repeater. A mobile station detects and/or identifies the fast frequency watermark on the forward link signal to determine repeater information that aids the network position determination entity or mobile station position location system in determining position location using AFLT and/or A-GPS systems. A forward link fast frequency watermarking system described herein achieves minimal impact on FL, AFLT, and GPS performance, good detection, identification and false alarm probabilities, short time-to-detect/identify, and good detection/identification sensitivity.

REFERENCES:
patent: 6108364 (2000-08-01), Weaver, Jr. et al.
patent: 6438381 (2002-08-01), Alberth, Jr. et al.
patent: 6501955 (2002-12-01), Durrant et al.
patent: 6690662 (2004-02-01), Komara et al.
patent: 2002/0044594 (2002-04-01), Bongfeldt
patent: 2003/0186691 (2003-10-01), Baek

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