Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Reexamination Certificate
2005-01-11
2005-01-11
Le, N. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
C324S533000
Reexamination Certificate
active
06842011
ABSTRACT:
A communication system uses a reflected signal to determine the location of an impedance mismatch along a transmission path. The system provides a forward signal through the transmission path, and obtains, using a feedback loop, forward signal samples and reflected signal samples from the forward signal and a reflected signal, respectively. Assuming a significant mismatch exists, the system identifies a time delay of any impedance mismatch from the forward signal samples and the reflected signal samples. The physical location of the mismatch along the transmission path is determined based on the time delay and a propagation velocity of the forward signal through the transmission path. The magnitude of the mismatch is determined based on a voltage gain calculation, a loss profile of the transmission path, the propagation velocity, and the time delay. In one embodiment, the method is carried out in a communications base station that includes an amplifier, a feedback loop, a feedback receiver, and a processor.
REFERENCES:
patent: 5144250 (1992-09-01), Little
patent: 5751149 (1998-05-01), Oberg et al.
patent: 6104287 (2000-08-01), Meyer
patent: 6307380 (2001-10-01), Hirai et al.
Neilson Gordon B.
Page Trevor A.
Tholl David M.
Dole Timothy J.
Le N.
Nortel Networks Limited
Schwegman Lundberg Woessner & Kluth P.A.
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