The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 2008
Filed:
May. 11, 2004
Axel Frank Jensen, Fredensborg, DK;
Fredrik Lindqvist, Älvsjö, SE;
Adam Wiå, Haninge, SE;
Telefonaktiebolaget LM Ericsson, Stockholm, SE;
Abstract
The length and attenuation of a signal line between a transmitter and a customer premises equipment is to be estimated. A frequency dependent line input impedance (Z(f)) as seen from the transmitter, is measured and an absolute impedance value (œ Z(f) œ) is generated. The latter is shown as a curve (A1) in the diagram with the frequency (f) on the abscissa and the impedance (œ Z(f) œ) on the ordinate. Extreme values (Max., Max, Max; Min, Min, Min) arc denoted and a frequency distance (FD-FD) between two consecutive of the extreme values is generated. The line length (L) is generated as L=½·vop/FD, in which vop is the velocity of propagation of a signal on the line. The attenuation is estimated by multiplying the line length with an average attenuation value for the actual line type. The advantages are that the line length can be estimated with good accuracy in a simple manner for short lines and that the line attenuation is estimated in a simple manner.