Patent ID: 8705636
Filing Date: 2014-04-22
Classification: H04B

Abstract:
1. A method for estimating properties of a transmission line, said transmission line having a first end and a second end opposite to the first end, comprising the steps of: measuring a spectrum of a noise at the first end of the transmission line; and estimating one or more transmission properties based on one or more features of said spectrum, wherein said noise enters said transmission line at an intermediate location between the first end and the second end, wherein said one or more transmission property estimates are estimates of transmission properties of the transmission line or a segment of the transmission line, said segment being the part of the transmission line between the location where the noise enters the transmission line and the second end of the transmission line, wherein the measuring of the spectrum results in measured noise characteristic data of a noise interference pattern comprising extreme values, including one or more of maximum values at resonance frequencies and identified minimum values at anti-resonance frequencies, wherein said one or more transmission properties include whether the line termination of the line or line segment is high impedance or low impedance, and is determined by the steps of: determining autocorrelation function values of the measured spectrum of the noise; determining if the greatest extreme value is a peak or a dip of said autocorrelation function values; and setting the line termination as high impedance if the greatest extreme value is a peak and setting the line termination as low impedance if the greatest extreme value exhibits a dip.