Method for transmission line analysis
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsAntoni Fertner, Per Ola Börjesson, Klas Ericson
Life of this patent
Estimating the term…
Abstract
The present invention concerns methods for estimating one or more transmission properties of a telecommunications transmission line. Estimates of the line input impedance, Zin at a frequency ƒ, and the line capacitance Ĉ are made. An estimate is then made in dependence of Ĉ, the frequency ƒ and a value Γ, where Γ satisfies the relationship Γ coth (Γ)=Zin·jωĈ, and ω=2πƒ. Accuracy may be improved by least squares fitting a curve to a set of intermediate values and then generating an estimate from the coefficients of the curve.
Claims15
A method for determining an estimate of at least one transmission property of a telecommunication transmission line, the method comprising the steps of:
- generating an estimate of a complex impedance Zin of the transmission line at a frequency ƒ;
- generating an estimate of a capacitance, Ĉ, of the transmission line;
- and
- generating an estimate of the at least one transmission property of the line in dependence of Ĉ, the frequency ƒ and a value Γ, where Γ satisfies the relationship Γ coth (Γ)=Zin·jωĈ, and ω=2πƒ;
- wherein a value X is generated from the relationship Γ coth (Γ) =Zin·jωĈ, where X is Γ, Γ2 Γ2/ωĈ or one of them multiplied by a predetermined value, or the real, or imaginary part of any one of those, and where X is used to make the estimate of the at least one transmission property;
- and
- wherein X is an independent solution for the angular frequency ω.
Dependencies are inferred from the claim text.