Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Airbus Ds Slc

Airbus Ds Sas

Cnam Conservatoire National Des Arts Des Metiers

Nicolas Gregis

Josy Cohen

Philippe Mege

Laurent Martinod

Nicolas Ravot

Olivier Perrin

Luc Fety

Pierre Blanchart

Baudouin Naline

A method for determining at least one lineal parameter of a transmission line comprises the following steps: determining at least one measurement of the complex propagation factor &#x3b3; as a function of frequency on the basis of at least one measurement carried out on the transmission line, determining at least one measurement of the lineal attenuation &#x3b1; of the transmission line equal to the real part of the measurement of the complex propagation factor &#x3b3; and/or at least one measurement of the phase factor &#x3b2; of the transmission line equal to the imaginary part of the measurement of the complex propagation factor &#x3b3;, filtering the measurement of the lineal attenuation &#x3b1; and/or the measurement of the phase factor &#x3b2; on the basis of a polynomial frequency regression model dependent on the physical characteristics of the transmission line.

Method of determining lineal parameters of a transmission line

A method for characterizing a segment of a transmission line, a reference signal being injected into the line and a time-domain measurement of the reflection of the reference signal in the line being carried out, the method comprises the following steps: applying a deconvoluting step to the time-domain measurement so as to generate a deconvoluted temporal sequence comprising a plurality of amplitude peaks each corresponding to an impedance discontinuity; removing, from the amplitude of at least one obtained peak, the contribution of at least one secondary reflection of the signal from an impedance discontinuity; deducing, from the temporal position of each peak, a position of an associated impedance discontinuity in the line segment; and deducing, from the amplitude of each peak, an estimate of the real part of the reflection coefficient of a wave reflected from each identified impedance discontinuity.

Method of characterizing a section of a transmission line, in particular section corresponding to a connector or series of connectors linking a measurement apparatus to a cable

This interference reduction method in a receiver () comprising at least two antennas (), each receiving a signal transmitted through a radio propagation channel, comprises the following steps: &#x2014;weighting () of each of the signals received with a weighting vector associated respectively with a respective antenna of the receiver; &#x2014;combination () of the weighted signals received to obtain a combined received signal; &#x2014;weighting () of a reference signal with another weighting vector; &#x2014;comparison () of the combined received signal and the weighted reference signal to obtain an error; and &#x2014;determination () of the weighting vectors with the help of the maximum a posteriori criterion by maximizing the probability of realization of the said weighting vectors conditionally with the error obtained.

Interference reduction method

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Fresnes, France

Nicolas Gregis