Thomson-Csf

Robert Berranger

Jean-Luc De Gouy

Jean-Jacques Monot

Gilbert Multedo

The device comprises a current/voltage transformer (,) coupled by its primary winding between a matching device (,) of an antenna (,) and the output of an amplifier (,) for the supply or the antenna (,), a first (,) and a second (,) baseband digital frequency transposition device respectively coupled to the output of the amplifier (,) and to the secondary winding of the transformer (,), and a computation device (,) to compute the impedance of the antenna (,) from signals given by the first frequency transposition device (,) and the second frequency transposition device (,).

Method and device for the measurement of antenna impedance

The method consists of the adding of a dither signal of constant amplitude, frequency-modulated by noise, to the signal applied to the input of the converter. An automatic control link is set up between the level of the added interference signal and the signal applied to the input of the converter so that the level of the input signal added to the level of the added interference signal is equal to the level of the full scale signal of the converter. Application to digital communications radio receivers.

Device to compensate for the non-linearity of an analog/digital converter

A process which adjusts the transmission and reception chains of the paths formed by a base station of a system for radio communication between mobiles which after calibration of the antenna base adjusts the reception chains relating to each path by distributing a first specified adjustment signal synchronously over each of the reception chains and calculating an equalization filter which inverts the transfer functions related to each reception chain. The process next adjusts the transmission chains related to each path by distributing a second specified adjustment signal synchronously over each of the transmission chains, by extracting from each of the paths a part of a transmission signal before the transmission signal is sent to the antenna base so as to re-inject that part of the transmission signal into the reception chains, and by calculating an equalization filter which inverts the transfer functions related to each transmission chain. Finally, the process receives via the equalization filters previously calculated for the reception chains reception signals originating from the antenna base, or transmits via the equalization filters previously calculated for the transmission chains the transmission signals originating from the multipath transmission/reception device.

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Elancourt, France

Robert Berranger