Centre National Detudes Spatiales

Zodiac Data Systems

Jean-Pierre Millerioux

Jean-Yves Tourneret

Julia Le Maitre

Martial Coulon

David Bonacci

Raoul Prevost

Alain M Thomas

Xavier Giraud

Jacques Sombrin

Alexandre Guerin

Guy Lesthievent

Xavier Deplancq

Nicolas Pasternak

Mathieu Llauro

Clément Dudal

Clement Dudal

Alain Thomas

The invention relates to a radio communication receiver receiving a radio signal (S) including a main polarisation (MAIN-POL) and a secondary polarisation (X-POL) orthogonal to the main polarisation (MAIN-POL), the receiver including: a unit () for receiving the main polarisation (MAIN-POL) and the secondary polarisation of the received signal, synchronised as a carrier frequency with the main polarisation (MAIN-POL); a unit () for cancelling out the secondary polarisation synchronised with the main polarisation (MAIN-POL) and configured to suppress, from the received signal (S), the interference due to the secondary polarisation (X-POL), the unit () for cancelling out the secondary polarisation including a filtering unit () that receives the main polarisation (MAIN-POL) and the secondary polarisation (X-POL) as input; a unit () for demodulating the filtered signal, located downstream of the cancellation unit and configured to calculate carrier frequency error information and to communicate same by feedback to the upstream receiving unit ().

Radio communication receiver cancelling out the cross polarisation of a received signal

The invention relates to a method for correcting a message the generation of which involves transforming an initial message and inserting bit stuffing into the transformed message, which method comprises providing an observation sequence containing the message to be corrected. A number of path hypotheses are generated via a trellis diagram associated with the transformation. The nodes of the trellis diagram each represent a state of a finite-state machine capable of transforming the initial message and the branches represent the possible transitions between nodes. Among the branches of the trellis diagram, certain represent conditional transitions that may be made only when bit stuffing is present. During the generation of a path hypothesis, bit stuffing is detected and the branches taken are those associated with the detected bit stuffing. The most likely path hypothesis relative to the observation sequence is finally retained.

Method for correcting messages containing bit stuffing

The method according to the invention relates to the decoding of a sequence of symbols, the sequence of symbols having been generated by: calculating a CRC value for an initial message; combining the initial message and the CRC value so as to produce a transformed message; and, encoding the transformed message. The decoding comprises: generating a number of path hypotheses via a trellis diagram corresponding to the trellis diagram of a finite-state machine comprising the encoder and the CRC generator, in which the encoder and the CRC generator are supplied with the same input. According to a preferred embodiment of the method, the trellis diagram is adapted to take into account bit stuffing possibly inserted in the transformed message before encoding.

Decoding method and decoder

Method for calibrating a linearizer and linearized electronic component the method comprises predistortion, in a predistortion linearizer, of a signal upstream of an electronic component to compensate nonlinear distortion. Determining predistortion setting parameters comprises applying a bifrequency test signal to the component and measuring the relative amplitudes of the lines at the output of the component. A variable indicative of the magnitude |Kp| of the AM/PM conversion coefficient of the component is calculated on the basis of these measurements. The predistortion setting parameters are adjusted so as to minimize |Kp|. The method may in particular be implemented in a linearized amplifier device and in an amplifier test bench.

Method for calibrating a linearizer and linearized electronic component

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Toulouse, France

Jean-Pierre Millerioux