Cassidian Sas

Eads Secure Networks

Other

Airbus Ds Sas

Matra Nortel Communications

Airbus Ds Slc

Cassidian Finland Oy

Nortel Networks France

Christophe Molko

Philippe Mege

Laurent Martinod

Hang Nguyen

Olivier Gagey

Alina Alexandra Florea

Gérard Marque-Pucheu

Christophe Brutel

Olivier Perrin

Marc Mouffron

Matti Limingoja

Frédéric Rosin

Fabrice Belveze

Frederic Rosin

A device for processing a received signal by a receiver disrupted by a transmitter, wherein the transmitters and receiver are co-located, includes: a first coupler configured to take a first reference signal; an analog circuit for processing the first reference signal; a second coupler configured to combine the modified reference signal with the signal received by an antenna of the receiver; a first analog-to-digital conversion module digitizing the first reference signal; the second analog conversion module digitizing the combined signal in order to deliver a digital combined signal to the digital signal-processing device, wherein signal-processing device delivers a resulting digital signal to a data-processing module of the receiver device.

Device and method for processing a signal received by a receiver disrupted by a transmitter

A method for reducing the crest factor of a wideband signal including N narrowband signals, N being a natural integer greater than or equal to two, the method, implemented by an emitting equipment, including phase shifting the narrowband signals between them in such a way as to reduce the crest factor.

Method for reducing the crest factor wide band signal

This transmission comprising a first transmission of a packet (), comprising the steps consisting in: a first processing () of said packet () to obtain a first packet (); and a coding () of the first packet (); wherein, when the first coded packet is received erroneous, the method comprises a second transmission of said packet, comprising: the steps implemented in the transmitter, consisting in: a second processing () of said packet () to obtain a second packet (); and a coding () of the second packet (); and the steps implemented in the receiver, consisting in: a modification of the first and/or the second coded packets to obtain two packets in which the difference due to the first and second processings is compensated for: a combination () of both packets according to a HARQ procedure; and a decoding () of the combined packet.

Data packet transmission method

For clipping a signal with respect to a clipping threshold (A), a signal portion above the clipping threshold and a peak (Pk) in the signal portion are detected, a clipping function depending on end times (t, t) of the signal portion, the amplitude of the detected peak and the clipping threshold is derived, and the signal portion is clipped by multiplying it by the clipping function. The first portion can be enlarged up to the lowest boundary points (t+1, t&#x2212;1) on the first ascending portion and the last descending portion of the detected peak. Spectral leakage in the sidebands out to the frequency band of the clipped signal is eliminated by a filtering device. The filtered dipped signal to the input of the amplifier has peaks as close to the saturation threshold of a power amplifier as possible.

PAPR reduction using clipping function depending on the peak value and the peak width

An error correction encoding method is provided for encoding source digital data, having the form of a frame, wherein the data can be classified into N classes, where N is an integer at least equal to 2. The encoding method includes: A decoding method is provided for decoding encoded data with the encoding method, using an associated encoding device and a decoding device.

Error correction encoding method, decoding method and associated devices

An error correction encoding method is provided for encoding in parallel source digital data, having the form of a frame, wherein said data can be classified into N classes, where N is an integer at least equal to 2. The encoding method includes: Also disclosed is a related decoding method, as well as an associated encoding and decoding devices.

A mobile terminal of a digital cellular radiocommunication system that is in the receiving phase in a group call while roaming in a current cell, indicates to a fixed network element of the system, a given destination cell out of a number N of cells adjacent to the current cell. The system uses a time and/or frequency division multiple access method, and any modulation method. The mobile terminal sends an identification sequence of the destination cell in a time slot of an inbound signaling channel which is a contention channel. The identification sequence comprises a predetermined identification pattern out of a determined number P of identification patterns of different respective values, where P is an integer number such that 1&#x3c;P&#x2266;N. The values of the P identification patterns are such that they correspond to mutually-orthogonal modulated signals.

Handover management in group calls

A method of synchronization on the uplink channel of a Simulcast network with a plurality of fixed receivers (BS-BS) and a selection unit (), comprises the following steps. All the receivers are placed in a synchronization search mode (), in which they search for a synchronization pattern sent by the mobile terminal over the uplink channel. When a receiver detects the synchronization pattern, it produces an initial synchronization context (SC()), which indicates the delay of the radio signal relative to a time reference of the network, and transmits it () to the selection unit. The latter broadcasts it () to all the receivers that use it to start processing the radio signal. Then, each receiver maintains its synchronization context and transmits it (-) to the selection unit on each frame. At regular intervals, the value of an updated synchronization context (SC()) is broadcast () to the receivers. Advantage: the synchronization of a receiver which begins to receive the radio signal during a call or alternate turn is facilitated.

Method of synchronization of the uplink channel of a simulcast network

The invention concerns a device for producing a phase and amplitude modulated signal (G) suitable for radio transmission via an antenna (), based on the EER technique and means () for temporal clamping of a phase controlling signal (D) and an amplitude controlling signal (F) so that the phase modulating component is synchronized with the amplitude modulating component in the output signal (G).

Device for producing a phase and amplitude modulated radio frequency signal

A transmitter produces radio signal bursts in periodic time slots allocated to a time-division multiplexed channel. The radio signal of each burst is made up of digital symbols comprising two training sequences enabling the receiver to estimate demodulation parameters and information symbols which the receiver can estimate by a demodulation applied using the estimated parameters. The two training sequences are placed at the start and the end of the burst so that the receiver uses them to demodulate the received signal in the order of the symbols and demodulate the received signal again in the reverse order of the symbols.

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Villepreux, France

Christophe Molko