Cassidian Sas

Airbus Ds Slc

Airbus Ds Sas

Eads Secure Networks

Cnam-conservatoire National Des Arts Et Metiers

Cnam Conservatoire National Des Arts Des Metiers

Laurent Martinod

Philippe Mege

Hang Nguyen

Luc Fety

Alina Alexandra Florea

Christophe Molko

Olivier Perrin

Eric Georgeaux

Nicolas Gregis

Alina-Alexandra Florea

A method allocates radio resources to a plurality of communications in a broadband telecommunication system, each communication being associated with at least one piece of user equipment, at least one of the communications being associated with a single piece of user equipment, the radio resources being distributed according to time and frequency between blocks of resources. The plurality of communications forms at least one group of communications and at least the same block of resources is allocated to the group of communications in order to transmit the plurality of communications.

Method for allocating radio resources in a telecommunications system

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

A method for demodulating a signal in a receiver including at least two antennas, each receiving a signal, the received signals corresponding to a single emitted signal including symbol frames in which certain symbols, referred to as driver symbols, are known to the receiver, the method including: noise whitening in order to form two combined signals, the noise components of which are separate; normalizing the noise components of the combined signals in order to form two signals, the noise components of which are separate and have equal average standards; and performing signal demodulation with the maximum combination of the signal-to-noise ratio on the two signals, the noise components of which are separate and which have equal average standards, wherein during the first noise-whitening step for forming the two combined signals, the latter are determined retroactively using the maximum criterion.

Method for demodulating a signal

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 a plurality of classes. The present encoding method includes the following steps: Related decoding methods, as well as encoding and decoding devices are also disclosed.

Error correction encoding method, decoding method and associated devices

This method for the estimation of a channel between an emitter and a receiver, where the said emitter emits a signal comprising symbol frames distributed in time and frequency, among which pilot symbols known to the receiver, is characterized in that it comprises the following steps: &#x2022;&#x2014;computation () of a covariance matrix Mand Mof the channel in the frequency and time domains respectively; &#x2022;&#x2014;decomposition () of the covariance matrices Mand Minto eigenvectors according to the relations M&#x2212;WNWand M&#x2212;WNW; &#x2022;&#x2014;computation () of the Kronecker product of the matrices NVand Wto obtain an eigenvector matrix W; &#x2022;&#x2014;computation () of a diagonal eigenvalue matrixequal to the Kronecker product of the eigenvalue matrices Nand N; and &#x2022;&#x2014;estimation of the channel with the help of pilot symbols and matrices W and N using the maximum a posteriori or quadratic error minimisation criterion.

Method for estimating a radio channel

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.

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.

To reduce interferences in signals received by a receiver through a propagation channel, each including symbols distributed according to frequency and time dimensions and corresponding to a common emitted signal, the receiver weights an estimate of the emitted signal and the received signals by weighting vectors evolving in vector subspaces representing time variations and frequency variations of the channels for propagating the signals between an emitter and the receiver. These vector subspaces are defined by matrices, some columns of which are suppressed as a function of frequency and time constraints of the channel. The receiver minimizes a function of the difference between the sum of weighted received signals and the weighted estimate of the emitted signal in order to estimate the emitted signal as a function of the weighting vectors and the received signals.

Growing community of inventors

Le Chesnay, France

Laurent Martinod