| Patent application number | Description | Published |
|---|
| 20080247482 | Ofdm Reception in Multi-Antenna Mode - A signal is received by P antennas. It includes frames having symbols occupying respective positions distributed along an axis of time and of frequency, a frame including M blocks having N reference symbols M groups of P weighting coefficients are determined, each one of the groups relating to one of the blocks emitted, with the coefficients of a group being associated to the blocks which are received on the P antennas and which correspond to the block emitted relating to the group. The coefficients are determined so as to increase via a threshold value, an error value for each block emitted, between the reference symbols of the block emitted, and the symbols obtained using the symbols received on each antenna at the positions of reference symbols corresponding to the block emitted and the associated coefficients. Then, weighting coefficients are obtained for the other symbols of the frame Finally, a composite signal is generated by summing up the symbols received respectively weighted by the associated weighting coefficients. | 10-09-2008 |
| 20080268794 | Linearization in a transmission chain - A transmission chain comprises a power amplifier adapted for receiving as input a signal to be amplified S | 10-30-2008 |
| 20080273630 | DECODING SYMBOLS OF A SIGNAL DISTRIBUTED ACCORDING TO FREQUENCY AND TIME DIMENSIONS - A signal of OFDM type received in a radio receiver via a propagation channel includes symbols distributed according to frequency and time. The receiver determines likelihoods of the symbols, decodes the received signal to yield a decoded signal as a function of the likelihoods of the symbols, and estimates an instantaneous noise power of the received signal as a function of a difference between the received signal and a reconstructed noise-free signal derived from the decoded signal. A filtering module determines a bounded distribution of the instantaneous noise power as a function of frequency and/or time, and filters the distribution to yield a filtered noise variance as a function of a frequency and/or time parameter of the propagation channel. A corrector weights the likelihoods of the symbols of the received signal to be decoded as a function of the filtered noise variance. | 11-06-2008 |
| 20090074105 | Correction of distortions in an emission chain - An emission chain is suitable for receiving an input signal and for providing a signal to be emitted. It comprises a processing pathway for the input signal which includes a digital signal decomposition according to N signal components, with N an integer greater than or equal to 2, said N signal components, on the one hand, being converted from a digital form into an analog form and, on the other hand, following respectively distinct physical pathways, said physical pathways inducing first respective delays on the N signal components. The input chain comprises a power amplifier. | 03-19-2009 |
| 20090122900 | Noise Power Interpolation in a Multi-Carrier System - A signal is received in a telecommunication network in the form of P signals received on P corresponding antennas, where P is greater than or equal to 1. The received signals correspond to a multi-carrier signal transmitted in the form of frames comprising symbols occupying corresponding positions distributed along a time axis and along a frequency axis; a frame comprising M blocks each having at least N reference symbols. The reference symbols in each of the blocks satisfy a first maximum spacing between each other along the time axis and a second maximum spacing between each other along the frequency axis, less than a first value and a second value respectively, M being an integer number equal to at least two. M estimated noise power values are determined at frame level, each related to one of the M emitted reference symbol blocks. Values of the estimated noise power for the other symbols in the frame are then obtained from the determined estimated noise power values. | 05-14-2009 |
| 20100290555 | SIGNAL EMISSION BY PLURAL ANTENNAS - A radio communication emitter includes at least two antennas for emitting a signal including encoded bits that are converted into symbols distributed on subcarriers and in time intervals. The emitter includes a signal divider for distributing the set of the signal symbols into as many disjoined subsets of signal symbols as the antennas that the emitter comprises. Each subset is dedicated to one of the antennas. The union of the subsets is the set of the signal symbols. Symbols are distributed in at least two subsets for at least one time interval or for at least one subcarrier of the signal. The antennas synchronously emit the symbol subsets. The symbol subsets can comprise a substantially identical number of symbols to reduce a deviation between the power peaks and the average power of the signal emitted by each antenna. | 11-18-2010 |
| 20100322339 | REDUCTION OF INTERFERENCE IN AN OFDM SIGNAL WITH WEIGHTING VECTORS EVOLVING IN VECTOR SUBSPACES - 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. | 12-23-2010 |
