Abstract: Some embodiments are directed to a method of transmission from at least one transmit antenna to all or some of n reception antennas including at least one transmission step suitable for transmitting a first binary information item by using the absence of focusing from the transmit antenna to any one of the n reception antennas, during a predetermined integer number k of symbol times and/or a modulation of the power transmitted by at least one transmit antenna, participating in a coding of a second binary information item. Some other embodiments are directed to a receiver-decoder suitable for reception according to the method.

Abstract: Some embodiments are directed to a method of transmission from at least one transmit antenna to all or some of n reception antennas including at least one transmission step suitable for transmitting a first binary information item by using the absence of focusing from the transmit antenna to any one of the n reception antennas, during a predetermined integer number k of symbol times and/or a modulation of the power transmitted by at least one transmit antenna, participating in a coding of a second binary information item. Some other embodiments are directed to a receiver-decoder suitable for reception according to the method.

Abstract: Disclosed is a transmission method of transmitting at least one multicarrier signal made up of OFDM-OQAM symbols to a receive antenna of a receiver device, the transmission method being for use by a transmitter device having at least one transmit antenna. In one embodiment, the method comprises, for each transmit antenna of the transmitter device, filtering OFDM-OQAM symbols associated with the transmit antenna using a time-reversal prefilter defined from an estimate of the transmission channel between the transmit antenna and the receive antenna and transmitting the filtered OFDM-OQAM symbols via the transmit antenna over the transmission channel.

Abstract: The invention relates to a multiantenna radio communications method wherein frequency subbands Bsk, for k=1, . . . , P, are allocated respectively to P user antennas s1, . . . , sp belonging to one or more users, from within a total frequency bandwidth BT, and wherein at least one of the user antennas communicates with the base station over its respective frequency subband Bsk by means of a signal that has been filtered by time reversal. According to the invention, for at least one pair of user antennas Si and Sj, where and i,j=1, . . . , P and i?j, the respective frequency subbands Bsi and Bsj overlap by ?Bsi,sj, said overlap ?Bsi,sj being a predetermined function of the correlation between the respective propagation channels of these two user antennas with said base station.

Abstract: A method is provided for transmitting an information sequence from a source entity to a recipient entity, via at least one relay entity. The method includes: transmitting, by said source entity, modulated symbols representative of said information sequence, obtained after modulation of said information sequence, on a first channel, called ‘source’ modulated symbols; and transmitting, by said at least one relay entity, modulated symbols representative of said information sequence, obtained after modulation of an estimation of said information sequence on a second channel, called ‘relay’ modulated symbols, said first and second channels being orthogonal between each other. The source entity and the at least one relay entity simultaneously send at least one of said ‘source’ modulated symbols and at least one of said ‘relay’ modulated symbols.

Abstract: A method for transmitting a source binary sequence, including at least one source word, in a transmission channel. The method includes the following steps, for at least one source word: error-correcting encoding the source word, outputting a code word; matrix mapping the code word, distributing bits constituting the code word within at least two mapping matrices, which are reversible and observe a criterion of uniqueness in the cancellation of a syndrome associated with the code word; and consecutively transmitting the at least two mapping matrices.

Abstract: A method and apparatus are provided for reducing a channel length. The method implements a channel-length reduction filter that takes into account a pulse response of the channel. The method includes the following steps: cutting the filter into at least one first and one second portion; optimizing said first portion of the filter according to a first criterion in order to output a first set of filtering coefficients; reducing the length of the channel by optimizing said second portion of the filter according to a second criterion different from the first one and based on the first set of filtering coefficients of said first portion of the filter in order to output a second set of filtering coefficients.

Abstract: The invention relates to a multiantenna radio communications method wherein frequency subbands Bsk, for k=1, . . . , P, are allocated respectively to P user antennas s1, . . . , sP belonging to one or more users, from within a total frequency bandwidth BT, and wherein at least one of the user antennas communicates with the base station over its respective frequency subband Bsk by means of a signal that has been filtered by time reversal. According to the invention, for at least one pair of user antennas si and sj, where and i, j=1, . . . , P and i?j, the respective frequency subbands Bsi and Bsj overlap by ?Bsi,sj, said overlap ?Bsi,sj being a predetermined function of the correlation between the respective propagation channels of these two user antennas with said base station.

Abstract: A method for transmitting a source binary sequence, including at least one source word, in a transmission channel, The method includes the following steps, for at least one source word: error-correcting encoding the source word, outputting a code word; matrix mapping the code word, distributing bits constituting the code word within at least two mapping matrices, which are reversible and observe a criterion of uniqueness in the cancellation of a syndrome associated with the code word; and consecutively transmitting the at least two mapping matrices.

Abstract: A method and apparatus are provided for reducing a channel length. The method implements a channel-length reduction filter that takes into account a pulse response of the channel. The method includes the following steps: cutting the filter into at least one first and one second portion; optimizing said first portion of the filter according to a first criterion in order to output a first set of filtering coefficients; reducing the length of the channel by optimizing said second portion of the filter according to a second criterion different from the first one and based on the first set of filtering coefficients of said first portion of the filter in order to output a second set of filtering coefficients.

Abstract: A method is provided for transmitting a digital signal via n transmit antennas, wherein n is strictly greater than 2. The method includes combining with a source data vector n vectors to be transmitted respectively by each of the transmit antennas by a coding matrix <I>M</I> with a yield equal to 1, using reference symbols known to at least one receiver whereby it is able to estimate at least three transmission channels corresponding respectively to each of the transmit antennas. The coding matrix <I>M</I> applies a mathematical transformation to the reference symbols prior to the transmission thereof.

Abstract: The present invention relates to a transmission method and device suitable for a system using Nt transmit antennas TXi and Nr receive antennas RXj. The symbols transmitted are inserted in a time-frequency frame that contains a training sequence. Each training sequence is constructed from replicas of a basic training sequence. At least one of the training sequences includes at least two replicas at least one of which is phase offset.

Abstract: A method is provided for receiving a received data signal including at least one symbol block received and representative of a source signal. The method includes at least one iteration for improving an estimate of the received signal and including the following steps, for a current equalized symbol block: obtaining one or more decided bits, by bit-by-bit decoding a current subset of bits; updating one or more symbols, according to the decoded bit or bits, delivering an updated block of estimated symbols; determining a block of equalized symbols enhanced by canceling interferences, taking account of the updated block of estimated symbols.

Abstract: A method and a module for estimating transmission channels in a multi-antenna system. A matrix A is calculated which is constructed in the form of blocks from training sequences and an appropriate Fourier matrix. For a receive antenna RXj concerned, the method and the module calculate Nt impulse responses in the time domain by multiplying Np pilot symbols extracted from a frequency-domain signal Rj(n) obtained after demodulation of a time-domain signal received by the receive antenna RXj concerned by a product of matrices comprising the pseudo-inverse matrix of the product of the Hermitian matrix of the A matrix with the A matrix enabling decorrelation of modulated carriers adjacent null carriers.

Abstract: An embodiment of invention relates to a method for the transmission of a signal formed by vectors, each vector comprising N source symbols to be transmitted, using M transmission antennas, wherein M is greater than or equal to 2. The method comprises the following steps: linearly precoding the signal using a matrix product of a source matrix formed by vectors that are organized in successive lines by a linear precoding matrix, delivering a precoded matrix; and successively transmitting precoded vectors corresponding to columns of said precoded matrix, the M symbols of each precoded vector being distributed to the M antennas.

Abstract: The disclosure relates to a method for receiving a data signal by NR receiving antennas. The data signal undergoes, before transmission, a channel coding and is transmitted on NT antennas each transmitting a portion of this signal. Upon reception the transmission channel between the transmitting antennas and the receiving antennas is estimated. The method of the aforementioned type involves at least one iteration for improving an estimation of the received signal according to the received signal and involves a preceding estimation of said received signal, comprising the following steps: filtering this received signal; determining an interference affecting the received signal while furnishing an estimated interference; subtracting this estimated interference form the filtered signal whereby obtaining an improved signal; equalizing this improved signal and furnishing an equalized signal, and; estimating, from this equalized signal, the emitted data signal, called the estimated signal.

Abstract: An embodiment of the invention relates to a method for sending a signal formed by successive vectors each comprising N symbols to be sent, and implementing at least two transmitter antennas. A distinct sub-matrix is associated with each of said antennas, said sub-matrices being obtained by subdivision of a unitary square matrix, and each of said antennas sends sub-vectors, obtained by subdivision of said vectors, respectively multiplied by said sub-matrices so as to form, as seen from a receiver, a single combined signal representing the multiplication of said vectors by said unitary matrix.

Abstract: A method is provided for transmitting a digital signal via n transmit antennas, wherein n is strictly greater than 2. The method includes combining with a source data vector n vectors to be transmitted respectively by each of the transmit antennas by a coding matrix <I>M</I> with a yield equal to 1, using reference symbols known to at least one receiver whereby it is able to estimate at least three transmission channels corresponding respectively to each of the transmit antennas. The coding matrix <I>M</I> applies a mathematical transformation to the reference symbols prior to the transmission thereof.

Abstract: A method is provided for receiving a received data signal including at least one symbol block received and representative of a source signal. The method includes at least one iteration for improving an estimate of the received signal and including the following steps, for a current equalized symbol block: obtaining one or more decided bits, by bit-by-bit decoding a current subset of bits; updating one or more symbols, according to the decoded bit or bits, delivering an updated block of estimated symbols; determining a block of equalized symbols enhanced by canceling interferences, taking account of the updated block of estimated symbols.

Abstract: The disclosure relates to a method for decoding a received signal comprising symbols which are distributed in space and time with the aid of a space-time coding matrix, comprising a space-time decoding stage and at least two iterations, each of which comprising the following sub-stages: diversity pre-decoding, the opposite of diversity pre-decoding carried out when the signal is emitted, providing precoded data; estimation of symbols forming said signal on the basis of said pre-decoded data, providing estimated symbols; diversity preceding identical to diversity preceding carried out during emission, applied to the estimated symbols in order to provide an estimated signal.