France Telecom

Pierre-Jean Bouvet

Maryline Helard

Vincent Le Nir

Jean-Philippe Javaudin

Rodolphe Le Gouable

A method and apparatus are provided for coding an OFDM/OQAM-type multi-carrier signal formed by a temporal succession of symbols comprising a set of data elements. Each of the data elements modulates a carrier frequency of the signal. Each of the data elements is formed by adding two real values in quadrature, which each correspond to a binary word of a source signal, which is modulated using a pre-determined modulation constellation, such as to transmit information over a real channel and an imaginary channel of the OFDM/OQAM symbols.

Method for the coding of an OFDM/OQAM signal using symbols with complex values, and corresponding signal, devices and computer programs

The disclosure relates to a method for receiving a data signal by Nreceiving antennas. The data signal undergoes, before transmission, a channel coding and is transmitted on Nantennas 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.

Iterative receiving method for a MIMO system, and corresponding receiver and computer program

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.

Receiver and method for decoding a coded signal with the aid of a space-time coding matrix

A method for the reception of a data signal which, before being sent, has undergone a linear precoding by means of a unitary preceding matrix, and a channel coding, comprises at least one iteration to improve an estimation of the received signal, as a function of the received signal and of a preceding estimation of the received signal. This iteration comprises the following steps: the estimation of the interference due especially to the linear precoding and affecting the received signal, as a function of the preceding estimation, so as to obtain an estimated interference; the subtraction of the estimated interference from the preliminarily filtered and de-precoded received signal, so as to obtain an improved signal; the equalization of the improved signal, delivering an equalized signal; the estimation of the received signal, delivering an estimation of the received signal.

Method for the reception of a signal that has undergone a linear precoding and a channel coding, corresponding reception device and computer program product

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Rennes, France

Pierre-Jean Bouvet