France Telecom

Benoit Le Saux

Maryline Helard

Laurent Boher

Xenophon Doukopoulos

The present invention relates to a transmission method and device suitable for a system using Nt transmit antennas TXand Nr receive antennas RX. 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.

Transmission/reception methods and modules for a multiple-carrier multiple-antenna system using training sequences

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 RXconcerned, the method and the module calculate Nimpulse responses in the time domain by multiplying Npilot symbols extracted from a frequency-domain signal R(n) obtained after demodulation of a time-domain signal received by the receive antenna RXconcerned 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.

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Rennes, France

Benoit Le Saux