Patent ID: 7945005

Claim:
A method of estimating transmission channels in a receiver of a multi-antenna system including N t send antennas, where N t is greater than or equal to 2, and at least one receive antenna, wherein a time-frequency frame for each send antenna comprises pilot symbols forming a training sequence and data symbols of a payload signal, the N t training sequences, time-shifted relative to each other, being known to the receiver and enabling the receiver to estimate N t impulse responses corresponding to the N t transmission channels between one of the send antennas and the respective receive antenna RX j , the data symbols and the pilot symbols being frequency-modulated by an orthogonal multiplexer to form orthogonal symbols that are sent by the send antennas in the form of a multi-carrier signal with N FFT carriers including N p pilot carriers and null carriers, the method comprising: a step of calculating a matrix A constructed in the form of blocks from the training sequences and from a Fourier matrix with dimensions N FFT ×N FFT ; wherein for a particular receive antenna RX j , the method comprises a step of calculating the N t impulse responses in a time domain by multiplying N p pilot symbols extracted from a frequency-domain signal R j (n) obtained after demodulation of a time-domain signal received by the particular receive antenna RX j by means of an FFT of size N FFT 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.