Patent ID: 7769072

Claim:
A learning process for an ultra wideband communication system including a transmission apparatus and a reception apparatus, the transmission apparatus including M (M≧2) emission antennas and the reception apparatus including N (N>1) reception antennas, wherein information is modulated on L possible positions, comprising: a) transmitting, at the transmitting apparatus, a series of N seq learning pulses from each emission antenna to all reception antennas at the reception apparatus, wherein the transmitting includes generating each series of pulses emitted by an emission antenna from a term by term product for a known sequence common to all emission antennas and a parity code (c k (i) ) (k=1,2, . . . N seq ) specific to each emission antenna i, the parity codes being orthogonal to each other in pair; b) estimating, at each reception apparatus j, M composite responses (h 1 (i,j) ,h 2 (i,j) , . . . ,h Nech (i,j) ) of series of emitted pulses that arrive at this reception antenna j, each response being equal to a convolution of the series of learning pulses emitted with a propagation channel transfer function from the emission antenna i to the reception antenna j, each composite response being estimated by eliminating effects of other antennas; and c) estimating, at the reception apparatus, correlations (R) between different channels.