Patent ID: 8218670

Claim:
Method of space time coding for UWB transmission system comprising a plurality P of radiative elements, said method comprising: coding a block of information symbols S=(σ 1 ,σ 2 , . . . ,σ P ) belonging to a M-PPM-M′-PAM modulation alphabet with M≧2, as a sequence of vectors, the components of a vector being intended to position and amplitude modulate a pulse UWB signal for a given radiative element of said system and a use of transmission channel, each component of a vector corresponding to a PPM modulation position, characterised in that said vectors are obtained from elements of the matrix: C = ( σ 1 σ 2 … σ P Ωσ P σ 1 ⋱ ⋮ ⋮ ⋱ ⋱ σ 2 Ωσ 2 … Ωσ P σ 1 ) a row of the matrix corresponding to a use of the transmission channel and a column of the matrix corresponding to a radiative element, the matrix C being defined to within a permutation of its rows and/or its columns and Ω being defined as the combination of a permutation (ω) of the modulation positions of the M-PPM alphabet and a symmetry operation (π) of the M-PAM modulation alphabet for one of the modulation positions (m ± ).