Method of space time coding with low papr for multiple antenna communication system of the UWB pulse type

UWB transmission system comprising:

• a plurality of radiative elements;
• coding means to code a block of information symbols S=(σ1, σ2, . . . , σP) belonging to a M-PPM-M′-PAM modulation alphabet with M≧2, as a sequence of vectors, each vector being associated with a given use of the transmission channel and a radiative element, each component of a vector corresponding to a PPM modulation position, said vectors being 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 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±);
• a plurality of modulators to position and amplitude modulate a pulse UWB signal, each modulator being associated with a radiative element and position and amplitude modulating said signal, during a use of the transmission channel, by the components of the vector associated with said radiative element and said use of the channel;
• each radiative element being adapted to emit the signal thereby modulated by said associated modulator.