Patent ID: 8279973
Filing Date: 2012-10-02
Classification: H04B,H04L

Abstract:
1. Space-time coding method for a UWB transmission system comprising two radiative elements, said method comprising coding a block of information symbols S=(σ 1 ,σ 2 ,σ 3 ,σ 4 ) belonging to a PPM modulation alphabet with an even number M of modulation positions, said alphabet being partitioned into first and second sub-alphabets corresponding to successive ranges of modulation positions, the symbols σ 1 ,σ 3 belonging to the first sub-alphabet and the symbols σ 2 ,σ 4 belonging to the second sub-alphabet, and coding said symbol block into a sequence of vectors, each vector being associated with a given use of the transmission channel and a given radiative element, the components of a vector being intended to modulate the position of a pulse UWB signal, each component corresponding to a PPM modulation position, wherein said vectors are obtained from elements of the matrix: one line of the matrix corresponding to one use of the transmission channel and one column of the matrix corresponding to one radiative element, the matrix C being defined within one permutation of its rows and/or its columns, Δ being a permutation of the PPM positions of said alphabet and Ω being a permutation of the PPM modulation positions of said second sub-alphabet.