| 摘要 |
<p>The present invention relates to a method of spatio-temporal coding for UWB transmission system comprising two radiative elements. This method codes a block of information symbols (S=(a<SUB>1</SUB>, a<SUB>2</SUB>, a<SUB>3</SUB>, a<SUB>4</SUB>)) belonging to a PPM modulation constellation or PPM-PAM composite modulation constellation exhibiting a number of time positions that is greater than or equal to 3, as a sequence of vectors formula (I), the components of a vector being intended to modulate a pulsed UWB signal for a radiative element of said system and for a given transmission interval (Tf). A first and a second of said vectors are obtained by means of a first linear combination of a first and of a second pair of said symbols and a third and a fourth of said vectors are obtained by means of a second linear combination of said first and second pairs of said symbols, the first and second linear combinations using scalar coefficients formula (II) whose respective ratios are substantially equal to the number of gold and to its opposite, one of said vectors moreover undergoing a circular permutation of its components before modulating said pulsed UWB signal.</p> |
