| 摘要 |
This invention relates to a distributed space-time coding method for a UWB pulse telecommunication system wherein a source terminal transmits a signal to a destination terminal during a transmission interval constituted by K frames, K>=1, each frame being divided into a first and a second half-frame, the signal transmitted in each first half-frame being received, then retransmitted after amplification during the next second half-frame by a distinct relay terminal among K relay terminals of said system. The source terminal codes 4K data symbols belonging to a PPM modulation alphabet or a composite PPM-PAM modulation alphabet including a plurality of time positions, to provide a sequence of four transmission symbols per frame, said transmission symbols being obtained from 4K linear combinations of said data symbols using a plurality of coefficients belonging to a real algebraic extension of degree 2K of the field of rational numbers and, for one of said transmission symbols, a permutation of its PPM components. The transmission symbols thus obtained modulate a UWB pulse signal.
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