Transceiving system using a joined linear orthogonal modulation
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsYoann Roth, Vincent Berg, Jean-Baptiste Dore, Laurent Ros
Life of this patent
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Abstract
A transceiving system using a joined modulation alphabet A having a size M the symbols of which are distributed on a plurality N of orthogonal dimensions, the symbols carried by a dimension belonging to a linear sub-alphabet An having a size P, with M=NP. The transmitter performs a turbocoding of a block of information bits, the code words provided by the turbocoder being mapped to symbols of the joined modulation alphabet before modulating the signal to be transmitted. The receiver performs turbodecoding from the projection of the symbols received on the orthogonal dimensions of the alphabet.
Claims17
A transmitter for transmitting a block of Q bits, said transmitter comprising a turbocoder receiving said block and providing K code words having m bits, the turbocoder comprising K branches, each branch receiving said block and comprising a first interleaver for interleaving the bits of the block, followed by an elementary coder coding each word having r bits at an output of the first interleaver into a code word having m=r+c bits where c is a non-null integer, the turbocoder being followed by a modulator mapping each code word having m bits at an output of the turbocoder into a symbol of a modulation alphabet A having a size M=2m, the symbols of the modulation alphabet provided by the modulator that modulates the symbols to a signal to be transmitted, wherein the symbols of the modulation alphabet A are distributed on a plurality N of orthogonal dimensions, the symbols carried by a dimension belonging to a linear sub-alphabet An, having a size P>1, with M=NP, wherein m, O, M, N, and P are integer values.
Dependencies are inferred from the claim text.