Method and a device for increasing the amount of information bits comprised in a symbol

摘要

A method for increasing the amount of information bits comprised in a symbol transferred by a source to at least one receiver. The symbol is representative of a modulated base sequence obtained by encoding a sequence of base bits selected by the source and by modulating the encoded selected sequence. The modulated base sequence has fixed points. The source encodes the selected sequence of base bits and a sequence of supplementary bits, obtains a modulated base sequence by modulating the encoded selected sequence of base bits, obtains a modulated altering sequence by modulating the sequence of supplementary bits, alters the modulated base sequence by modifying at least a part of the values of its fixed points using the modulated altering sequence in order to obtain a modulated altered sequence, and transfers the modulated altered sequence under the form of an altered symbol.

主权项

1. A method for increasing the amount of information bits comprised in a symbol transferred by a source to at least one receiver, wherein the symbol is representative of a modulated base sequence obtained by encoding a sequence of base bits selected by the source among a plurality of possible sequences of base bits and by modulating the encoded selected sequence, each of the possible modulated base sequences that can be obtained from the possible sequences of base bits having fixed points, a fixed point having a same predetermined position within each modulated base sequence and having the same value within each modulated base sequence, the method comprising:
encoding the selected sequence of base bits using an error correction code; encoding a sequence of supplementary bits using an error correcting code; obtaining a modulated base sequence by modulating the encoded selected sequence of base bits; obtaining a modulated altering sequence by modulating the sequence of supplementary bits, the modulated altering sequence having a length inferior or equal to the number of fixed points of the modulated base sequence; altering the modulated base sequence by modifying at least a part of the values of its fixed points using the modulated altering sequence in order to obtain a modulated altered sequence; and transferring the modulated altered sequence under the form of an altered symbol.