Method for transmitting non binary error correcting code words with CCSK modulation, and corresponding signal and device

A transmitter capable of transmitting symbols of non-binary error-correcting code words via a single carrier system, each code word symbol comprising p bits, wherein p is an integer greater than 0, said transmitter comprising:

• a first modulator associating each p-bit code word symbol with a sequence of at least 2p chips selected from a set of 2p sequences,
• a second modulator to modulate a phase or amplitude of a single carrier signal with sequences associated with the non-binary error-correcting code words and generate modulated symbols having a size equal to a size of the sequences associated with the non-binary error-correcting code words, and
• a transmitter circuit capable of transmitting the modulated single carrier signal via said transmission channel,
• wherein the first modulator is a spread spectrum modulator of a cyclic code-shift keying type using a basic pseudo-random sequence of at least 2p chips, the 2p possible sequences being obtained by a circular shift of the basic pseudo-random sequence, and
• wherein the transmitter further comprises a circuit capable of inserting a cyclic prefix into each modulated sequence.

A receiver comprising:

• a receiver circuit capable of receiving a transmitted non-binary error-correcting code words transmitted on a single carrier signal, wherein each non-binary error-correcting code word symbol comprising p bits, wherein p is an integer greater than 0, the modulated single carrier signal carrying modulated sequences each comprising a cyclic prefix and modulated symbols having a size equal to a size of sequences of at least 2p chips selected from a set of 2p sequences, the modulated symbols being generated by a phase or amplitude modulation of at least one carrier signal with the sequences of at least 2p chips, each p-bit non-binary code word symbol being associated with a sequence of the set of 2p sequences by a spread spectrum modulation of a cyclic code-shift type using a basic pseudo-random sequence of at least 2p chips, the 2p sequences being obtained by a circular shift of the basic pseudo-random sequence,
• a circuit capable of deleting the cyclic prefix from each modulated sequence,
• a circuit capable of fast Fourier transform of the received signal in order to generate samples in a frequency domain, and
• a circuit capable of jointly performing frequency equalization and calculation of log-likelihood ratio values for said samples.