Abstract: In order to evaluate the noise related to data issuing from a turbo-encoder, estimates of the noise related to its systematic output, to the data issuing from its first elementary encoder, and to the data issuing from its second elementary encoder are determined. At least two of the estimates of the noise related to the systematic output, to the data issuing from the first encoder, and to the data issuing from the second encoder, are added. The results of these additions are divided by the number of augends added, and then inverted, so as to obtain a noise factor, and the noise factor is multiplied with the data issuing from at least one of the first encoder, second encoder, and systematic output.

Abstract: An original information sequence is encoded by a use of an error correcting code. There is associated with the encoded sequence K frequency symbols in a space consisting of a series of 2p increasing frequencies, each of the K symbols representing N encoded symbols, with p, K and N being strictly positive integers. There is applied to the K symbols a reversible transformation including a multiplication by an invertible matrix of size N×N, and signals obtained from the inverse transform signals are sent. There exists a K-tuplet of positive integers n1, n2, . . . , nk at least one of which is strictly positive, such that, for an integer I varying from 1 to K, after periodic extraction of one frequency out of 2ni among the frequencies of the ith of the K symbols, thus forming a reduced frequency symbol of 2p?ni frequencies, K reduced frequency symbols are obtained, representing the original information sequence, with a view to complete or partial decoding.

Abstract: In order to evaluate the noise related to data issuing from a turbo-encoder: estimates of the noise related to its systematic output, to the data issuing from its first elementary encoder and to the data issuing from its second elementary encoder are determined (70); at least two of the estimates of the noise related to the systematic output, to the data issuing from the first encoder, and to the data issuing from the second encoder, are added (72); the results of these additions are divided (74) by the number of augends added, and then inverted (76), so as to obtain a noise factor; and the noise factor is multiplied with the data issuing from at least one of the first encoder, second encoder and systematic output.

Abstract: In order to evaluate the noise related to data issuing from a turbo-encoder, estimates of the noise related to its systematic output, to the data issuing from its first elementary encoder, and to the data issuing from its second elementary encoder are determined. At least two of the estimates of the noise related to the systematic output, to the data issuing from the first encoder, and to the data issuing from the second encoder, are added. The results of these additions are divided by the number of augends added, and then inverted, so as to obtain a noise factor, and the noise factor is multiplied with the data issuing from at least one of the first encoder, second encoder, and systematic output.

Abstract: An original information sequence is encoded (E1) by means of an error correcting code; there is associated (E2) with the encoded sequence K frequency symbols in a space consisting of a series of 2p increasing frequencies, each of the K symbols representing N encoded symbols, p, K and N being strictly positive integers; there is applied (E3) to the K symbols a reversible transformation including a multiplication by an invertible matrix of size N×N; and signals obtained from the inverse transform signals are sent (E4). There exists a K-tuplet of positive integers n1, n2, . . . , nK at least one of which is strictly positive, such that, for an integer i varying from 1 to K, after periodic extraction of one frequency out of 2ni amongst the frequencies of the ith of the K symbols, thus forming a reduced frequency symbol with 2p-ni frequencies, K reduced frequency symbols are obtained, representing the original information sequence, with a view to complete or partial decoding.

Abstract: In order to evaluate the noise related to data issuing from a turbo encoder: estimates of the noise related to its systematic output, to the data issuing from its first elementary encoder and to the data issuing from its second elementary encoder are determined (70); at least two of the estimates of the noise related to the systematic output, to the data issuing from the first encoder, and to the data issuing from the second encoder, are added (72); the results of these additions are divided (74) by the number of augends added, and then inverted (76), so as to obtain a noise factor; and the noise factor is multiplied with the data issuing from at least one of the first encoder, second encoder and systematic output.