Patent ID: 6898251

Claim:
A method of evaluating noise related to data streams issuing from a turbo-encoder having at least first and second encoders, the data streams being intended for a turbodecoder having at least first and second elementary decoders, according to which: an operation of estimating the noise is performed, including determining an estimate of a noise related to a systematic output of the turbo-encoder, an estimate of a noise related to the data stream issuing from the first encoder, and an estimate of a noise related to a data stream issuing from the second encoder, said method including steps according to which the following operations are performed: an addition operation, of adding at least two of the estimate of the noise related to the systematic output, the estimate of the noise related to the data stream issuing from the first encoder, and the estimate of the noise related to the data stream issuing from the second encoder; a division operation, of dividing a result of said addition operation by a number of augends added in said addition operation; an inversion operation, of determining an inverse of a result of said division operation as a noise factor; and a multiplication operation, of multiplying the noise factor with the data stream(s) issuing from at least one of the first encoder, the second encoder, and the systematic output.