Turbo code

Abstract

International audienceTurbo codes are error-correcting codes with performance close to the Shannon theoretical limit [SHA]. These codes have been invented at ENST Bretagne (now TELECOM Bretagne), France, in the beginning of the 90's [BER]. The encoder is formed by the parallel concatenation of two convolutional codes separated by an interleaver or permuter. An iterative process through the two corresponding decoders is used to decode the data received from the channel. Each elementary decoder passes to the other soft (probabilistic) information about each bit of the sequence to decode. This soft information, called extrinsic information, is updated at each iteration