Pseudo-random turbo-codes

Convolutional codes with a distance distribution close to that obtained in the average by random coding are necessarily recursive. We introduce pseudo-random recursive (PRR) codes with a weight distribution which fits well that of random coding, at least in its central part. Decoding these codes is simple only if their free distance is low and thus, the error-event high. However, combining such codes according to the turbo-code scheme may be used to decrease the bit error rate to meet the user´s specification