Turbo decoder and dynamic decoding method used for same

摘要

A turbo decoding method capable of significantly improving efficiency of a determination as to whether or not to end decoding is suggested. If the decoding by a turbo decoder is started, a soft decision value of an element decoder is derived, and an ECR (Estimated Correct Ratio) of a current frame is estimated from the soft decision value by an ECR criterion deriving portion. If the end is determined as a result of an end determination of decoding by the turbo decoder from a result of comparison with a last ECR value and the maximum number of times of repetition of decoding, a hard decision result and a decoding result are outputted, and if no end is determined, the number of times of repetition is counted up so as to repeat the above process.