For its error correction performance extremely close to the shannon limit , from the beginning , turbo codes attracts the eyes of enormous professionals and researchers . in turn , it is called the greatest contribution after ungerboeck ' s trellis coded modulation ( tcm ) 因为它具有极其逼近香农极限的纠错性能,从一开始turbo码便吸引了通信领域无数专家学者的关注与研究,进而被誉为继ungerboeck提出格状编码调制( tcm )以来,信道编码领域最伟大的贡献。