Itu-t G.975.1 Efec Algorithm Realization

With the optical transmission techinque developing into longer distance and higher speed,the the need of Super FEC technique with higher coding gain is more and more。EFEC(Enhance Forward Error Correction)sometimes called Super FEC improved on the Reed-Solomon(255,239),using FEC coding method and then possessing enhanced correcting capability, coming into people's eyes。The more hotter Super FEC techniques under researching are RS(255,239)+ RS(255,223),RS (255,239)+CSOC(Convolu-tional Self-Orthogonal Code),RS(1023,1007)+BCH(2047,1952),BTC (Block turbo codes) and LDPC code。Super FEC technique as one of the overtake Sunday run optical transmission system's technique is at abroad using today。This paper focus on the following parts:Logically implementing the EFEC algorithm and BCH interleaving scheme;carried out the BCH coding and decoding that based on Berlekamp algorithm。Successful worked out the element operation in special field and polynomial iterative calculating that using Galois Field elements as the coefficient,and then made the correcting capbality of the BM algorithm reaches the code's capbality。This paper alse do some research on the LDPC code and carried ou the LDPC coding based on near down triangle matrix algorithm。...