Parallel complementary decoding based on OSD and Chase

Ordered Statistic Decoding(OSD) algorithm and Chase algorithm are investigated in this paper,based on which,a new Chase-OSD parallel decoding algorithm for medium and short lengths Low Density Parity-Check(LDPC) codes is proposed.Chasetype decoding algorithm is based on processing certain LRPs of a received sequence,while OSD algorithm is based on processing certain MRIPs of a received sequence.If there are too many errors in MRIPs,the OSD algorithm will fail,while there are too much errors in LRPs,the Chase-type algorithm will fail.A parallel concatenation decoding algorithm is proposed based on that complementary characteristic.The simulation results show that the proposed algorithm is effective.The decoding performance is improved compared with BP-OSD and BP-Chase algorithm.