基于多层LDPC的分布式视频编码

Decoding Multilevel LDPC in Distributed Video Coding

改进了基于多层低密度一致校验码(Multi-level LDPC)的分布式视频解码方法.逐层进行迭代译码,低层向高层传递译码软信息(似然比),迭代译码的内信息通过计算旁信息与码字之间欧氏距获得.相比传统的多级解码方式,提出的解码方式可以减少逐层硬判决带来的信息丢失,从而减小低层向高层的错误传播,更适合于视频数据的Syndrome编码.实验结果表明,该解码方式能提高分布式视频中多层码的解码成功率,从而提高编码效率.

An improved algorithm for decoding multilevel LDPC in distributed video coding （DVC） is presented. Multilevel LDPC is decoded level by level, and soft-decision results are passed from lower levels to higher levels. The intrinsic information is obtained by calculating the Euclidean distance between the side information and the candidate codewords. Passing soft-decision results can prevent error propagation, so it＇s more suitable for non-binary syndrome coding. The simulation results show that the proposed scheme can improve the efficiency of distributed video coding.