Joint Iterative Source Channel Decoder for Video Transmitted Stream

H.264 is widely used in recently years and has achieved a significant improvement in coding efficiency. The entropy coding methods used in H.264 are CAVLC and CABAC. Although these two variable length code methods can achieve high compression, they are very sensitive to channel errors. In this paper, An iterative joint source channel decoder which combines the variable length code and low density parity check (LDPC) code in an iterative scheme is proposed to dealing with this sensitivity to channel errors and this joint source channel decoder is applied to the decoding of the motion vectors in H.264 coded video stream.. Although H.264 codec has proposed several error resilience methods, we believe this method could provide additional error resilience to H.264 stream. Experiment indicates that our IJSCD achieves significant improvement than a separate scheme.