Fixed-Packet-Length transcoding for error resilient video transmission over WCDMA radio links

Robust video transmission over wireless channels is very critical, due to channel impairments and to their effect on the compressed bitstream. In order to improve error resilience and, consequently, the received video quality, a novel unequal error protection (UEP) technique (fixed-packet-length transcoding assisted UEP, FPT-UEP) is proposed in the paper, and applied to the case of MPEG-4 video transmission. The proposed scheme increases at the same time the error resilience and enables the application of unequal error protection in the case of coded sources with variable length packets and partitions. The technique is applied to the case of MPEG-4 video transmission over a WCDMA radio link. Simulation results show that a significant improvement in terms of PSNR and of subjective quality can be achieved with the proposed scheme compared to equal error protection.

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