Analysis of Error-resilient Video Transmission Based on Systematic Source-channel Coding

This paper discusses the modeling and analysis of a systematic lossy source channel coding system for errorresilient video transmission. The systematic portion of the transmission consists of a video bitstream transmitted without channel coding over an error-prone channel. Error-resilience is achieved by transmitting a supplementary bitstream generated by Wyner-Ziv encoding of the video signal. The scheme is attractive because it provides gracefully decreasing video quality over a range of symbol error rates, when compared with conventional FEC. We propose a model for the endto-end video distortion delivered by this system. The model considers the encoder’s rate-distortion trade-off, quantization mismatch from Wyner-Ziv coding, previous frame error concealment and error propagation. The model predictions agree closely with experimental results and thereby suggest an optimization algorithm to find the best rate-distortion tradeoff for systematic lossy forward error protection of video waveforms.