Wyner-Ziv encoded predictive multiple descriptions
The predictive multiple description coding problem can be posed as a variant of the well-known Wyner-Ziv side-information problem. Predictive MD coding in this framework (termed the WYZE-PMD) eliminates the problem of predictive mismatch without requiring restrictive channel assumptions or high latency. The performance of two-channel one-step predictive MD coding was analyzed within the WYZE-PMD framework. Achievable rate-distortion (R-D) regions were obtained for the problem of MD coding in the presence of correlated decoder side-information. These were used to obtain the operational R-D performance for predictive MD coding under certain restrictions. Practical code constructions were proposed within the WYZE-PMD framework. Performance comparisons between the proposed codes and conventional approaches were presented for communication of a first-order Gauss-Markov source over two erasure channels with independent failure probabilities. Results indicated that the proposed approach significantly out-performs conventional approaches in terms of R-D performance.