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Achievable Rates for Multiple Descriptions With Feed-Forward

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2 Author(s)

The two-channel multiple descriptions problem for an independent and identically distributed (i.i.d.) source, with feed-forward to one or both side-decoders is considered. A single-letter achievable rate-region is derived; it enlarges the best known rate-region for multiple descriptions without feed-forward. The proof of the result uses a block-Markov superposition source coding strategy. In point-to-point source coding, feed-forward does not decrease the rate-distortion function of an i.i.d. source. In contrast, an example is provided to show that the derived region can be strictly larger than the optimal multiple description rate-distortion region without feed-forward.

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Information Theory, IEEE Transactions on  (Volume:57 ,  Issue: 4 )