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Data Compression Conference (DCC '04)   p. 122
On Optimal Multiresolution Source-Channel Coding across Degraded Broadcast Channels
Ertem Tuncel, University of California, Riverside

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DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/DCC.2004.1281457
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Abstract
Inspired by a converse result, the concept of "probabilistically matched" sources and channels is extended to sources subject to multiresolution coding and degraded broadcast channels. Unlike in the point-to-point communication scenarios, however, due to the lack of a separation principle or a complete characterization for achievable cost-distortion triplets, matching of the source and the channel constitutes only a sufficient condition for optimality.
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Citation:  Ertem Tuncel, "On Optimal Multiresolution Source-Channel Coding across Degraded Broadcast Channels," dcc, p. 122,  Data Compression Conference (DCC '04),  2004