Hybrid coding for Gaussian broadcast channels with Gaussian sources

Authors:
Rajiv Soundararajan;Sriram Vishwanath
Affiliations:
Department of Electrical & Computer Engineering, University of Texas at Austin, Austin, TX;Department of Electrical & Computer Engineering, University of Texas at Austin, Austin, TX
Venue:
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 4
Year:
2009

Citing 6
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Abstract

This paper considers a degraded Gaussian broadcast channel over which Gaussian sources are to be communicated. When the sources are independent, this paper shows that hybrid coding achieves the optimal distortion region, the same as that of separate source and channel coding. It also shows that uncoded transmission is not optimal for this setting. For correlated sources, the paper shows that a hybrid coding strategy has a better distortion region than separate source-channel coding below a certain signal to noise ratio threshold. Thus, hybrid coding is a good choice for Gaussian broadcast channels with correlated Gaussian sources.