Computer Science – Information Theory
Scientific paper
2011-09-04
Computer Science
Information Theory
11 pages, 6 figures, 1 table. To be presented at ITW 2011
Scientific paper
Recent results on source-channel coding for secure transmission show that separation holds in several cases under some less-noisy conditions. However, it has also been proved through a simple counterexample that pure analog schemes can be optimal and hence outperform digital ones. According to these observations and assuming matched-bandwidth, we present a novel hybrid digital/analog scheme that aims to gather the advantages of both digital and analog ones. In the quadratic Gaussian setup when side information is only present at the eavesdropper, this strategy is proved to be optimal. Furthermore, it outperforms both digital and analog schemes and cannot be achieved via time-sharing. An application example to binary symmetric sources with side information is also investigated.
Piantanida Pablo
Shamai Shlomo
Villard Joffrey
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