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Distortion Control for Delay-Sensitive Sources

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2 Author(s)
Faridi, A. ; Dept. of Inf. & Commun. Technol., Univ. Pompeu Fabra, Barcelona ; Ephremides, Anthony

We investigate the problem of finding minimum-distortion policies for streaming delay-sensitive but distortion-tolerant data. We consider cross-layer approaches which exploit the coupling between presentation and transport layers. We make the natural assumption that the distortion function is convex and decreasing. We focus on a single source-destination pair and analytically find the optimum transmission policy when the transmission is done over an error-free channel. This optimum policy turns out to be independent of the exact form of the convex and decreasing distortion function. Then, for a packet-erasure channel, we analytically find the optimum open-loop transmission policy, which is also independent of the form of the convex distortion function. We then find computationally efficient closed-loop heuristic policies and show, through numerical evaluation, that they outperform the open-loop policy and have near optimal performance.

Published in:

Information Theory, IEEE Transactions on  (Volume:54 ,  Issue: 8 )