Distortion Control for Delay-Sensitive Sources

TitleDistortion Control for Delay-Sensitive Sources
Publication TypeJournal Article
Year of Publication2008
AuthorsFaridi, A., & Ephremides A.
JournalIEEE Transactions on Information Theory
Date Published08/2008
Keywordsdelay-sensitive, distortion, scheduling, sourcecoding, streaming.

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.

Refereed DesignationRefereed