Distortion control for delay-sensitive sources

Citació

  • Faridi A, Ephremides A. Distortion control for delay-sensitive sources. IEEE Trans. Inf. Theory. 2008; 54(8): 3399-3411. DOI 10.1109/TIT.2008.926338

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Descripció

  • Resum

    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.
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