Strathprints Home | Open Access | Browse | Search | User area | Copyright | Help | Library Home | SUPrimo

Rate-based versus distortion-based optimal joint source-channel coding

Hamzaoui, R. and Stankovic, V. and Xiong, Z.X. (2002) Rate-based versus distortion-based optimal joint source-channel coding. In: Data Compression Conference (DCC 2002), 2002-04-02 - 2002-04-04, Snowbird.

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

We consider a joint source-channel coding system that protects an embedded wavelet bitstream against noise using a finite family of channel codes with error detection and error correction capability. The performance of this system may be measured by the expected distortion or by the expected number of correctly received source bits subject to a target total transmission rate. Whereas a rate-based optimal solution can be found in linear time, the computation of a distortion-based optimal solution is prohibitive. Under the assumption of the convexity of the operational distortion-rate function of the source coder, we give a lower bound on the expected distortion of a distortion-based optimal solution that depends only on a rate-based optimal solution. Then we show that a distortion-based optimal solution provides a stronger error protection than a rate-based optimal solution and exploit this result to reduce the time complexity of the distortion-based optimization. Finally, we propose a fast iterative improvement algorithm that starts from a rate-based optimal solution and converges to a local minimum of the expected distortion. Experimental results for a binary symmetric channel with the SPIHT coder and JPEG 2000 show that our lower bound is close to optimal. Moreover, the solution given by our local search algorithm has about the same quality as a distortion-based optimal solution, whereas its complexity is much lower than that of the previous best solution.

Item type: Conference or Workshop Item (Paper)
ID code: 38556
Keywords: progressive transmission, noisy channels, rate-based, distortion-based, optimal joint , source-channel coding, Electrical engineering. Electronics Nuclear engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 19 Mar 2012 15:57
    Last modified: 17 Jul 2013 15:30
    URI: http://strathprints.strath.ac.uk/id/eprint/38556

    Actions (login required)

    View Item