Rate-Based versus Distortion-Based Optimal Joint Source-Channel Coding

- 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 ...

• Type: Conference
• Year: 2002
• Where: DCC
• Authors: Raouf Hamzaoui, Vladimir Stankovic
• Keywords: Computer Graphics, DCC 2002, Distortion-based Optimal Solution, Optimal Solution, Rate-based Optimal Solution