Rate-Distortion Optimized Cross-Layer Rate Control in Wireless Video Communication
A wireless video communication system can be designed based on the Rate-Distortion (R-D) criterion, i.e., minimizing the end-to-end distortion (which includes quantization distortion and transmission distortion) subject to the transmission bit-rate constraint. The minimization can be achieved by adjusting the source encoding parameters and channel encoding parameters. This R-D Optimization (RDO) is usually done for each video frame individually in a real-time video communication system, e.g. video calls or videoconferencing. To achieve this, an accurate bit-rate model and distortion model for each frame can be used to reduce the RDO complexity.