Robust Subband Video Coding with Leaky Prediction

The use of leaky prediction in a video transmission system designed for noisy channels is investigated. For the proposed system, graceful degradation is achieved by finding good index maps between the quantized source coder parameters and the amplitude levels of a QAM signal constellation. The contribution of this paper, however, is to investigate the use of leaky prediction to further increase the robustness to channel noise. It is shown that by using a temporal prediction coefficient slightly less than one, large improvements can be achieved with only a small degradation for the noiseless case. The performance of the proposed system is comparable to a reference system based on the H.263 video coder for high CSNR values, and degrades far more gracefully for low CSNR values. 1. INTRODUCTION Recently, there has been much interest in combined source coding and channel coding /modulation for transmission over noisy channels. In [1], the index assignment problem was addressed by using si..