We present and compare several video transmission systems with various feedback and coding strategies for wireless real-time transmission. A channel coding system based on high-memory convolutional codes (CCs) is deployed which aims at delaying the first error within a progressively coded data frame as far as possible. A low-rate feedback channel is introduced to communicate the number of error-free received bits to the transmitter or to request additional redundancy. Thus, drift problems are avoided, since video encoder and decoder predict from identical reference frames. Several video communication systems based on forward error correction (FEC) and automatic repeat request (ARQ) methods are presented and compared. Experimental results are provided. The benefits of the proposed combination of unequal error protection (UEP) or ARQ systems with progressively coded sources and network feedback are highlighted.
['Thomas Stockhammer', 'Hrvoje Jenkac', 'Carolin Weiss']
Error control for wireless progressive video transmission