Resilient Delivery Of MPEG-II Over Noisy Wireless ATM Channels

WIRELESS ATM CHANNELS Robert Swann and Nick Kingsbury Cambridge University Engineering Department Trumpington Street, Cambridge CB2 1PZ. U.K. e-mail: rems1@eng.cam.ac.uk and ngk@eng.cam.ac.uk We consider the performance of MPEG-II compressed video when transmitted over noisy wireless ATM channels, such as for mobile digital video. We propose techniques for substantially improving the resilience of MPEG-II to cell losses without the addition of any redundancy. The massive growth in telecommunications during the last few years has created a demand for many video services. These services are only viable with substantial video compression. Whereas existing video standards such as MPEGII[1] facilitate the transmission of high quality video over error-free channels, they tend to su er greatly from error propagation e ects when transmitted over noisy ATM channels. The noise performance of MPEG-II over wireless ATM channels can be improved using forward error correction[2]. However, these techniques add redundancy thereby lowering the coding e ciency. Instead we consider the lossless `black box' approach of gure 1 where MPEG-II data is transcoded into a more resilient structure, transmitted, and nally recoded to be read by an MPEG-II decoder. The `black box' is lossless, and does not signi cantly alter the bit-rate, while providing substantial resilience to errors.