University of Cambridge > > Computer Laboratory Systems Research Group Seminar > Coded Wireless Video Broadcast/Multicast - A Framework To Harvest The True Potential Of 4G Access Networks

Coded Wireless Video Broadcast/Multicast - A Framework To Harvest The True Potential Of 4G Access Networks

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Advancements in video coding and wireless communications, particularly in emerging 4G access networks, have created many foreseeable and exciting wireless video broadcast/multicast applications. Although using shared broadcast radio signals can nicely scale the system capacity regardless of the number of receivers, the rate is limited by the poorest-channel receiver for the largest scalability. This prohibits the true potential of any 4G access network to enable high-quality video broadcast, such as for high-definition TV content. For efficient and robust wireless video broadcast/multicast under fading, this talk presents a novel cross-layer framework that exploits the interplay between applying protections on any successively refinable video source and transmitting through a layered broadcast/multicast channel. It is achievable by using multiple descriptions coding on a scalable video source and using superposition coding for layered broadcast/multicast transmission. The results from both communication engineering and information-theoretical perspectives reveal the scenarios for the framework to lead to a lower distortion than a legacy system. Most importantly, this generic framework contributes to the advancement in the related research fields by introducing a new design dimension in terms of protection. It is unique when compared to all previous approaches that are often manipulating conventional parameters alone such as power and modulation scheme. The impact of this dimension was unapparent in the past, but is now proven as an effective means to enable high-quality, efficient, and robust wireless video broadcast/multicast in any 4G access network.

Bio: James She ( is currently a visiting Research Fellow in the Computer Laboratory at the University of Cambridge, UK. He completed his Ph.D. in Electrical and Computer Engineering from the University of Waterloo (UW), Canada, in August 2009. His research interests are in wireless multimedia delivery and sensing communications. His Ph.D. thesis on Coded Wireless Video Broadcast/Multicast received the funding supports from various provincial and national government/research agencies for prototyping and commercialization. During his Ph.D. study, he has generated 5 International, US, Taiwanese patents and authored/co-authored 20 publications. James also received his M.Phil. in Electrical and Computer Engineering from the Hong Kong University of Science and Technology, Hong Kong. Two US and Chinese patents resulted from his Master’s thesis were licensed to a startup company in video content delivery network – SinoCDN Limited (Hong Kong). From 2000-2003, James served as the Chief Technology Officer for SinoCDN Limited. He is a recipient of the honor of “Outstanding Achievement of Graduate Studies” awarded by UW and two Canadian national awards in 2009 – NSERC Postdoctoral Fellowship Award and NSERC Innovation Challenge Award (the 1st runner-up). In 2001, James was the youngest recipient, to-date, to be named one of “Ten Outstanding Young Digi-Persons” by the Innovation and Technology Association and the Information Technology Department, of the Government of Hong Kong. In addition, he received two Hong Kong Industry Awards with his patented technology. The same patents were acquired by a US firm in 2008.

This talk is part of the Computer Laboratory Systems Research Group Seminar series.

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