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Event Information Booz Allen Hamilton Colloquium: "Cross-Layer Wireless Video Transmission" Friday, September 14, 2012 3:00 p.m. 1110 Jeong H. Kim Engineering Bldg. For More Information: Carrie Hilmer 301 405 4471 chilmer@umd.edu http://ece.umd.edu/colloquium Booz Allen Hamilton Distinguished Colloquium in Electrical and Computer Engineering "Cross-Layer Wireless Video Transmission Using Packet Visibility Scores" Professor Pamela Cosman Professor & Vice Chair of Electrical and Computer Engineering University of California, San Diego Abstract: The packets composing a compressed video bitstream do not all have the same visual importance for the final reconstructed video. So, when video is to be compressed and transmitted over a noisy channel, the packets should be unequally protected against errors. In this talk, I will first describe our human observer experiments for determining the visual importance of different packets in the video stream. Based on the human observer data, we construct a computational packet visibility score. I will describe several uses of this score in cross-layer video communications. For congested routers, the visual importance score can be used to decide which packets should be dropped to cause least damage to the video stream. For wireless transmission, importance scores can be useful to determine unequal levels of forward error correction for the packets. In the case where instantaneous channel state information is known, we optimize the mapping of video packets to subcarriers within a time-frequency resource block, in order to better protect more visually important packets by transmitting them on more reliable subcarriers. Biography: Pamela Cosman obtained her B.S. in EE from Caltech in 1987, and her Ph.D. in EE from Stanford University in 1993. After a postdoc at the University of Minnesota, she joined in 1995 the faculty of Electrical and Computer Engineering at the University of California, San Diego, where she is currently a Professor and Vice-Chair. She was the Director of the Center for Wireless Communications from 2006 to 2008. Her research interests are in the areas of image and video compression and processing, and wireless communications. She was an associate editor of the IEEE Communications Letters and the IEEE Signal Processing Letters, and was the Editor-in-Chief (2006-2009) as well as a Senior Editor of the IEEE Journal on Selected Areas in Communications. She is a member of Tau Beta Pi and Sigma Xi, and a Fellow of the IEEE. This Event is For: Clark School • Graduate • Undergraduate • Faculty • Post-Docs

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