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TITLE: Low-Delay Error Correction Codes for Streaming Media over Wireless Links
SPEAKER: Ashish Khisti (Deutsche Telekom Labs, Los Altos)
DATE: 2:00 - 3:00 PM, Wednesday, July 29, 2009
LOCATION: Pavilion, 4U
ABSTRACT:
Content is king! The recent surge of smart-phones, capable of many
multimedia capabilities, requires new architectures to efficiently
stream media content to mobile handsets. In this talk we examine the
gains from error-correction codes at the application layer for
streaming media over wireless links. We first quantify the gains of a
class of low-delay error correction codes proposed by E. Martinian and
M. Trott over traditional block codes in several video transmission
architectures. We also develop a robust-extension of these low-delay
codes by studying an information theoretic compound channel model. In
this problem, the sender communicates a common stream to multiple
receivers, each with a different channel quality and requiring a
different delay constraint. The codes designed for this channel
maximize the transmission rate of the media stream while meeting the
delay constraint for each receiver. Finally a syndrome coding dual of
the low-delay codes is proposed and possible applications to
peer-to-peer systems are discussed. If time permits we also discuss
the challenges and some solutions involved in developing a mobile
support for streaming peer-to-peer systems.
BIOGRAPHY:
Ashish Khisti received his PhD and S.M degree from the EECS department
at MIT in 2008 and 2004 respectively and the BASc degree in
Engineering Sciences (EE Option) from the University of Toronto in
2002. He is currently a research scientist at Deutsche Telekom Labs,
Los Altos, California. He will be an assistant professor at the
University of Toronto starting September 2009. His research interests
are in the area of information theory and multimedia systems.
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