While fairly technical at times, the one thing that stood out is that the computational power and especially memory available (3G cell stuff and maybe 256K) is not that large. So it could be implemented. However, this appears more for multicasting in the case of the "fountain codes."
He indicated that the coding community is moving toward replacing turbo codes with irregular LDPC but I do not understand how this stuff works. If I understand it correctly, it is the raptor codes that have the FEC structure. It is amazing that we can access this kind of multimedia presentation on a time shifted basis and at no charge! 73, Rick, KV9U Leigh L Klotz, Jr. wrote: >You might like this talk, which is available in audio and video >formats: > > > http://www.parc.com/cms/get_article.php?id=344 > >It covers Turbo, Tornado, and LDPC codes. The focus is on a FEC >mechanism for broadcast to receivers over a noisy channel. LDPC codes >are supposedly close to the Shannon limit, though computationally >expensive. This talk brings up a lot of these interesting issues. > >You can hear me ask the speaker if it's OK to use their patented >technology for amateur radio and his response, which I interpreted to be >"ok." > >Leigh / WA5ZNU > > Using Powerful FEC Codes for File and Streaming Delivery to Mobile >Receivers > > Michael Luby, Digital Fountain, Inc > > We describe Raptor codes, the most flexible and powerful FEC codes >available for delivery of data over packet-based networks. We >demonstrate that Raptor codes are crucial for both efficient delivery of >files and for high-quality video streaming over emerging broadcast and >multicast wireless networks. Example applications include delivery of >navigational updates and point-of-interest data to automobiles and >delivery of multimedia files and H.263 streaming video to 3G telephones >and PDAs. Standardization of the general approach of using FEC codes for >file and streaming delivery within the IETF and 3GPP will also be >outlined. > > > > Dr. Michael Luby cofounded Digital Fountain, Inc. in 1998, where he >currently holds the position of Chief Technology Officer. Michael is a >world-renowned Theoretical Computer Scientist, and has made breakthrough >research contributions in the areas of coding theory, randomized >algorithm design and analysis, transport protocols and cryptography. He >is actively leading the development of several transport standards >within the Internet Engineering Task Force (IETF). After receiving his >Ph.D. in Theoretical Computer Science from UC Berkeley in 1983 he was a >Professor in Computer Science at the University of Toronto. In 1988 >Michael joined the International Computer Science Institute in Berkeley >to become the Leader of the Theory Group and concurrently an Adjunct >Professor at UC Berkeley. Michael is a recipient of the 2002 Information >Theory Society Paper Award for some of his coding theory research and >the 2003 SIAM Outstanding Paper Prize for some of his cryptography >research. > > Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
