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Robust image and video communication for mobile multimedia

Tor Ramstad
Norwegian University of Science and Technology

What characterizes mobile multimedia is multiple signal sources, a multitude of applications, and transmission over channels with limited bandwidth and power, plus varying noise and attenuation. To cope with these variabilities new and more optimal communication systems should be developed. Joint source-channel coding may be one contribution towards this end.
This article suggests an efficient communication principle where the sampled analog signal is first decomposed and thereafter mapped to the channel space using dimension-reducing nonlinear mappings. Optimality of such an approach forartificial sources is discussed, but simulation results for practical still image and video sources are also presented. Graceful degradation as a function of channel deterioration is shown to result from the proposed method.

Tor A. Ramstad was born in Norway in 1942. He received his Siv. Ing. (M. Sc.) and Dr. Ing. (Ph. D.) degrees in 1968 and 1971, respectively, both from the Norwegian Institute of Technology.
He has held various positions at the Faculty of Electrical Engineering and Telecommunications, Norwegian University of Science and Technology, where he since 1983 has been a full professor in Telecommunication Theory.
During the academic year 1982-83 he was a visiting associate professor at the University of California, Santa Barbara, he was with the Georgia Institute of Technology in 1989-90 as a visiting adjunct professor, and he is presently a visiting professor at the University of California, Santa Barbara.
Professor Ramstad's research interests include multirate signal processing, speech and image processing with emphasis on compression, and combined compression/modulation for robust signal transmission.

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