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Cellular Video
Harnessing Channel
Uncertainty with Fuzzy Inferencing |
Cellular data channels are plagued by uncertainties posed by the harsh
cellular wireless medium. This work investigated channel uncertainty at
the physical layer, and showed how to harness these uncertainties to
improve performance of systems and applications - for instance, the
H.324M mobile video conferencing system.
Inspired by non-linear control
theory, this work proposes a new technique to exploit channel uncertainty
using a novel fuzzy inferencing method to enable joint source-channel
optimization. This method has been implemented as a standalone
controller and integrated with a full-fledged H.324M mobile video software
implementation. Experimental results demonstrate substantial
improvement (up to 6 dB) in video picture quality for a broad range of video
signals and wireless channel conditions.
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