MIT Department of Electrical Engineering & Computer Science
Digital Links: Advanced Methods for Wired and Wireless Communication
Mitchell Trott
MIT, EECS, LIDS
Monday, September 9, 1996
4:00 PM (3:30 refreshments)
Edgerton Hall, Room 34-101
EECS Colloquium
Abstract
In the design of modern communication systems, modulation and coding
are often used to convert the physical channel into a more-or-less
transparent bit pipe. A variety of advanced modulation and coding
methods have been proposed or implemented for applications such as
dialup modems, cellular phones, wireless networks, and high-speed
digital communication over existing unshielded copper or cable
television lines. Some of these methods use newly-invented specific
techniques, while others represent the maturation of old ideas that
the continuing increase in computing power has only recently made
practical. We describe several of these methods and discuss whether
their performance is limited primarily by basic physical constraints,
implementation complexity, or ignorance of better methods.
Such digital techniques have been surprisingly slow to penetrate
certain mass-market applications, most notably broadcast television
and in-home cordless phones. Apparently, the modern viewpoint is not
commercially compelling for those applications. We show that there is
a theoretical basis for this effect: the separation of the physical
layer from higher-level functions, while often useful from an
implementation and conceptual standpoint, demonstrably fails to
provide an optimum match of some available communications channels to
some information sources. Future systems for communication of
initially analog data may therefore have elements that more closely
resemble those designed 30 years ago than those designed today.
URL of this page:
http://www-eecs.mit.edu/AY96-97/events/1.html
Created: Aug 29, 1996
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Modified: Jun 24, 1997
This announcement is from the MIT EECS 1996-97 archive.
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