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On source and channel codes for multiple inputs and outputs: does multiple description beat space time?

Effros, Michelle and Koetter, Ralf and Goldsmith, Andrea J. and Médard, Muriel (2005) On source and channel codes for multiple inputs and outputs: does multiple description beat space time? In: IEEE Information Theory Workshop (ITW '04), San Antonio, TX, 24-29 October 2004. IEEE , Piscataway, NJ, pp. 324-329. ISBN 0 7803 8720 1.

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We compare two strategies for lossy source description across a pair of unreliable channels. In the first strategy, we use a broadcast channel code to achieve a different rate for each possible channel realization, and then use a multiresolution source code to describe the source at the resulting rates. In the second strategy, we use a channel coding strategy for two independent channels coupled with a multiple description source code. In each case, we choose the coding parameters to minimize the expected end-to-end distortion in the source reconstruction. We demonstrate that in point-to-point communication across a pair of non-ergodic channels, multiple description coding can provide substantial gains relative to multiresolution and broadcast coding. We then investigate this comparison in a simple MIMO channel. We demonstrate the inferior performance of space time coding with multiresolution source coding and broadcast channel coding relative to multiple description codes and a time sharing channel coding strategy. These results indicate that for non-ergodic channels, the traditional definition of channel capacity does not necessarily lead to the best channel code from the perspective of end-to-end source distortion.

Item Type:Book Section
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Additional Information:© Copyright 2006 IEEE – Reprinted with permission. This work was supported in part by NSF Grant #0325324.
Subject Keywords:MIMO systems, broadcast channels, channel capacity, combined source-channel coding, minimization, space-time codes
Record Number:CaltechAUTHORS:EFFitw04
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7359
Deposited By: Lindsay Cleary
Deposited On:06 Feb 2007
Last Modified:08 Nov 2021 20:42

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