Optimized low-delay source-channel-relay mappings

The three-node relay channel with a Gaussian source is studied for transmission subject to a low-delay constraint. A design algorithm for joint source¿channel mappings is proposed and numerically evaluated. The designed system is compared with reference systems, based on modular source and channel c...

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Vydáno v:IEEE transactions on communications Ročník 58; číslo 5; s. 1397 - 1404
Hlavní autoři: Karlsson, Johannes, Skoglund, Mikael
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.05.2010
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Algorithm design and analysis
Channel coding
Context
Estimation
Information technology
Informationsteknik
Iterative decoding
joint source-channel coding
Power system relaying
Quantization
relay channel
Relays
sensor networks
TECHNOLOGY
TEKNIKVETENSKAP
Telecommunication
Telekommunikation
Visualization
Wireless sensor networks
ISSN:0090-6778, 1558-0857, 1558-0857
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Shrnutí:The three-node relay channel with a Gaussian source is studied for transmission subject to a low-delay constraint. A design algorithm for joint source¿channel mappings is proposed and numerically evaluated. The designed system is compared with reference systems, based on modular source and channel coding, and the distortion-rate function for the Gaussian source using known achievable rates for the relay channel. There is a significant gain, in terms of decreased power, in using the (locally) optimized systems compared with the reference systems. The structure of the resulting source mapping and the relay mapping is visualized and discussed in order to gain understanding of fundamental properties of optimized systems. Interestingly, the design algorithm generally produces relay mappings with a structure that resembles Wyner-Ziv compression.
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content type line 14
ISSN:0090-6778
1558-0857
1558-0857
DOI:10.1109/TCOMM.2010.05.080595