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Generalized Backward Decoding Strategies for the Relay Channel.

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Title: Generalized Backward Decoding Strategies for the Relay Channel.
Authors: Hon-Fah Chong1, Motani, Mehul1, Garg, Hari Krishna1
Source: IEEE Transactions on Information Theory. Jan2007, Vol. 53 Issue 1, p394-401. 8p. 2 Diagrams, 2 Charts.
Subject Terms: *INFORMATION theory, *MATHEMATICAL statistics, *MULTIVARIATE analysis, CODING theory, DATA compression, DIGITAL electronics, SIGNAL theory, MATHEMATICAL variables, CORRESPONDENCE schools & courses
Abstract: This correspondence studies coding strategies for a three-node relay channel. We start with the basic coding strategies of Cover and El Gamal: the relay decodes the source message and forward it to the destination (cooperation); the relay transmits its compressed channel outputs to the destination (facilitation); or the relay superimposes both cooperation and facilitation (generalized). In this paper, two new generalized strategies superimposing cooperation and facilitation are introduced and investigated on the general relay channel. The first strategy makes use of sequential backward (SeqBack) decoding while the second strategy makes use of simultaneous backward (SimBack) decoding. The achievable rate for the second strategy is shown to include that of the generalized strategy of Cover and El Carnal. Assuming zero-mean, jointly Gaussian random variables, the two new strategies give higher achievable rates than the generalized strategy of Cover and El Carnal for certain parameters on the Gaussian relay channel. [ABSTRACT FROM AUTHOR]
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Database: Business Source Index
Description
Abstract:This correspondence studies coding strategies for a three-node relay channel. We start with the basic coding strategies of Cover and El Gamal: the relay decodes the source message and forward it to the destination (cooperation); the relay transmits its compressed channel outputs to the destination (facilitation); or the relay superimposes both cooperation and facilitation (generalized). In this paper, two new generalized strategies superimposing cooperation and facilitation are introduced and investigated on the general relay channel. The first strategy makes use of sequential backward (SeqBack) decoding while the second strategy makes use of simultaneous backward (SimBack) decoding. The achievable rate for the second strategy is shown to include that of the generalized strategy of Cover and El Carnal. Assuming zero-mean, jointly Gaussian random variables, the two new strategies give higher achievable rates than the generalized strategy of Cover and El Carnal for certain parameters on the Gaussian relay channel. [ABSTRACT FROM AUTHOR]
ISSN:00189448
DOI:10.1109/TIT.2006.887067