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A network coding approach to cooperative diversity (2007)
| Venue: | IEEE Trans. Inf. Theory |
| Citations: | 60 - 1 self |
BibTeX
@ARTICLE{Xiao07anetwork,
author = {Lei Xiao and Student Member and Thomas E. Fuja and Jörg Kliewer and Senior Member and Daniel J. Costello},
title = {A network coding approach to cooperative diversity},
journal = {IEEE Trans. Inf. Theory},
year = {2007},
pages = {3714--3722}
}
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Abstract
Abstract—This paper proposes a network coding approach to cooperative diversity featuring the algebraic superposition of channel codes over a finite field. The scenario under consideration is one in which two “partners”—Node A and Node B—cooperate in transmitting information to a single destination; each partner transmits both locally generated information and relayed infor-mation that originated at the other partner. A key observation is that Node B already knows Node A’s relayed information (because it originated at Node B) and can exploit that knowledge when decoding Node A’s local information. This leads to an encoding scheme in which each partner transmits the algebraic superposi-tion of its local and relayed information, and the superimposed codeword is interpreted differently at the two receivers — i.e., at the other partner and at the destination node—based on their different a priori knowledge. Decoding at the destination is then carried out by iterating between the codewords from the two partners. It is shown via simulation that the proposed scheme provides substantial coding gain over other cooperative diversity techniques, including those based on time multiplexing and signal (Euclidean space) superposition. Index Terms—Cooperative diversity, error control coding, fading channels, iterative decoding, network coding. I.
Keyphrases
cooperative diversity priori knowledge iterative decoding channel code node local information algebraic superposition proposed scheme node cooperate cooperative diversity technique superimposed codeword time multiplexing index term cooperative diversity destination node euclidean space algebraic superposi-tion relayed information key observation error control coding single destination finite field
