A network coding approach to cooperative diversity

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 ldquopartnersrdquo - node A and node B - cooperate in transmitting information to a single destinati...

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Vydané v:IEEE transactions on information theory Ročník 53; číslo 10; s. 3714 - 3722
Hlavní autori: Lei Xiao, Fuja, T., Kliewer, J., Costello, Daniel J.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: New York IEEE 01.10.2007
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:
Algebra
Amplitude modulation
Channels
Coding
Communication channels
Computer networks
Cooperative diversity
Data transmission
Decoding
Digital relays
error control coding
Error correction
Euclidean space
Fading
fading channels
Gain
Galois fields
Iterative decoding
Mathematical analysis
Network coding
Networks
Protective relaying
Pulse modulation
Robustness
Transmission
ISSN:0018-9448, 1557-9654
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Popis
Shrnutí: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 ldquopartnersrdquo - node A and node B - cooperate in transmitting information to a single destination; each partner transmits both locally generated information and relayed information 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 superposition 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.
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ISSN:0018-9448
1557-9654
DOI:10.1109/TIT.2007.904990