A network coding approach to cooperative diversity

被引:190
|
作者
Xiao, Lei [1 ]
Fuja, Thomas E. [1 ]
Kliewer, Joerg [1 ]
Costello, Daniel J., Jr. [1 ]
机构
[1] Univ Notre Dame, Dept Elect Engn, Notre Dame, IN 46556 USA
基金
美国国家航空航天局; 美国国家科学基金会;
关键词
cooperative diversity; error control coding; fading channels; iterative decoding; network coding;
D O I
10.1109/TIT.2007.904990
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
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 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.
引用
收藏
页码:3714 / 3722
页数:9
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