Adaptive network coded cooperation (ANCC) for wireless relay networks: Matching code-on-graph with network-on-graph

被引:121
作者
Bao, Xingkai [1 ]
Li , Jing [1 ]
机构
[1] Lehigh Univ, Dept Comp Sci & Elect Engn, Bethlehem, PA 18015 USA
基金
美国国家科学基金会;
关键词
user cooperation; relay networks; network coding; codes-on-graphs; low-density parity-check (LDPC) codes; low-density generator-matrix (LDGM) codes;
D O I
10.1109/TWC.2008.060439
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We consider user cooperation in a relay network that comprises a large collection of transmitters sending wireless data to a common receiver. A new framework exploiting the network coding technology, referred to as adaptive network coded cooperation (ANCC), is proposed to combat the lossy nature of wireless links and to adapt to the changing network topology. The central idea is to match network-on-graph, i.e. instantaneous network topologies described in graphs, with the well-known class of code-on-graph, i.e. low-density parity-check (LDPC) codes and LDPC-like codes. Both achievable rates and outage probabilities are evaluated for ANCC, and closed-form expressions are derived for the asymptotic case where the network size increases without bound. Compared with the existing schemes, ANCC significantly outperforms repetition-based schemes and performs on par with space-time coded cooperation (STCC), but obviates the need for stringent inter-user synchronization at the bit/baud level.
引用
收藏
页码:574 / 583
页数:10
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