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Spatially coupled repeat-accumulate coded cooperation

机译:空间耦合重复累积编码合作

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In this paper, a new coded cooperation scheme called spatially coupled repeat-accumulate coded cooperation (SC-RA-CC) is proposed for multiple access channels (MAC) with a large number of users and one common destination. The proposed approach combines two advantages of repeat-accumulate (RA) codes and spatial coupling. RA codes show the superior decoding performance with the simple encoding and spatial coupling exhibits the so-called threshold saturation behavior; the threshold of coupled codes with sub-optimal belief propagation (BP) decoding asymptotically achieves the optimal maximum a posterior (MAP) decoding threshold. Our SC-RA-CC can be considered as the distributed version of spatially coupled repeat-accumulate codes which provide the higher spatial diversity and coding gain when both the number of users and the size of packets are limited. The performance of the proposed coded cooperation is analyzed via density evolution (DE). Numerical results confirm that SC-RA-CC can efficiently obtain even higher diversity and coding gain than both direct transmission and conventional adaptive network coded cooperation (ANCC).
机译:在本文中,针对具有大量用户和一个共同目的地的多路访问信道(MAC),提出了一种新的编码合作方案,称为空间耦合重复累积-累积编码合作(SC-RA-CC)。所提出的方法结合了重复累积(RA)码和空间耦合的两个优点。 RA码以简单的编码显示出卓越的解码性能,而空间耦合则表现出所谓的阈值饱和行为。具有次优信念传播(BP)解码的耦合代码的阈值渐近地达到最佳的最大后验(MAP)解码阈值。我们的SC-RA-CC可以看作是空间耦合重复累积代码的分布式版本,当用户数量和数据包大小都受到限制时,它可以提供更高的空间分集和编码增益。通过密度演化(DE)分析了建议的编码合作的性能。数值结果证实,与直接传输和常规自适应网络编码合作(ANCC)相比,SC-RA-CC可以有效地获得更高的分集和编码增益。

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