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arXiv 1209.4483cs.ITmath.IT
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多址中继信道上的计算转发:编码和对称速率优化

Compute-and-Forward on a Multiaccess Relay Channel: Coding and Symmetric-Rate Optimization

Mohieddine El Soussi, Abdellatif Zaidi, Luc Vandendorpe

摘要:

我们考虑一个系统,其中两个用户与目的地通信的帮助下,一个半双工中继。基于计算转发方案,我们开发和评估的编码策略,是网络编码的精神。在该框架中,目的地解码与所发送的码字相关的两个整数值线性组合,而不是解码用户的信息消息。两种解码方案被认为是。在第一种情况下,中继计算其中一个线性组合,然后将其转发到目的地。目的地基于直接传输计算另一线性组合。在第二种情况下,考虑到通过直接链路在目的地可用的边信息,中继使用Wyner-Ziv压缩来压缩它得到的边信息,并将其传送到目的地。然后,目的地在本地计算这两个线性组合。对于这两种编码方案,我们讨论了设计标准,并推导出允许的码率。接下来,我们解决了功率分配和整数值系数的选择,以最大限度地提高提供的码率,提出了一种迭代坐标下降方法。分析表明,第一种方案可以优于标准的中继技术,在某些制度,和第二种方案,而依赖于可行的结构格码,最多可以达到相同的性能,定期压缩和转发的多址中继网络模型,我们研究。通过数值算例说明了结果。

英文摘要:

We consider a system in which two users communicate with a destination with the help of a half-duplex relay. Based on the compute-and-forward scheme, we develop and evaluate the performance of coding strategies that are of network coding spirit. In this framework, instead of decoding the users' information messages, the destination decodes two integer-valued linear combinations that relate the transmitted codewords. Two decoding schemes are considered. In the first one, the relay computes one of the linear combinations and then forwards it to the destination. The destination computes the other linear combination based on the direct transmissions. In the second one, accounting for the side information available at the destination through the direct links, the relay compresses what it gets using Wyner-Ziv compression and conveys it to the destination. The destination then computes the two linear combinations, locally. For both coding schemes, we discuss the design criteria, and derive the allowed symmetric-rate. Next, we address the power allocation and the selection of the integer-valued coefficients to maximize the offered symmetric-rate; an iterative coordinate descent method is proposed. The analysis shows that the first scheme can outperform standard relaying techniques in certain regimes, and the second scheme, while relying on feasible structured lattice codes, can at best achieve the same performance as regular compress-and-forward for the multiaccess relay network model that we study. The results are illustrated through some numerical examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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