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首页> 外文期刊>International Journal of Advances in Engineering Sciences and Applied Mathematics >Physical layer network coding for wireless multi-way relaying with finite signal sets
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Physical layer network coding for wireless multi-way relaying with finite signal sets

机译：具有有限信号集的无线多路中继的物理层网络编码

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摘要

In this survey article, we consider the wireless multi-way relaying scenario, in which there is no direct link connecting the nodes and multiple nodes exchange information with the help of a relay node. In a multi-way relaying scenario, if several nodes transmit simultaneously, due to the superposition nature of the wireless channel, multiple access interference results at the relay node, which can potentially degrade the performance. However, recent results on physical layer network coding for the two-way relay channel with finite signal sets have shown that the multiple access interference can be effectively tackled by a proper choice of transmission schemes at the nodes. The effect of the multiple access interference is the presence of signal set dependent deep channel fade conditions. For the two-way relay channel, the harmful effect of the deep channel fade conditions have been shown to be avoidable using two techniques: (ⅰ) adaptively changing the network coding maps used at the relay node, a process called denoising, which eliminates the harmful effect of the additive noise when a deep channel fade condition occurs (ⅱ) eliminating the occurrence of the deep channel fade conditions at the transmitting nodes itself without any CSIT by Distributed Space Time Coding. We survey the results based on these two schemes for the two-way and three way relaying scenarios and point out some problems which remain unsolved. Towards the end, we discuss about the extension of the schemes developed for the two-way relaying scenario to the multi-way relaying scenario.
机译：在这篇调查文章中，我们考虑了无线多路中继场景，其中没有直接的节点连接节点，多个节点借助中继节点交换信息。在多路中继场景中，如果多个节点同时发送，由于无线信道的叠加特性，在中继节点上会导致多路访问干扰，这可能会降低性能。但是，最近对具有有限信号集的双向中继信道进行物理层网络编码的结果表明，通过在节点上选择适当的传输方案，可以有效地解决多址干扰。多址干扰的影响是存在依赖信号集的深信道衰落条件。对于双向中继信道，已证明可以使用两种技术避免深信道衰落条件的有害影响：（ⅰ）自适应地更改中继节点处使用的网络编码图，此过程称为降噪，从而消除了当发生深度信道衰落情况时，附加噪声的有害影响（ⅱ）消除了分布式节点在没有任何CSIT的情况下通过发送信号本身在发送节点处发生深度信道衰落情况的情况。我们针对两路和三路中继场景基于这两种方案调查了结果，并指出了一些尚待解决的问题。最后，我们将讨论为双向中继场景开发的方案到多路中继场景的扩展。

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