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The three-node wireless network: achievable rates and Cooperation strategies

机译：三节点无线网络：可实现的速率和合作策略

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摘要

We consider a wireless network composed of three nodes and limited by the half-duplex and total power constraints. This formulation encompasses many of the special cases studied in the literature and allows for capturing the common features shared by them. Here, we focus on three special cases, namely, 1) relay channel, 2) multicast channel, and 3) three-way channel. These special cases are judicially chosen to reflect varying degrees of complexity while highlighting the common ground shared by the different variants of the three-node wireless network. For the relay channel, we propose a new cooperation scheme that exploits the wireless feedback gain. This scheme combines the benefits of the decode-and-forward (DF) and compress-and-forward (CF) strategies and avoids the noiseless feedback assumption adopted in earlier works. Our analysis of the achievable rate of this scheme reveals the diminishing feedback gain in both the low and high signal-to-noise ratio (SNR) regimes. Inspired by the proposed feedback strategy, we identify a greedy cooperation framework applicable to both the multicast and three-way channels. Our performance analysis reveals the asymptotic optimality of the proposed greedy approach and the central role of list source-channel decoding in exploiting the receiver side information in the wireless network setting.
机译：我们考虑一个由三个节点组成的无线网络，该网络受半双工和总功率限制。这种表述涵盖了文献中研究的许多特殊情况，并允许捕获它们共享的共同特征。在这里，我们重点介绍三种特殊情况，即1）中继通道，2）多播通道和3）三向通道。在司法上选择这些特殊情况以反映不同程度的复杂性，同时强调三节点无线网络的不同变体所共有的共同点。对于中继信道，我们提出了一种利用无线反馈增益的新协作方案。该方案结合了解码转发（DF）和压缩转发（CF）策略的优点，并且避免了早期工作中采用的无噪声反馈假设。我们对该方案可实现速率的分析表明，在低信噪比（SNR）和高信噪比（SNR）方案中，反馈增益都在下降。受拟议的反馈策略的启发，我们确定了适用于多播和三向通道的贪婪合作框架。我们的性能分析揭示了所提出的贪婪方法的渐近最优性，以及列表源通道解码在无线网络环境中利用接收机端信息方面的核心作用。

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