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Energy-Efficient Communication Over the Unsynchronized Gaussian Diamond Network

机译:非同步高斯钻石网络上的节能通信

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摘要

Communication networks are often designed and analyzed assuming tight synchronization among nodes. However, in applications that require communication in the energy-efficient regime of low signal-to-noise ratios, establishing tight synchronization among nodes in the network can result in a significant energy overhead. Motivated by a recent result showing that near-optimal energy efficiency can be achieved over the additive white Gaussian noise channel without requiring tight synchronization, we consider the question of whether the potential gains of cooperative communication can be achieved in the absence of synchronization. We focus on the symmetric Gaussian diamond network and establish that cooperative-communication gains are indeed feasible even with unsynchronized nodes. More precisely, we show that the capacity per unit energy of the unsynchronized symmetric Gaussian diamond network is within a constant factor of the capacity per unit energy of the corresponding synchronized network. To this end, we propose a distributed relaying scheme that does not require tight synchronization but nevertheless achieves most of the energy gains of coherent combining.
机译:通常在假定节点之间紧密同步的情况下设计和分析通信网络。但是,在需要以低信噪比的节能方式进行通信的应用中,在网络中的节点之间建立紧密的同步会导致大量的能源开销。根据最近的结果表明,可以在加性高斯白噪声通道上实现几乎最佳的能量效率,而无需紧密同步,这一动机促使我们考虑以下问题:在没有同步的情况下,是否可以实现协作通信的潜在收益。我们关注对称的高斯菱形网络,并确定即使在节点不同步的情况下,协作通信增益的确是可行的。更准确地说,我们表明,非同步对称高斯菱形网络的单位能量容量在相应同步网络的单位能量容量的常数范围内。为此,我们提出了一种分布式中继方案,该方案不需要严格的同步,但是仍然可以实现相干合并的大部分能量增益。

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