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首页> 外文期刊>IEEE Transactions on Information Theory >On the Degrees-of-Freedom of Two-Unicast Wireless Networks With Delayed CSIT
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On the Degrees-of-Freedom of Two-Unicast Wireless Networks With Delayed CSIT

机译：CSIT延迟的两个单播无线网络的自由度

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摘要

We characterize the degrees-of-freedom (DoF) region of a class of two-unicast wireless networks under the assumption of delayed channel state information at the transmitters. We consider a layered topology with arbitrary connectivity, and we introduce new outer-bounds on the DoF region of such networks through the graph-theoretic notion of bottleneck nodes. Such nodes act as informational bottlenecks only under the assumption of delayed channel state information. We also present new transmission schemes that achieve the outer-bounds. We show that unlike the instantaneous channel state information model, the sum DoF of two-unicast networks with delayed channel knowledge can take an infinite set of values. In this paper, we compare our results to the best previously known outer-bounds, and we show that the gap can be arbitrary large in favor.
机译：我们在发射机处存在延迟信道状态信息的情况下，描述了一类双单播无线网络的自由度（DoF）区域。我们考虑具有任意连通性的分层拓扑，并通过瓶颈节点的图论概念在此类网络的DoF区域上引入新的外边界。仅在延迟的信道状态信息的假设下，此类节点才充当信息瓶颈。我们还提出了实现外部界限的新传输方案。我们表明，与瞬时信道状态信息模型不同，具有延迟信道知识的两个单播网络的总DoF可以采用无穷多个值。在本文中，我们将我们的结果与先前已知的最佳外边界进行了比较，并表明差距可以任意大。

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