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Robust cooperative beamforming for MIMO decode-and-forward one-way relay networks

机译：MIMO解码转发单向中继网络的鲁棒协作波束成形

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摘要

Relays play a pivotal role in extending the service quality at the cell edges of LTE/LTE-A networks. In this letter, a one-way relay channel with a direct link which is equipped with multiple antennas at the source and relay nodes, acting in a half-duplex regime is investigated. To best design the precoder of the source and relay nodes, the channel state information (CSI) of both links are required. Usually, this information is not perfectly known. To overcome this limitation, a worst-case robust design is proposed in this paper. We assume that the CSI is known to conform to a ball-shaped uncertainty set. The design problem is formulated to maximize the achievable rate of the whole system while maintaining the regulatory constraints on the transmit power limits. The aforementioned design problem is formulated as a semi-definite programming problem, and two approximate convex counterparts are proposed. Finally, we numerically compare the data rates of both designs using extensive simulations. (C) 2019 Elsevier B.V. All rights reserved.
机译：中继在扩展LTE / LTE-A网络的小区边缘的服务质量方面起着关键作用。在这封信中，研究了一种具有直接链路的单向中继信道，该信道在源和中继节点上配备了多个天线，并以半双工方式工作。为了最好地设计源节点和中继节点的预编码器，需要两条链路的信道状态信息（CSI）。通常，此信息不是很清楚。为了克服这一限制，本文提出了最坏情况的鲁棒设计。我们假设已知CSI符合球形不确定性集合。制定设计问题以最大程度地提高整个系统的可实现速率，同时保持对发射功率限值的监管约束。将上述设计问题公式化为半定规划问题，并提出了两个近似的凸凸对应物。最后，我们使用广泛的仿真数字比较两种设计的数据速率。 （C）2019 Elsevier B.V.保留所有权利。

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