In this paper, we address the antenna selection (AS) problem in full-duplex (FD) cooperative non-orthogonal multiple access (NOMA) systems, where a multi-antenna FD relay bridges the connection between the multi-antenna base station and NOMA far user. Specifically, two AS schemes, namely max-U1 and max-U2, are proposed to maximize the end-to-end signal-to-interference-plus-noise ratio at either or both near and far users, respectively. Moreover, a two-stage AS scheme, namely quality-of-service (QoS) provisioning scheme, is designed to realize a specific rate at the far user while improving the near user’s rate. To enhance the performance of the QoS provisioning AS scheme, the idea of dynamic antenna clustering is applied at the relay to adaptively partition the relay’s antennas into transmit and receive subsets. The proposed AS schemes’ exact outage probability and achievable rate expressions are derived. To provide more insight, closed-form asymptotic outage probability expressions for the max-U1 and max-U2 AS schemes are obtained. Our results show that while the QoS provisioning AS scheme can deliver a near-optimal performance for static antenna setup at the relay, it provides up to 12% average sum rate gain over the optimum AS selection with fixed antenna setup.

中文翻译：

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全双工协作 MIMO-NOMA 系统的新天线选择方案

在本文中，我们解决了全双工 (FD) 协作非正交多址 (NOMA) 系统中的天线选择 (AS) 问题，其中多天线 FD 中继桥接了多天线基站和 NOMA 之间的连接远用户。具体而言，提出了两种 AS 方案，即 max-U1 和 max-U2，以分别在近端和远端用户中的一个或两个处最大化端到端信干噪比。此外，还设计了一种两阶段的AS方案，即服务质量(QoS)提供方案，以实现远端用户的特定速率，同时提高近端用户的速率。为了提高 QoS 供应 AS 方案的性能，在中继处应用了动态天线聚类的思想，以自适应地将中继的天线划分为发送和接收子集。推导出提出的 AS 方案的确切中断概率和可实现的速率表达式。为了提供更多的见解，获得了 max-U1 和 max-U2 AS 方案的封闭式渐近中断概率表达式。我们的结果表明，虽然 QoS 配置 AS 方案可以为中继站的静态天线设置提供近乎最佳的性能，但与固定天线设置的最佳 AS 选择相比，它提供了高达 12% 的平均和速率增益。