The increasingly demanding objectives for next-generation wireless communications have spurred recent research activities on multiantenna transceiver hardware architectures and relevant intelligent communication schemes. Among them belong full-duplex (FD) multiple-input, multiple-output (MIMO) architectures, which offer the potential for simultaneous uplink (UL) and downlink (DL) operations in the entire frequency band. However, as the number of antenna elements increases, the interference signal leaking from the transmitter (Tx) of the FD radio to its receiver (Rx) becomes more severe. In this article, we present a unified FD massive MIMO architecture comprising analog and digital transmit and receive beamforming (BF) as well as analog and digital self-interference (SI) cancellation, which can be jointly optimized for various performance objectives and complexity requirements. The performance evaluation results for applications of the proposed architecture to fully digital and hybrid analog and digital-BF operations using recent algorithmic designs as well as simultaneous communication of data and control (SCDC) signals are presented. It is shown that the proposed architecture, for both small and large numbers of antennas, enables improved spectral-efficient FD communications with fewer analog-cancellation elements compared to various benchmark schemes. The article concludes with a list of open challenges and research directions for future FD massive MIMO communication systems and their promising applications.

中文翻译：

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全双工大规模多输入、多输出架构：最新进展、应用和未来方向


下一代无线通信的日益苛刻的目标刺激了最近对多天线收发器硬件架构和相关智能通信方案的研究活动。其中包括全双工 (FD) 多输入多输出 (MIMO) 架构，它提供了在整个频段同时上行链路 (UL) 和下行链路 (DL) 操作的潜力。然而，随着天线元件数量的增加，从 FD 无线电的发射器 (Tx) 泄漏到其接收器 (Rx) 的干扰信号变得更加严重。在本文中，我们提出了一种统一的 FD 大规模 MIMO 架构，包括模拟和数字发射和接收波束成形 (BF) 以及模拟和数字自干扰 (SI) 消除，可以针对各种性能目标和复杂性要求进行联合优化。提出了使用最新算法设计以及数据和控制（SCDC）信号同步通信将所提出的架构应用于全数字和混合模拟和数字 BF​​ 操作的性能评估结果。结果表明，与各种基准方案相比，无论是少量天线还是大量天线，所提出的架构都可以通过更少的模拟消除元件实现改进的频谱效率 FD 通信。本文最后列出了未来 FD 大规模 MIMO 通信系统及其有前景的应用的开放挑战和研究方向。