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arXiv 1809.09474cs.ITmath.IT
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低复杂度全双工MIMO:新型模拟抵消结构和收发器设计

Low Complexity Full Duplex MIMO: Novel Analog Cancellation Architectures and Transceiver Design

George C. Alexandropoulos, Melissa Duarte

摘要:

在多输入多输出(MIMO)系统中实现全双工操作提供了提高吞吐量性能的潜力。然而,新兴全双工MIMO设计中的模拟自干扰消除器的硬件复杂度主要与发射和接收天线的数量成比例,因此利用模拟消除的益处对于全双工MIMO收发器来说变得不切实际,即使对于中等数量的天线也是如此。在本文中,我们提出了两种新型模拟消除器架构,与现有技术相比,消除元件数量减少,并且使用简单的多路复用器在发送和接收射频链之间进行高效信号路由。一种架构基于模拟抽头(抽头指的是固定延迟、可变移相器和衰减器的线路),另一种架构基于在本地生成消除信号的辅助(AUX)发射机(TX)。与可用的模拟消除架构相比,每个抽头或每个AUX TX的值以及多路复用器的配置根据某些性能目标与数字发送和接收波束成形滤波器联合设计。以窄带平坦衰落信道模型为例,提出了一种模拟自干扰抵消和数字波束形成联合设计的通用优化框架。我们还详细介绍了总和速率优化目标及其派生的解决方案,后者的架构组件。代表性的计算机模拟结果表明,无论是在硬件复杂度和可实现的性能的建议的低复杂度全双工MIMO方案比最近可用的。

英文摘要:

Incorporating full duplex operation in Multiple Input Multiple Output (MIMO) systems provides the potential of boosting throughput performance. However, the hardware complexity of the analog self-interference canceller in emerging full duplex MIMO designs mostly scales with the number of transmit and receive antennas, thus exploiting the benefits of analog cancellation becomes impractical for full duplex MIMO transceivers, even for moderate number of antennas. In this paper, we present two novel architectures for the analog canceller comprising of reduced number of cancellation elements, compared to the state of the art, and simple multiplexers for efficient signal routing among the transmit and receive radio frequency chains. One architecture is based on analog taps (tap refers to a line of fixed delay, variable phase shifter, and attenuator) and the other on AUXiliary (AUX) Transmitters (TXs) that locally generate the cancellation signal. In contrast to the available analog cancellation architectures, the values for each tap or each AUX TX and the configuration of the multiplexers are jointly designed with the digital transmit and receive beamforming filters according to certain performance objectives. Focusing on a narrowband flat fading channel model as an example, we present a general optimization framework for the joint design of analog self-interference cancellation and digital beamforming. We also detail the sum rate optimization objective together with its derived solution for the latter architectural components. Representative computer simulation results demonstrate the superiority both in terms of hardware complexity and achievable performance of the proposed low complexity full duplex MIMO schemes over the lately available ones.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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