Joint design of multi-tap analog cancellation and digital beamforming for reduced complexity full duplex MIMO systems
Joint design of multi-tap analog cancellation and digital beamforming for reduced complexity full duplex MIMO systems
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DOI：
10.1109/icc.2017.7997175
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
G. C. Alexandropoulos;M. Duarte
中科院分区：
文献类型：
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作者：
G. C. Alexandropoulos;M. Duarte
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，模拟自干扰消除器的硬件复杂度与发射天线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。在本文中，我们提出了一种新的架构，包括减少数量的抽头（抽头指的是固定延迟和可变移相器和衰减器的线）和简单的多路复用器之间的发送和接收射频链的有效信号路由的模拟消除器。与可用的模拟消除架构相比，每个抽头的值和多路复用器的配置根据某些性能目标与数字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。我们还详细介绍了一个特定的优化目标，连同其派生的解决方案，后者的架构组件。代表性的计算机仿真结果表明，所提出的低复杂度全双工MIMO系统的优越性，最近可用的。
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 scales with the number of transmit and receive antennas, thus exploiting the benefits of analog cancellation becomes impractical for full duplex MIMO transceivers. In this paper, we present a novel architecture for the analog canceller comprising of reduced number of taps (tap refers to a line of fixed delay and variable phase shifter and attenuator) and simple multiplexers for efficient signal routing among the transmit and receive radio frequency chains. In contrast to the available analog cancellation architectures, the values for each tap and the configuration of the multiplexers are jointly designed with the digital 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 cancellation and digital beamforming. We also detail a particular optimization objective together with its derived solution for the latter architectural components. Representative computer simulation results demonstrate the superiority of the proposed low complexity full duplex MIMO system over lately available ones.