Waqar Sahil, Pätzold Matthias
Faculty of Engineering and Science, University of Agder, 4630 Kristiansand, Norway.
Sensors (Basel). 2021 Nov 11;21(22):7496. doi: 10.3390/s21227496.
In this paper, we analyze and mitigate the cross-channel interference, which is found in multiple-input multiple-output (MIMO) radio frequency (RF) sensing systems. For a millimeter wave (mm-Wave) MIMO system, we present a geometrical three-dimensional (3D) channel model to simulate the time-variant (TV) trajectories of a moving scatterer. We collected RF data using a state-of-the-art radar known as Ancortek SDR-KIT 2400T2R4, which is a frequency-modulated continuous wave (FMCW) MIMO radar system operating in the K-band. The Ancortek radar is currently the only K-band MIMO commercial radar system that offers customized antenna configurations. It is shown that this radar system encounters the problem of interference between the various subchannels. We propose an optimal approach to mitigate the problem of cross-channel interference by inducing a propagation delay in one of the channels and apply range gating. The measurement results prove the effectiveness of the proposed approach by demonstrating a complete elimination of the interference problem. The application of the proposed solution on Ancortek's SDR-KIT 2400T2R4 allows resolving all subchannel links in a distributed MIMO configuration. This allows using MIMO RF sensing techniques to track a moving scatterer (target) regardless of its direction of motion.
在本文中，我们分析并减轻了多输入多输出（MIMO）射频（RF）传感系统中存在的跨信道干扰。对于毫米波（mm-Wave）MIMO系统，我们提出了一种几何三维（3D）信道模型，以模拟移动散射体的时变（TV）轨迹。我们使用一种名为Ancortek SDR-KIT 2400T2R4的先进雷达收集RF数据，它是一种在K波段运行的调频连续波（FMCW）MIMO雷达系统。Ancortek雷达是目前唯一提供定制天线配置的K波段MIMO商业雷达系统。结果表明，该雷达系统存在各子信道之间的干扰问题。我们提出了一种最优方法，通过在其中一个信道中引入传播延迟并应用距离选通来减轻跨信道干扰问题。测量结果通过证明完全消除干扰问题证明了所提方法的有效性。将所提解决方案应用于Ancortek的SDR-KIT 2400T2R4能够解析分布式MIMO配置中的所有子信道链路。这使得能够使用MIMO RF传感技术跟踪移动散射体（目标），而不管其运动方向如何。
