Fast and High-Resolution NLoS Beam Switching Over Commercial Off-the-Shelf mmWave Devices
Fast and High-Resolution NLoS Beam Switching Over Commercial Off-the-Shelf mmWave Devices
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DOI：
10.1109/tmc.2021.3064809
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发表时间：
2022-11
影响因子：
7.9
通讯作者：
Xueyang Hu;Tian Liu;Tao Shu
中科院分区：
文献类型：
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作者：
Xueyang Hu;Tian Liu;Tao Shu
毫米波通信的高方向性使得其视线（LoS）路径在用户移动时容易受到阻塞。大多数现有解决方案对发射器和接收器的天线具有非常严格的要求，这很难被当今的消费级商用现成（COTS）毫米波产品所满足。实际上，COTS设备使用低分辨率宽波束天线，因此不能支持上述用于响应于LoS阻塞的NLoS波束切换的方法。本文提出了一种基于粗粒度宽波束相控阵天线的高分辨率毫米波多径信道分辨新方法。我们设计了一种新的实时波束切换算法，允许COTS设备估计的位置和反射系数的主要反射器。每当当前LoS被阻塞时，我们的算法可以基于估计的反射器实时计算最佳替代波束方向，以建立强大的NLoS链路。我们实现了所提出的算法上的COTS毫米波设备和评估系统的物理层和传输层的性能。我们的实验证明了我们的算法在估计主导反射器和计算强替代波束方向上的有效性，以及它在为COTS毫米波设备提供鲁棒连接方面的功效。
The high directionality of mmWave communication makes its line-of-sight (LoS) path susceptible to blockage when the user is moving. Most existing solutions have very stringent requirements on the antennas of the transmitter and the receiver, which are hardly met by today’s consumer-level commercial off-the-shelf (COTS) mmWave products. In reality, a COTS device uses low-resolution wide-beam antennas, and hence cannot support the aforementioned methods for NLoS beam switching in response to the LoS blockage. In this paper, we develop a new method to support high-resolution mmWave multi-path channel resolving based on coarse-grained wide-beam phased array antennas. We design a novel real-time beam-switching algorithm that allows COTS devices to estimate the location and reflection coefficient of the dominant reflectors. Whenever the current LoS is blocked, our algorithm can compute in real-time the best alternative beam direction based on estimated reflectors to establish a strong NLoS link. We implemented the proposed algorithm on a COTS mmWave device and evaluated the system’s performance on the physical and transport layer. Our experiments demonstrate the effectiveness of our algorithm on estimating dominant reflectors and calculating strong alternative beam directions, and its efficacy in providing robust connections for COTS mmWave devices.