On-Body NLoS Radio Channel at Millimeter-Wave Frequencies
On-Body NLoS Radio Channel at Millimeter-Wave Frequencies
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DOI：
10.1109/tap.2022.3229139
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发表时间：
2023-02
影响因子：
5.7
通讯作者：
K. Ali;A. Brizzi;A. Khan;Y. Hao
中科院分区：
文献类型：
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作者：
K. Ali;A. Brizzi;A. Khan;Y. Hao
本文分析了毫米波频率下的人体无线电信道，并提出了减少路径损耗的可能解决方案，特别是在非视距（NLoS）位置。我们选择了手腕和腰部的两个特定通道，并在94 GHz的频率下进行了全面的研究。观察到，在织物存在下，可以在人体表面附近切向激发慢波模式。衣服和衣服与人体表面之间的稀薄空气可以归因于NLoS处的路径损耗的减小。我们的研究结果表明，不同的服装材料的存在与身体上的无线电信道的路径损耗的变化。此外，我们还通过数值计算证明了在衣服下面贴上薄金属片可以进一步降低路径损耗。在我们的参数研究中，最大15 dB的下降发生在路径损耗只有30厘米的距离。基于刀口衍射（KED）方法的稳健理论模型已被应用于对这种独特的无线电传播机制的物理见解，这可以在5G通信及其他领域产生丰富的应用。
This article presents an analysis of on-body radio channels at millimeter-wave frequencies and possible solutions to reduce the path loss, particularly, at non-line of sight (NLoS) locations. We have chosen two specific channels around the wrist and waist, and a comprehensive study has been conducted at the frequency of 94 GHz. It is observed that in the presence of textile, a slow wave mode can be excited tangentially near the surface of human body. Clothing and the thin air between the clothing and the human body surface may attribute to the reduction of path loss at NLoS. Our findings show that the presence of different garment materials is linked to the variation of path loss in on-body radio channels. Moreover, we demonstrate numerically that by attaching thin metallic sheet underneath clothing may further reduce the path loss. In our parametric study, a maximum of 15 dB drop occurs in path loss at only 30 cm distance. A robust theoretical model based on the knife edge diffraction (KED) method has been applied to give physical insights of such a unique radio propagation mechanism, that can lead to abundant applications in 5G communications and beyond.