Terahertz indoor channel optimization and wedge fading characteristics analysis based on multisignal sources,International Journal of Communication Systems

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Terahertz indoor channel optimization and wedge fading characteristics analysis based on multisignal sources
International Journal of Communication Systems ( IF 1.7 ) Pub Date : 2020-10-18 , DOI: 10.1002/dac.4653
Qingfeng Jing ₁ , Yewen Liang ₁

Affiliation

Indoor wireless communication systems are rapidly expanding, creating a growing demand for individual data rates. This paper explores the influence of the indoor source layout on the received signal for future ultrawideband indoor terahertz communication systems. The optimization of the number, distance, and arrangement of sources can improve the indoor signal coverage efficiency and reduce the fluctuation of the signal‐to‐noise ratio (SNR) of each position indoors. The optimization results for the number, distance, and arrangement of sources demonstrate that optimal coverage can be achieved using nine sources with a distance factor of 0.15 in a rectangular arrangement located in the center of the room in an office environment of 15 × 12 × 2.5 m (L × W × H) in size. Increasing the number of sources has little effect on the uniformity of the indoor signal power distribution. Under the optimal coverage, the SNR fluctuation in an empty room can be reduced from 10.77 to 2.5 dB, which guarantees that users can obtain nearly the same communication quality regardless of their location. Moreover, the impact characteristics of two typical wedges fading, namely, fixed shadow objects and moving human bodies, under one or multiple sources are also analyzed. Multisource distribution is found to significantly improve the shadow attenuation effect of wedge fading when there are fixed objects or people walking indoors. In addition, the moving human body attenuation model is extended by combining a Markov process with a ray‐tracing simulation. The results show that the probability of the ideal state under a multisource distribution is significantly higher than that under a single‐source distribution, and it is less influenced by the number of people.

中文翻译：

基于多信号源的太赫兹室内信道优化和楔形衰落特性分析

室内无线通信系统正在迅速扩展，对单个数据速率的需求不断增长。本文探讨了室内信号源布局对未来超宽带室内太赫兹通信系统接收信号的影响。优化信号源的数量，距离和布置可以提高室内信号覆盖效率，并减少室内每个位置的信噪比（SNR）的波动。光源数量，距离和布置的优化结果表明，在15×12×2.5的办公环境中，使用九个光源（距离系数为0.15）在房间中央的矩形布置中可以实现最佳覆盖范围尺寸m（L×W×H）。增加源数量对室内信号功率分布的均匀性影响很小。在最佳覆盖范围内，空房间的SNR波动可以从10.77降低到2.5 dB，这保证了无论用户身在何处，都能获得几乎相同的通信质量。此外，还分析了两种典型的楔形衰落在一个或多个源下的撞击特性，即固定的阴影物体和移动的人体。当有固定物体或人在室内行走时，发现多源分布可显着改善楔形衰落的阴影衰减效果。此外，通过将马尔可夫过程与光线跟踪仿真相结合，扩展了人体移动衰减模型。

更新日期：2020-12-03

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