收稿日期: 2017-02-20
网络出版日期: 2019-02-26
基金资助
国家自然科学基金面上资助项目(61571282)
Wireless channel measurements and analysis at 1.8 GHz in a tunnel environment
Received date: 2017-02-20
Online published: 2019-02-26
基于多输入多输出(multiple input multiple output, MIMO)技术的地铁长期演进系统(long term evolution-metro, LTE-M)将在下一代城市轨道交通列车控制系统中得以应用. 由于LTE-M工作于1.8 GHz频段, 因此研究在隧道环境下1.8 GHz频段的传播特性非常重要. 利用宽带扩频序列以及虚拟MIMO方法, 测量并分析了隧道内1.8 GHz频段自由天线的路径损耗、均方根(root mean square, RMS)时延、MIMO容量等传播特性. 结果表明: 在隧道环境下1.8 GHz频段的路径损耗因子低于自由空间内的路径损耗因子; 隧道横截面积的变化会影响电磁波的传播特性; MIMO天线阵规模越大, 容量越大; 天线间距的变化会引起MIMO容量的变化.
裴欣栋, 尹晓宇, 武艺鸣, 郑国莘 . 隧道环境下1.8 GHz无线信道测量与分析[J]. 上海大学学报(自然科学版), 2019 , 25(1) : 24 -34 . DOI: 10.12066/j.issn.1007-2861.1885
The long term evolution-metro (LTE-M) method based on multiple input multiple output (MIMO) technology will be used in the next generation urban rail transit train control systems. As LTE-M works in the 1.8 GHz band, it is important to study wave propagation characteristics in a tunnel environment at 1.8 GHz. Using a wideband spread spectrum sequence and the virtual MIMO method, the key radio channel characteristics of a tunnel at 1.8 GHz are investigated, including path loss, root mean square (RMS) delay spread, and MIMO channel capacity. The results show that the path loss factor in a tunnel environment at 1.8 GHz is lower than that in a free space, and changes in the tunnel cross-sectional area can affect electromagnetic wave propagation. Besides, the larger the number of MIMO antenna array elements, the greater the capacity. Changing the antenna spacing can change MIMO capacity.
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