摘要
无线通信信道的特性决定了无线通信系统的性能上限.为了解短距离太赫兹信道特性,基于310 GHz频段的信道测量,对太赫兹信道的大尺度衰落特性和小尺度衰落特性进行了研究.分析结果显示,短距离场景下太赫兹信道的路径损耗在0.2 m处与自由空间的路径损耗模型结果一致,0.2 m后实测的路径损耗结果较小,传播条件优于自由空间.对莱斯K因子和均方根时延扩展的结果分析表明,与低频段信道相比,太赫兹信道的时延色散程度更低,直射径信号占据主要的接收信号能量;莱斯K因子与均方根时延扩展表现出了强相关性.这些结果为设计和优化短距离太赫兹通信提供了理论模型的基础.
The wireless channel is the medium in which electromagnetic waves propagate in the air,and the channel characteristics determine the performance of the wireless communication system.To understand the terahertz channel characteristics in short-distance scenarios,based on the channel measurement in the 310 GHz frequency band,the large-scale fading characteristics and the small-scale fading characteristics of the terahertz channel are studied.The analysis of the results shows that the path loss of the terahertz channel in the short-distance scenario is consistent with the results of the free-space path loss model at 0.2 m.After 0.2 m,the measured path loss results are smaller,and the propagation conditions are better than the free space.The results of the Rice K factor and root-mean-square(RMS)delay spread shows that compared with low-frequency channels,the terahertz channel has a lower degree of delay dispersion,and the direct path occupies the main received signal energy.The Rice K factor and RMS delay spread shows a strong correlation.These results provide a theoretical model basis for the design and optimization of short-distance terahertz communications.
作者
田浩宇
唐盼
田磊
张建华
何敬锁
TIAN Hao-yu;TANG Pan;TIAN Lei;ZHANG Jian-hua;HE Jing-suo(State Key Laboratory of Networking and Switching Technology,Beijing University of Posts and Telecommunications,Beijing 100876,China;Key Laboratory of Terahertz Optoelectronics(Ministry of Education),Capital Normal University,Beijing 100048,China)
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2020年第6期59-65,共7页
Journal of Beijing University of Posts and Telecommunications
基金
国家重点研发计划项目(2020YFB1805002)
国家自然科学基金杰出青年基金项目(61925102)
国家自然科学基金项目(61675138)
