低空无线信道小尺度衰落特性研究  

Research on Small-Scale Fading Characteristics of Low Altitude Wireless Channel

作　　者：于坤灿 向新[1] 王鹏[1] 董鹏宇 YU Kuncan;XIANG Xin;WANG Peng;DONG Pengyu(Aviation Engineering School,Air Force Engineering University,Xi’an 710038,China)

机构地区：[1]空军工程大学航空工程学院,西安710038

出　　处：《空军工程大学学报》2023年第5期95-101,共7页Journal of Air Force Engineering University

基　　金：空军工程大学研究生创新实践基金(CXJ2022006)。

摘　　要：针对复杂情况下低空无线信道特性,选取近山地城镇环境视距和非视距2个场景在2.4GHz频率下开展实地低空无线信道测量活动,分别收集1200组信道的多径幅度值,结合统计性方法分析其对应的均方根时延扩展与莱斯因子2种小尺度衰落特性,并进行拟合。测试结果表明:2种场景的均方根时延扩展平均值分别为255ns、1429ns,莱斯K因子平均值分别为3.8dB、0.32dB,前者莱斯K因子大于0dB的比例为58.68%,说明该环境下莱斯信道为主;后者大于0dB的比例为10.16%,说明该环境下瑞利信道为主;拟合的结果表明:均方根时延扩展Gamma拟合,莱斯K因子正态拟合,最后得出了对应的概率密度分布函数。Under condition of complex conditions, this test is made, and two campus scenes are selected for field being at low-altitude wireless channel measurement with 2.4 GHz frequency. Multi-path amplitude values of 1 200 groups and 1 200 groups of channels are collected respectively. The corresponding root-mean-square time delay extension and Rice factor of the two small-scale fading characteristics are analyzed with statistical methods, and the fitting is made up. The test results show that the average root-mean-square delay spread of the two scenarios is 255 ns and 1 429 ns respectively, and the average Rice K factor is 3.8 dB and 0.32 dB respectively, and the ratio of the former Rice K factor being greater than 0 dB is 58.68%, indicating that the Rice channel is the main channel in this environment. The proportion of the latter being greater than 0 dB is 10.16%, indicating that Rayleigh channel is the main channel in this environment. The fitting results show that the root mean square delay extension is a Gamma fitting, and the Rice K factor is a normal fitting, and the probability density distribution functions of the two characteristics are obtained.

关 键 词：低空信道 均方根时延 莱斯K因子 

分 类 号：TN929.5[电子电信—通信与信息系统]