摘要
米波作为5G通信的重要核心技术,具有广阔的发展前景。随着通信频率的提升,天气(尤其是降雨环境)对信号传播的影响日益增大。为了建立准确有效的传播信道模型,针对降雨环境下车对基站移动通信场景,提出了基于25GHz,30GHz和78GHz的三维毫米波的MIMO空间信道模型。首先介绍了雨滴的几何物理特性,然后对雨衰工程模型作了简要描述,在此基础上提出关于本模型的动态雨衰衰减表达式。该模型考虑了基站与信号接收机的视距与非视距路径,以及接收机运动和动态散射簇对信道在时域和空间域上的非平稳性。最后采用生灭过程对信道进行理论分析,推导频率、降雨量、俯仰角等参数对互相关函数以及信道容量的影响。通过与以往文献实测数据的对比发现,该模型与实际测量结果拟合程度高。该研究对降雨环境下无线通信系统的应用具有重要的理论和实际意义,丰富了移动无线通信信道模型的研究和应用。
Millimeter wave is an important core technology of 5G communication,which has a broad development prospect.With the improvement of communication frequency,the influence of weather on signal transmission is increasing,especially in rainfall environment.In order to establish an accurate and effective communication channel model,a three-dimensional millimeter wave MIMO spatial channel model based on 25 GHz,30 GHz and 78 GHz is proposed for the base station mobile communication scena-rio in rainfall environment.In this paper,the geometric and physical characteristics of raindrops are introduced,and then the rain failure engineering model is briefly described.On this basis,the expression of dynamic rain attenuation is proposed.The model considers the non-stationary channel in time and space domain by the line-of-sight distance and non-line-of-sight path of base station and signal receiver,as well as the non-stationary of receiver motion and dynamic scattering cluster.Finally,the channel is theoretically analyzed by birth death process,and the effects of frequency,rainfall,pitch angle and other parameters on the cross-correlation function and channel capacity are deduced.The influence of pitch angle and other parameters on the correlation function and channel capacity is found to be highly fitting with the actual measurement results by comparing with the measured data in the previous literatures.The research has important theoretical and practical significance for the application of wireless communication system in rainfall environment,which extends the research and application of mobile wireless communication channel model.
作者
吴苏洁
周杰
王学英
吕智康
邵根富
WU Su-jie;ZHOU Jie;WANG Xue-ying;LYU Zhi-kang;SHAO Gen-fu(School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;Faculty of Electronic and Electrical Engineering,Niigata University,Niigata 950-2181,Japan;School of Automation,Hangzhou Dianzi University,Hangzhou 310018,China)
出处
《计算机科学》
CSCD
北大核心
2022年第7期297-303,共7页
Computer Science
基金
国家自然科学基金面上项目(61771248,61971167)。
关键词
降雨环境
毫米波
MIMO系统
互相关函数
生灭过程
Rainfall environment
Millimeter wave
MIMO system
Cross-correlation function
Birth death process
