摘要
为精确研究信道模型的空间和时间特征,提出一种基于椭圆几何并考虑降雨衰减效应的郊区密集乔木林区多阶散射信道模型。推导一阶与二阶散射系统波达信号的到达时间(TOA)和到达角(AOA)的联合概率密度函数(PDF),对该模型进行仿真。仿真结果表明,随着降雨强度的增加,经历多阶散射的波达信号到达时间将产生显著延迟,概率密度更加接近均匀分布,且阶数越高,降雨作用的影响越明显。仿真结果有利于进一步研究蜂窝通信系统功率延迟分布,推导降雨环境下的循环前缀,分析OFDM系统的性能。
To accurately study the spatial and temporal characteristics of the channel model,a multi-order scattering channel model based on elliptic geometry and considering rainfall attenuation effect in dense tree forest areas in suburbs was proposed.The joint probability density function(PDF)of arrival time(TOA)and angle of arrival(AOA)of the first-order and second-order scattering systems was derived and simulated.The results show that with the increase of rainfall intensity,the arrival time of the arrival signal of multi-order scattering is significantly delayed,the probability density is closer to uniform distribution,and the higher the order,the more obvious the effect of rainfall.The simulation results are beneficial to further study the power delay distribution of the cellular system,push the cyclic prefix in the rainfall environment,and analyze the performance of the OFDM system.
作者
周杰
岳壮
ZHOU Jie;YUE Zhuang(College of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)
出处
《计算机工程与设计》
北大核心
2020年第1期7-15,共9页
Computer Engineering and Design
基金
国家自然科学基金面上基金项目(61372128)
江苏省高校自然科学基金重大基金项目(14KJA510001)
关键词
概率密度函数
到达角
到达时间
多径效应
降雨衰减
probability density function
angle of arrival
arrival time
multipath effect
rainfall attenuation
