摘要
OFDM系统需要正确理解传播信道的时间特性,从而自适应地固定循环前缀(CP)。为此,提出了一种基于几何的单反射模型。推导了多径效应和小尺度衰落影响下的信号到达角(AOA)与到达时间(TOA)的概率密度函数(PDF),通过仿真验证了这些表达式,与文献中的参考数据进行了比较。仿真结果表明降雨强度的变化将直接影响信号直达波的TOA,而对AOA没有直接影响。仿真结果有助于进一步研究功率延迟分布和相关时间色散参数。
OFDM systems need to correctly understand the time characteristics of the propagation channel,so as to adaptively fix the cyclic prefix (CP).In this paper,a geometric single reflection model is proposed.The probability density function (PDF) of signal angle of arrival (AOA) and time of arrival (TOA) under the influence of multipath effect and small scale fading is derived.These expressions are verified by simulation and compared with the actual data in the literature.The simulation results show that the change of rainfall intensity will directly affect the TOA of direct wave,but not AOA.The simulation results are helpful to further study the power delay distribution and related time dispersion parameters.
作者
岳壮
周杰
YUE Zhuang;ZHOU Jie(College of Electronic & Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)
出处
《信息技术》
2019年第10期6-10,14,共6页
Information Technology
基金
国家自然科学基金面上基金项目(61471153,61771248)
江苏省高校自然科学基金重大基金项目(14KJA510001)
关键词
到达角
到达时间
信道脉冲响应
概率密度函数
OFDM
angle of arrival
time of arrival
channel impulse response
probability density function
OFDM
