摘要
在假设阴影衰落对接收信号直射分量的影响符合对数正态分布、多径衰落对接收信号的干扰符合瑞利分布的情况下 ,给出了接收信号包络变化的电平通过率和平均衰落持续时间的表达式 .利用数值分析方法给出了轻阴影、重阴影和混合阴影衰落环境下 ,平流层通信衰落信道接收信号包络的概率密度分布、电平通过率和平均衰落持续时间的数值 .
A statistical model for the fading channel of the stratospheric communication system was derived . Assuming that the amplitude of the line of sight component under shadowing is lognormally distributed and the received multipath interference has a Rayleigh distribution, the expressions for the level crossing rate and average fading duration were given. The probability density function, the level crossing rate and the average fading duration for the fading channel of the stratospheric communication system for light shadowing, heavy shadowing and overall shadowing were calculated numerically. The model in this paper has great significance on the performance simulation of the stratospheric communication systems for which no measurement data are available.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2002年第3期331-336,共6页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目 ( 6 9972 0 2 8)