摘要
微波通信技术是现代无线通信中的一个重要领域,但大气湍流效应导致系统性能恶化。基于Rytov近似理论和gamma-gamma分布模型推导出中断概率的表达式。在弱湍流和中强湍流2种情况下研究大气湍流和其他参数对通信系统中断概率的影响,并分析大气湍流信道下的微波通信的性能。通过对中断概率模型的仿真可知：弱湍流和强湍流下,中断概率的值与通信系统信噪比成反比,与内尺度的大小成正比,在相同性噪比下,球面波比平面波对应的中断概率值要小。该模型为研究自由空间微波通信系统提供了理论参考。
Microwave wireless communication technology is an important field in modern communication.However,atmospheric turbulence can degrade the performance of communication systems.The paper derived the expression of outage probability by using Rytov approximation theory and gamma-gamma distribution model.Then compared the influence caused by atmospheric conditions and other parameters in communication system on outage probability with weak and strong turbulences.And analyze the performance of microwave communication under atmospheric turbulence channel.The results indicate that the value of the outage probability is proportional to the signal-to-noise ratio and inversely proportional to the inner scale size under weak and strong turbulences,At the same signal-to-noise ratio,spherical wave has a smaller outage probability than plane wave.It is helpful to the research of free space microwave communication.
作者
杨柳
赵恒凯
Yang Liu;Zhao Hengkai(School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200072,China)
出处
《电子测量技术》
2018年第15期57-61,共5页
Electronic Measurement Technology
基金
国家自然科学基金(61271061
61132003)项目资助
关键词
微波通信
大气湍流
中断概率
闪烁指数
内尺度
microwave communication
atmospheric turbulence
outage probability
scintillation index
inner scale
