对流层散射超视距信道传输损耗快慢衰落特性研究  

Study on Tropospheric Scatter Beyond-line-of-sight Channel Transmission Loss for Short-term and Long-term Fading

作　　者：卫佩佩 杜晓燕[1] 江长荫[2] WEI Peipei;DU Xiaoyan;JIANG Changyin(School of Information Systems Engineering, PLA Information Engineering University, Zhengzhou 450002, China;China Research of Institute of Radiowave Propagation, Xinxiang 453003, China)

机构地区：[1]解放军信息工程大学信息系统工程学院,郑州450002 [2]中国电波传播研究所,新乡453003

出　　处：《电子与信息学报》2018年第7期1745-1751,共7页Journal of Electronics & Information Technology

摘　　要：对流层散射通信是一种地面微波超视距传播的重要手段。针对现有对流层散射传输损耗预测模型无法描述大气环境等因素随机变化问题,该文基于电场强度的快慢衰落特性,首次开展了传输损耗的快慢衰落特性研究,建立了传输损耗分布模型,并结合ITU-R P.617-3给出了该分布待定参数的计算方法。选取了国际电信联盟公布的部分散射链路试验数据,借助正态分布的坐标图纸,验证了该分布模型的有效性,结果表明传播损耗慢衰落特性服从正态分布,可为下一步计算散射链路误码率奠定基础。此外,基于分布模型还提出一种传输损耗预测方法,并利用试验数据验证了所提方法具有较好的精度,克服了现有方法无法计算任意概率传输损耗的问题。Tropospheric scatter （Troposcatter） communication is an important means for ground microwave beyond-line-of-sight propagation. Available troposcatter transmission loss models are inefficient to describe the random variables resulting from atmosphere environment and other factors. Therefore, this paper studies the short-term fading and long-term fading characteristics of transmission loss based on those of electric field strength for the first time. The distribution model of transmission loss is modeled, whose parameters are estimated referring to ITU-R P.617-3. Parts of measured scatter links data from International Telecommunication Union （ITU） are chosen to verify this model with normal distribution graph. The result shows that the long-term fading of transmission obeys the normal distribution. It gives the basis of calculating error bit for the further work. In addition, a transmission loss prediction method is proposed based on its distribution model. It is verified to have a good accuracy using measured data, and this method address the problem that available transmission loss methods can not predict the values at any time percentages.

关 键 词：对流层散射通信 超视距传播 传输损耗快慢衰落特性 正态分布 

分 类 号：TN929.2[电子电信—通信与信息系统]