Es层超视距通信调制解调技术研究  

Study on the Modem Technology of Sporadic E BLOS Communication

作　　者：任香凝[1] 王伟[1] 庞博[2] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]吉林大学电子科学与工程学院,长春吉林130012

出　　处：《无线电通信技术》2013年第3期39-42,共4页Radio Communications Technology

摘　　要：利用Es层对VHF电波的反射或散射作用,可以实现单跳达2 000 km的无线超视距通信。分析了在距离为1 250 km和1 495 km的2条链路试验中统计得到的Es层信道传输特性;在此基础上,对Es层超视距通信调制解调器的组成、工作原理及抗衰落、抗多径时延展宽以及速率自适应关键技术方案进行了简要介绍;并在实验室内搭建了Es层信道模型,在此信道仿真平台上测试了调制解调器的误码性能,得出了实测误码性能曲线与带内三重频率分集PSK相干检测理论曲线相差小于2 dB的测试结论。Sporadic E has a reflection or troposcatter effect on the VHF electric wave,by which a type of wireless BLOS communi- cation may be implemented, with single-hop up to 2 000 kilometres. An analysis about the channel transmission characteristics of Sporadic E derived from the test statistics of two links is first made. The distances of the two links are 1 250 kilometres and 1 495 kilometres respectively. Then a brief introduction to the composition, work principle as well as the anti-fading, anti-muhipath delay spread and rate-adaptive technology solution of the Sporadic E BLOS communication modem is offered. Furthermore,a channel model of Sporadic E is made,then bit-error-rate performance of the modem is tested on this channel simulation platform in lab,and a result is achieved that the difference is less than 2 dB between the practical test performance and the ideal performance of triad diversity in band with PSK coherent detection.

关 键 词：ES层 抗衰落 抗多径时延展宽 速率自适应 

分 类 号：TN926.4[电子电信—通信与信息系统]