低轨卫星物联网体系架构及关键技术研究  

Research on Architecture of LEO Satellite Internet of Things and Key Technologies

作　　者：丁晓进 洪涛[2,3] 刘锐[2,3] 彭文滔[2,3] 张更新 DING Xiaojin;HONG Tao;LIU Rui;PENG Wentao;ZHANG Gengxin(College of Internet of Things,Nanjing University of Post and Telecommunications,Nanjing 210003,China;College of Telecommunications,Information Engineering,Nanjing University of Post and Telecommunications,Nanjing 210003,China;Satellite Communication Research Institute,Nanjing University of Post and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学物联网学院,江苏南京210003 [2]南京邮电大学通信与信息工程学院,江苏南京210003 [3]南京邮电大学卫星通信研究所,江苏南京210003

出　　处：《天地一体化信息网络》2021年第4期10-18,共9页Space-Integrated-Ground Information Networks

基　　金：国家自然科学基金资助项目(No.62171234,No.91738201,No.61971440,No.U21A20450);江苏省前沿引领技术基础研究专项(No.BK20192002)。

摘　　要：首先分析低轨卫星物联网的系统组成和需求特征,并设计低轨卫星物联网的体系架构;其次,研究电磁和传播环境感知方法,通过构建神经网络模型智能提取电磁环境和信道特征;再次,探究活跃终端身份辨识方法,以检测异步接入活跃终端身份;最后,考虑多输入多输出技术作为地面移动通信系统提升容量的主要手段,探索两种卫星空间域资源挖掘算法,以实现低轨卫星物联网终端碰撞减缓和容量提升。仿真结果表明,所设计的空间域资源挖掘方法可有效减缓终端间信号碰撞,显著提升低轨卫星物联网终端并发接入容量。First,we analyzed the composition and demand characteristics of LEO satellite IoTs,and designed an architecture of LEO satellite IoTs.Second,to extracted characteristics of electromagnetic environment and channel,we studied electromagnetic environment and channel sensing methods through constructing neural network model.Then,we investigated an active terminal-identifi cation method for detecting active terminals.Finally,considered multiple-input multiple-output as the main approach to improved the capacity of terrestrial mobile communication systems,we explored a pair of algorithms of mining satellite spatial resources for realizing the collision mitigation and capacity improvement of LEO IoT terminals.Simulation results showed that the designed method sofmining spatial-domain resources could mitigated eff ectively signal collisions among IoT terminals,and improved signifi cantly the concurrent accessing number of LEO satellite IoT terminals.

关 键 词：低轨卫星物联网 活跃终端辨识 空域资源挖掘 碰撞减缓 

分 类 号：TP927[自动化与计算机技术]