LoRa调制在低轨卫星物联网下适应性研究  

Adaptability of LoRa modulation in LEO satellite internet of things

作　　者：吴庭薇 谢继东[1] 张更新 WU Tingwei;XIE Jidong;ZHANG Gengxin(National Local Joint Engineering Research Center for Communication and Network Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与网络技术国家工程研究中心,江苏南京210003

出　　处：《电视技术》2018年第9期21-25,36,共6页Video Engineering

基　　金：国家自然科学基金(91738201)

摘　　要：LoRa (Long Range)有着低功耗、广覆盖的优点,是目前地面物联网发展最具前景的技术之一。在分析地面物联网中LoRa性能的基础上,本文研究了LoRa在低轨卫星物联网下的性能。先仿照LEO系统(铱星)的仿真系数,得出LoRa在有高斯白噪声的莱斯信道模型下的性能,然后分析比较了LoRa体制在不同多普勒残余频差、扩频因子和发射功率下的性能,仿真结果表明,LoRa调制可满足系统的吞吐量要求。因此在本文的仿真条件下,LoRa调制可以满足低轨卫星物联网场景下的性能要求。LoRa （Long Range） technology which is one of the most promising technologies of ground -based IoT has the advantages of low- power consumption and wide coverage. Based on the analysis of LoRa performance in terrestrial internet of things, the paper studied the performance of LoRa in LEO satellite Internet of Things. Firstly, imitating the simulation coefficients of the LEO system （comet） , the paper obtained the performance of LoRa in Rieian channel model which added Gaussian white noise. Then, the paper analyzed and compared the performance of LoRa system under different Doppler residual frequency difference, spreading factor and transmit power. Simulation results show that LoRa modulation can meet the system＇s throughput requirements. So, under the simulation conditions of this paper, LoRa modulation can meet the performance requirements of low - orbit satellite IoT scenarios.

关 键 词：地面物联网 LoRa 低轨卫星物联网 残余频偏 自适应速率 

分 类 号：TN927.2[电子电信—通信与信息系统]