基于LoRa的低轨道卫星物联网传输技术

doi:10.11959/j.issn.2096-8930.2022038

天地一体化信息网络 ›› 2022, Vol. 3 ›› Issue (4): 2-11.doi: 10.11959/j.issn.2096-8930.2022038

所属专题：卫星互联网用户接入控制

• 专题：卫星互联网用户接入控制 • 上一篇下一篇

基于LoRa的低轨道卫星物联网传输技术

李泽浩¹, 马建鹏¹, 张顺¹, 魏肖², 张景²

¹ 西安电子科技大学，陕西西安 710071
² 中国电子科学研究院，北京 100041

修回日期:2022-10-26 出版日期:2022-12-20 发布日期:2022-12-01
作者简介:李泽浩（1998-），男，西安电子科技大学硕士生，主要研究方向为物联网地面传输、LoRa无线通信
马建鹏（1990-），男，博士，西安电子科技大学副教授，主要研究方向为毫米波大规模MIMO网络、空间信息网络、下一代无线局域网、特种通信网络的物理层和链路层理论与工程应用等
张顺（1985-），男，博士，西安电子科技大学教授，博士生导师，主要研究方向为毫米波大规模MIMO智能组网、空间信息网络、新一代短距无线通信、智能超表面辅助组网技术以及无线组网验证平台等
魏肖（1991-），现就职于中国电子科学研究院，主要研究方向为星地融合网络接入技术、卫星物联网传输技术、卫星5G接入技术等
张景（1974-），现就职于中国电子科学研究院，研究员级高级工程师，主要研究方向为基于5G移动通信技术体制的卫星无线接入网技术、基于4G/5G技术体制的时敏专网、移动边缘计算技术在行业中的应用等
基金资助:
国家重点研发计划资助项目(2021YFB2900502);中央高校基本科研业务费(XJS220107)

Low Orbit Satellite Internet of Things Transmission Technology Based on LoRa

Zehao LI¹, Jianpeng MA¹, Shun ZHANG¹, Xiao WEI², Jing ZHANG²

¹ Xidian University, Xi’an 710071, China
² China Academic of Electronics and Information Technology, Beijing 100041, China

Revised:2022-10-26 Online:2022-12-20 Published:2022-12-01
Supported by:
National Key Research and Development Program of China(2021YFB2900502);Fundamental Research Funds for the Central Universities(XJS220107)

摘要/Abstract

摘要：

LoRa作为一种广域网技术，具有低功耗、广覆盖等特点，在物联网应用领域具有十分广阔的前景，近年来，已被部署在全球多个物联网中。低轨卫星网络广覆盖的优势使其成为实现海量物联网全球覆盖的必然技术。首先对LoRa技术的基本原理进行阐述；然后分析LoRa技术直接引入低轨卫星物联网后存在的问题；最后提出一套适合低轨卫星物联网的LoRa传输技术，重点解决低轨远距离低功耗传输条件下的LoRa帧同步问题和卫星高速移动导致的大多普勒频移对LoRa解调的不利影响。仿真结果表明，提出的联合同步及频偏估计算法能明显提高极低信噪比和大多普勒频移条件下LoRa技术的同步概率和传输可靠性。

关键词: 低轨卫星, 物联网, LoRa, 帧同步, 频移估计

Abstract:

As an emerging wide area network technology, LoRa has the characteristics of low power consumption and wide coverage.It has very broad prospects in the field of internet of things applications.In recent years, it has been deployed in countless objects around the world.The advantages of wide coverage of low-orbit satellite networks make it an inevitable technology to achieve global coverage of massive internet of things.Firstly, the basic principles of LoRa technology were expounded.Then the problems existed after the LoRa technology was directly introduced into the low-orbit satellite IoT were analyzed.Finally, a set of LoRa transmission technology suitable for low-orbit satellite IoT was proposed, focused on solved the problem of LoRa frame synchronization under the condition of low-orbit long-distance low-power transmission, and the problem of LoRa demodulation caused by the high-speed movement of satellites due to the Doppler frequency off set.The simulation results showed that the proposed joint synchronization and frequency off set estimation algorithm could obviously improved the synchronization probability and transmission reliability of LoRa technology under the conditions of extremely low SNR and large Doppler frequency shift.

Key words: low-orbit satellite, internet of things, LoRa, frame synchronization, frequency off set estimation

中图分类号:

TN929.5

李泽浩, 马建鹏, 张顺, 魏肖, 张景. 基于LoRa的低轨道卫星物联网传输技术[J]. 天地一体化信息网络, 2022, 3(4): 2-11.

Zehao LI, Jianpeng MA, Shun ZHANG, Xiao WEI, Jing ZHANG. Low Orbit Satellite Internet of Things Transmission Technology Based on LoRa[J]. Space-Integrated-Ground Information Networks, 2022, 3(4): 2-11.

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基于LoRa的低轨道卫星物联网传输技术

Low Orbit Satellite Internet of Things Transmission Technology Based on LoRa

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