Receiver Synchronization and Nonconherent Soft Demodulation Scheme for LoRa-Based Satellite IoT Systems

YU Zhong-yang; GAO Ji-xun; GUO Xiao-bo; LI Bo; HE Li; HUANG Zhi-guo

doi:10.12263/DZXB.20220118

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Receiver Synchronization and Nonconherent Soft Demodulation Scheme for LoRa-Based Satellite IoT Systems

PAPERS | 更新时间：2025-12-08

- Receiver Synchronization and Nonconherent Soft Demodulation Scheme for LoRa-Based Satellite IoT Systems
- ACTA ELECTRONICA SINICA Vol. 51, Issue 5, Pages: 1291-1299(2023)
- 作者机构：
  
  1.河南工程学院计算机学院、河南省智慧城市多模态智能交互系统工程研究中心,河南郑州 451191
  2.西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安 710071
- 作者简介：
- 基金信息：
- DOI：10.12263/DZXB.20220118
  CLC： TN911.23
- Received：25 January 2022，
  
  Revised：2022-06-16，
  
  Published：25 May 2023
- 稿件说明：
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余忠洋,高继勋,郭小波等.基于LoRa的卫星物联网系统接收机同步与非相干软解调方案[J].电子学报,2023,51(05):1291-1299.

YU Zhong-yang,GAO Ji-xun,GUO Xiao-bo,et al.Receiver Synchronization and Nonconherent Soft Demodulation Scheme for LoRa-Based Satellite IoT Systems[J].ACTA ELECTRONICA SINICA,2023,51(05):1291-1299.
余忠洋,高继勋,郭小波等.基于LoRa的卫星物联网系统接收机同步与非相干软解调方案[J].电子学报,2023,51(05):1291-1299. DOI： 10.12263/DZXB.20220118.

YU Zhong-yang,GAO Ji-xun,GUO Xiao-bo,et al.Receiver Synchronization and Nonconherent Soft Demodulation Scheme for LoRa-Based Satellite IoT Systems[J].ACTA ELECTRONICA SINICA,2023,51(05):1291-1299. DOI： 10.12263/DZXB.20220118.

摘要

LoRa（Long Range）技术是一种改进的高阶啁啾扩频（Chirp Spread Spectrum，CSS）调制技术，如今已经成为了地面物联网（Internet of Things，IoT）的主流调制技术之一.不同于地面物联网，卫星IoT将会实现全球范围内的无缝覆盖，但其通信距离遥远和高速移动使得接收机通常工作在极低信噪比下并面临较大时延和多普勒频移.鉴于此，本文将LoRa技术应用到卫星IoT系统中并研究相应的接收机同步与非相干软解调方案.首先给出了卫星IoT上行链路的系统模型和数据帧结构.接着根据LoRa信号的特点，设计了一种联合时延与多普勒频移估计方案.为了进一步消除相偏和其他残留项的影响以及考虑采用基于软判决译码的编码方案，又设计了一种低复杂度的非相干软解调算法.仿真结果表明基于所提同步方案和软解调算法的turbo-LoRa系统可以在极低信噪比和较小导频开销下获得接近于理想情况的误码性能，且在BER=10

-5

下优于Hamming-LoRa系统3dB.

Abstract

LoRa (Long Range) technique is an improved high-order chirp spread spectrum (CSS) modulation technique

and becomes one of the mainstream modulation techniques for terrestrial internet of things (IoT). Different from the terrestrial IoT

satellite IoT can achieve seamless global coverage

however

the corresponding receiver often works under the extremely-low signal-to-noise ratio (SNR) and also faces large delay and Doppler shift due to long distance and high-speed movement. To this end

this paper applies the LoRa technique to satellite IoT systems and studies the relevant receiver synchronization as well as noncoherent soft demodulation scheme. First

considered system model and data frame structure of the uplink satellite IoT are given. Then

according to the feature of LoRa signals

a joint delay and Doppler shift estimation scheme is proposed. In order to further eliminate the impact of the phase offset as well as other residual terms and consider using soft-decision decoding based coding schemes

a low-complexity noncoherent soft demodulation algorithm is also designed. Simulation results show that the turbo-LoRa system based on the proposed synchronization scheme and soft demodulation algorithm can achieve near ideal error performance under extremely low SNR and small pilot overhead

and can provide 3dB gains over the Hamming-LoRa system at a bit error rate (BER) of 10

-5

关键词

Keywords

references

YOU X , WANG C , HUANG J , et al . Towards 6G wireless communication networks: Vision, enabling technologies, and new paradigm shifts [J]. Science China Information Sciences , 2021 , 64 : 1 - 74 .

ZHANG Z , XIAO Y , MA Z , et al . 6G wireless networks: Vision, requirements, architecture, and key technologies [J]. IEEE Vehicular Technology Magazine , 2019 , 14 ( 3 ): 28 - 41 .

CHEN S , SUN S , KANG S . System integration of terrestrial mobile communication and satellite communication-the trends, challenges and key technologies in B5G and 6G [J]. China Communications , 2020 , 17 ( 12 ): 156 - 171 .

GEORGIOU O , RAZA U . Low power wide area network analysis: Can LoRa scale? [J]. IEEE Wireless Communications Letters , 2017 , 6 ( 2 ): 162 - 165 .

吴进 , 赵新亮 , 赵隽 . LoRa物联网技术的调制解调 [J]. 计算机工程与设计 , 2019 , 40 ( 03 ): 617 - 622 .

WU Jin , ZHAO Xin-liang , ZHAO Jun . Modulation and demodulation of LoRa internet of things technology [J]. Computer Engineering and Design , 2019 , 40 ( 3 ): 617 - 622 . (in Chinese)

TAPPAREL J , AFISIADIS O , MAYORAZ P , et al . An open-source LoRa physical layer prototype on GNU radio [C]// 2020 IEEE 21st International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) . Piscataway : IEEE , 2020 : 1 - 5 .

COLAVOLPE G , FOGGI T , RICCIULLI M , et al . Reception of LoRa signals from LEO satellites [J]. IEEE Transactions on Aerospace and Electronic Systems , 2019 , 55 ( 6 ): 3587 - 3602 .

SAVAUX V , DELACOURT C , SAVELLI P . On time-frequency synchronization in LoRa system: From analysis to near-optimal algorithm [J]. IEEE Internet of Things Journal , 2022 , 9 ( 12 ): 10200 - 10211 .

VANGELISTA L , CATTAPAN A . Start of packet detection and synchronization for LoraWAN modulated signals [J]. IEEE Transactions on Wireless Communications , 2022 , 21 ( 6 ): 4608 - 4621 .

XHONNEUX M , AFISIADIS O , BOL D , et al . A low-complexity LoRa synchronization algorithm robust to sampling time offsets [J]. IEEE Internet of Things Journal 2022 . 9 ( 5 ): 3756 - 3769 .

BARUFFA G , RUGINI L , MECARELLI V , et al . Coded LoRa performance in wireless channels [C]// 2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) . Piscataway : IEEE , 2019 : 1 - 6 .

徐浪 , 陈小莉 , 田茂 , 等 . 基于Turbo码和ODPD判决法的LoRa改进方法 [J]. 电子测量技术 , 2020 , 43 ( 7 ): 142 - 147 .

XU Lang , CHEN Xiao-li , TIAN Mao , et al . Improving method of LoRa based on Turbo code and ODPD [J]. Electronic Measurement Technology , 2020 , 43 ( 7 ): 142 - 147 . (in Chinese)

沈越泓 , 益晓新 . 基于MMSE准则的最佳相干FSK解调器 [J]. 电子学报 , 2000 , 28 ( 4 ): 43 - 45 .

SHEN Yue-hong , YI Xiao-xin . A novel FSK demodulator using MMSE criterion [J]. Acta Electronica Sinica , 2000 , 28 ( 4 ): 43 - 45 . (in Chinese)

VANGELISTA L . Frequency shift chirp modulation: The LoRa modulation [J]. IEEE Signal Processing Letters , 2017 , 24 ( 12 ): 1818 - 1821 .

FABREGAS A G I , GRANT A J . Capacity approaching codes for non-coherent orthogonal modulation [J]. IEEE Transactions on Wireless Communications , 2007 , 6 ( 11 ): 4004 - 4013 .

Alliance LoRa . LoRaWAN Specification [EB/OL]. [ 2022- 01-25 ]. https://lora-alliance.org/resource_hub/what-is-lora wan https://lora-alliance.org/resource_hub/what-is-lorawan .

YU Z , BAI B , ZHU M . An efficient frame optimization scheme for low power wide area networks [J]. IEEE Communications Letters , 2021 , 25 ( 5 ): 1615 - 1619 .

孙锦华 , 石静静 . iNET系统多径衰落信道下的两步频偏估计算法 [J]. 电子学报 , 2019 , 47 ( 7 ): 1506 - 1511 .

SUN Jin-hua , SHI Jing-jing . A two step frequency offset estimation algorithm using the iNET preamble in multipath fading channels [J]. Acta Electronica Sinica , 2019 , 47 ( 7 ): 1506 - 1511 . (in Chinese)

CHIANI M , ELZANATY A . On the LoRa modulation for IoT: Waveform properties and spectral analysis [J]. IEEE Internet of Things Journal , 2019 , 6 ( 5 ): 8463 - 8470 .

VOGT J , FINGER A . Improving the max-log-MAP turbo decoder [J]. Electronics Letters , 2000 , 36 ( 23 ): 1937 - 1939 .

3rd Generation Partnership Project . Technical Specification Group Radio Access Network: Evolved Universal Terrestrial Radio Access (E-UTRA): Multiplexing and Channel Coding: 3GPP TS 36.212 V9.2.0 [S]. 2010 : 13 - 14 .

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