面向卫星物联网的交织LoRa传输方案

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面向卫星物联网的交织LoRa传输方案

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- 面向卫星物联网的交织LoRa传输方案
- Interleaved-LoRa Transmission Scheme for Satellite IoT
- 天地一体化信息网络 2023年4卷第1期页码：89-97
- 作者机构：
  
  1. 西安电子科技大学空天地一体化综合业务网全国重点实验室，陕西西安 710071
  2. 西安电子科技大学广州研究院，广东广州 510555
- 作者简介：
  
  [ "罗进（1999-），男，西安电子科技大学广州研究院硕士生，主要研究方向为卫星物联网传输技术" ]
  [ "夏家宝（1998-），男，西安电子科技大学通信工程学院硕士生，主要研究方向为编码调制技术、物联网传输技术等" ]
  [ "白杨（1999-），女，西安电子科技大学广州研究院硕士生，主要研究方向为物联网传输技术等" ]
  [ "白宝明（1966-），男，西安电子科技大学教授，博士生导师，主要研究方向为信息与编码理论、编码调制技术和无线通信" ]
- 基金信息：
  
  国家自然科学基金资助项目;The National Natural Science Foundation of China(62171356);国家重点研发计划资助项目;National Key Research＆Development Program of China(2021YFB2900501)
- DOI：10.11959/j.issn.2096-8930.2023011
  中图分类号： TP393
- 网络首发：2023-03，
  
  纸质出版：2023-03-20
- 稿件说明：
移动端阅览
罗进, 夏家宝, 白杨, 等. 面向卫星物联网的交织LoRa传输方案[J]. 天地一体化信息网络, 2023,4(1):89-97.

Jin LUO, Jiabao XIA, Yang BAI, et al. Interleaved-LoRa Transmission Scheme for Satellite IoT[J]. Space-Integrated-Ground Information Networks, 2023, 4(1): 89-97.
罗进, 夏家宝, 白杨, 等. 面向卫星物联网的交织LoRa传输方案[J]. 天地一体化信息网络, 2023,4(1):89-97. DOI： 10.11959/j.issn.2096-8930.2023011.

Jin LUO, Jiabao XIA, Yang BAI, et al. Interleaved-LoRa Transmission Scheme for Satellite IoT[J]. Space-Integrated-Ground Information Networks, 2023, 4(1): 89-97. DOI： 10.11959/j.issn.2096-8930.2023011.

摘要

卫星物联网的传输距离要比地面物联网远得多，导致其传输链路上存在较大的功率损耗，接收端的接收功率变得非常低。将性能优异的编码方案与大扩频因子的LoRa调制相结合，可以实现在极低信噪比下的可靠通信。然而，LoRa调制方案随着扩频因子的增大，频谱效率急剧降低。鉴于此，设计一种交织LoRa传输方案，在降低误比特率的同时确保较高的频谱效率。首先给出LoRa的非相干软解调算法，并对Turbo和LDPC编码的LoRa系统进行性能仿真。接着提出交织LoRa传输方案的软解调算法。仿真结果表明，在误比特率为10

-5

时，提出的Turbo编码交织LoRa传输方案相较于未编码方案性能提高了约4 dB，等价于在自由空间下的通信距离增加了55%～57%，与现

有的Turbo-LoRa方案相比，频谱效率提高了约23%。

Abstract

The transmission distance of satellite IoT is much further than terrestrial IoT

resulting in a signifi cant power loss on the transmission link.Thus the received signal power at a receiver will be signifi cantly lower.Combining a high-performance FEC coding and LoRa modulation with a signifi cant spreading factor enables reliable communication at very low signal-to-noise ratios.However

LoRa modulation dramatically decrease spectral effi ciency as the spreading factor increases.An interleaved LoRa transmission scheme that could achieved high spectral effi ciency with a low bit error rate (BER) was proposed.Firstly

a non-coherent soft demodulation algorithm was presented for LoRa and the corresponding performance comparison with the use of Turbo and LDPC codes.Then proposed a soft demodulation algorithm for interleaved-LoRa transmission.Simulation results showed that Turbo coded interleaved-LoRa system outperformed the uncoded system by about 4 dB at a BER=10

-5

which was equivalently to a 55%~57% improvement on communication distance in free space.Furthermore

the spectral effi ciency was improved by approximately 23% compared to the existing Turbo-LoRa scheme.

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references

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