Interleaved-LoRa Transmission Scheme for Satellite IoT

Jin LUO; Jiabao XIA; Yang BAI; Baoming BAI

doi:10.11959/j.issn.2096-8930.2023011

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Interleaved-LoRa Transmission Scheme for Satellite IoT

Applications | 更新时间：2024-06-03

- Interleaved-LoRa Transmission Scheme for Satellite IoT
- Space-Integrated-Ground Information Networks Vol. 4, Issue 1, Pages: 89-97(2023)
- 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：
- 基金信息：
- DOI：10.11959/j.issn.2096-8930.2023011
  CLC： TP393
- Online First：2023-03，
  
  Published：20 March 2023
- 稿件说明：
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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：

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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