面向卫星物联网的交织LoRa传输方案

doi:10.11959/j.issn.2096-8930.2023011

天地一体化信息网络 ›› 2023, Vol. 4 ›› Issue (1): 89-97.doi: 10.11959/j.issn.2096-8930.2023011

面向卫星物联网的交织LoRa传输方案

罗进¹, 夏家宝¹, 白杨¹, 白宝明¹

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

修回日期:2023-01-20 出版日期:2023-03-20 发布日期:2023-03-01
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
基金资助:
国家自然科学基金资助项目(62171356);国家重点研发计划资助项目(2021YFB2900501)

Interleaved-LoRa Transmission Scheme for Satellite IoT

Jin LUO¹, Jiabao XIA¹, Yang BAI¹, Baoming BAI¹

¹ State Key Laboratory of ISN, Xidian University, Xi'an 710071, China
² Guangzhou Institute of Technology, Xidian University, Guangzhou 510555, China

Revised:2023-01-20 Online:2023-03-20 Published:2023-03-01
Supported by:
The National Natural Science Foundation of China(62171356);National Key Research＆Development Program of China(2021YFB2900501)

摘要/Abstract

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%。

关键词: 卫星物联网, Turbo码, LoRa, ICS-LoRa, SSK-ICS-LoRa

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.

Key words: satellite IoT, Turbo code, LoRa, ICS-LoRa, SSK-ICS-LoRa

中图分类号:

TP393

罗进, 夏家宝, 白杨, 白宝明. 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, Baoming BAI. Interleaved-LoRa Transmission Scheme for Satellite IoT[J]. Space-Integrated-Ground Information Networks, 2023, 4(1): 89-97.

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参数	值
带宽/kHz	125
信道	AWGN
编码方案	Turbo码
扩频因子	13
正交啁啾数/个	8 192
目标信噪比（@BER=10^-5）	-26 dB

调制方式	P_Rx/dBm	SNR_limit/dB	传输距离/km
LoRa	-140.5	-23.5	4 135
ICS-LoRa（x=1 bit）	-140.4	-23.4	4 088
ICS-LoRa（x=2 bit）	-140.2	-23.2	3 995
ICS-LoRa（x=3 bit）	-140	-23	3 904
SSK-ICS-LoRa	-140.2	-23.2	3 995
ICS-LoRa （x=1 bit，Turbo编码）	-144.3	-27.3	6 405
ICS-LoRa （x=2 bit，Turbo编码）	-144.1	-27.1	6 259
ICS-LoRa （x=3 bit，Turbo编码）	-143.8	-26.8	6 047
SSK-ICS-LoRa （x=2 bit，Turbo编码）	-144.1	-27.1	6 259

面向卫星物联网的交织LoRa传输方案

Interleaved-LoRa Transmission Scheme for Satellite IoT

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