面向卫星物联网的交织LoRa传输方案

doi:10.11959/j.issn.2096-8930.2023011

Abstract

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

CLC Number:

TP393

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.

Figures/Tables 13

References 26

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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

Interleaved-LoRa Transmission Scheme for Satellite IoT

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References 26

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