无线电工程2025，Vol.55Issue(8)：1580-1589,10.DOI:10.3969/j.issn.1003-3106.2025.08.004
基于LoRa卫星下行链路的误符号率分析
Analysis of Symbol Error Rate in LoRa Satellite Downlink
摘要
Abstract
In recent years,Low-Power Wide-Area Network(LPWAN)technologies have demonstrated significant advancements in Low Earth Orbit(LEO)satellite communications.Long Range(LoRa),as a representative LPWAN technology,has garnered increasing attention in satellite internet of things communications owing to its advantages in low power consumption and extensive coverage.However,the downlink of LoRa modulation systems is susceptible to demodulation errors in low Signal to Noise Ratio(SNR)environments,significantly compromising data transmission reliability.This study addresses the Symbol Error Rate(SER)performance of LoRa satellite communication systems in Rician channels via theoretical derivation and model analysis.A closed-form SER expression for Line of Sight(LOS)signals is derived to analyze the interference mechanism of Non Line of Sight(NLOS)multipath components on LOS signal demodulation.An SER optimization model based on interference threshold is proposed to reveal system performance limits in low-SNR environments.Simulation results validate that the closed-form expression accurately characterizes the correlation between NLOS interference and LOS signal SER,while the optimization model enhances demodulation reliability in low-SNR scenarios,providing theoretical and design guidance for LoRa deployment in satellite IoT networks.关键词
Rician信道/概率模型/阈值设计/误符号率Key words
Rician channel/probabilistic model/threshold design/SER分类
信息技术与安全科学引用本文复制引用
刘侠,陈楠..基于LoRa卫星下行链路的误符号率分析[J].无线电工程,2025,55(8):1580-1589,10.基金项目
国家自然科学基金重点项目(52331012) （52331012）
国家自然科学基金面上项目(52471379) National Natural Science Foundation of China(Key Program)(52331012) （52471379）
National Natural Science Foundation of China(General Program)(52471379) （General Program）
