低轨卫星物联网体系架构及关键技术研究

doi:10.11959/j.issn.2096-8930.2021038

Abstract

Abstract:

First, we analyzed the composition and demand characteristics of LEO satellite IoTs, and designed an architecture of LEO satellite IoTs.Second, to extracted characteristics of electromagnetic environment and channel, we studied electromagnetic environment and channel sensing methods through constructing neural network model.Then, we investigated an active terminal-identifi cation method for detecting active terminals.Finally, considered multiple-input multiple-output as the main approach to improved the capacity of terrestrial mobile communication systems, we explored a pair of algorithms of mining satellite spatial resources for realizing the collision mitigation and capacity improvement of LEO IoT terminals.Simulation results showed that the designed method sofmining spatial-domain resources could mitigated eff ectively signal collisions among IoT terminals, and improved signifi cantly the concurrent accessing number of LEO satellite IoT terminals.

Key words: low earth orbit satellite internet of things, active terminal identifi cation, spatial resource mining, collision mitigation

CLC Number:

TP927

Xiaojin DING, Tao HONG, Rui LIU, Wentao PENG, Gengxin ZHANG. Research on Architecture of LEO Satellite Internet of Things and Key Technologies[J]. Space-Integrated-Ground Information Networks, 2021, 2(4): 10-18.

Figures/Tables 11

References 24

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参数	参数值
划分区域	北纬26°～北纬38°、东经100°～东经115°
网格划分精度	纬度间隔2°、经度间隔2.5°
波束个数	4个
总节点数	20 000～30 000个
节点业务到达模型	服从Beta分布
产生新业务的时间	100个时隙
可用前导码个数	128个
前导码冲突的节点退避方式	均匀退避算法
退避窗口长度	50个时隙
时隙长度	16 ms

Research on Architecture of LEO Satellite Internet of Things and Key Technologies

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