Full Text:  <944>

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CLC number: TN927

On-line Access: 2025-07-02

Received: 2024-01-14

Revision Accepted: 2025-07-02

Crosschecked: 2024-05-16

Cited: 0

Clicked: 1282

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Qingquan LIU

https://orcid.org/0009-0002-1761-5602

Lihu CHEN

https://orcid.org/0000-0002-9160-1981

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Frontiers of Information Technology & Electronic Engineering 

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A novel frequency-protection interval adjustment method based on Doppler frequency offset pre-compensation for space-based Internet of Things


Author(s):  Qingquan LIU, Lihu CHEN, Songting LI, Yiran XIANG, Baokang ZHAO

Affiliation(s):  College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China; more

Corresponding email(s):  liuqq_wy2022@163.com, chenlihu05@nudt.edu.cn

Key Words:  Protection interval; Spectrum utilization; Doppler frequency offset pre-compensation; Massive user access


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Qingquan LIU, Lihu CHEN, Songting LI, Yiran XIANG, Baokang ZHAO. A novel frequency-protection interval adjustment method based on Doppler frequency offset pre-compensation for space-based Internet of Things[J]. Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/FITEE.2400033

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Abstract: 
To meet the access demands of massive terminal users, the space-based Internet of Things (IoT) requires sufficient frequency resources for allocation. However, the frequency resources that are currently available have already been allocated to a great extent. Furthermore, the utilization rate of the allocated frequency resources is low. To support massive user access under restricted frequency resources, this work proposes a scheme based on Doppler frequency offset (DFO) pre-compensation to enhance spectrum utilization efficiency. By calculating the relative motion between the satellite and the transmitting terminal, combined with the length and transmission rate of the message, the optimal compensation value of the Doppler frequency deviation is determined. The frequency-protection interval is reduced. Simulation results show that the pre-compensation method can expand the user access volume by 90–400 times. Properly selecting the number of message splits and transmission rate to perform DFO pre-compensation calculations can increase user access by an additional 45% or more. This method improves the spectrum utilization efficiency and provides a solution to the challenge of access by a large number of users.

基于天基物联网多普勒频率偏移预补偿的新型频率保护间隔调整方法

刘清全1,陈利虎1,李松亭1,向怡然1,赵宝康2
1国防科技大学空天科学学院,中国长沙市,410073
2国防科技大学计算机学院,中国长沙市,410073
摘要:为满足海量终端用户的接入需求,天基物联网需要足够的频率资源用于分配。然而,目前可用的频率资源几乎已经分配完毕。而已分配的频率资源却存在频谱利用率低的问题。为在频谱资源受限的条件下实现更多用户入网,本文提出一种基于多普勒频率偏移预补偿的频率保护间隔调整方法,以提高频谱资源的利用率。通过计算卫星与信号发射终端之间的相对运动,结合报文长度和传输速率,确定多普勒频率偏移的最佳预补偿值,减小频率保护间隔。仿真结果表明,该预补偿方法可将用户访接入量增大90-400倍。合理地选择报文拆分次数和传输速率进行多普勒频率偏移预补偿计算,用户接入量还可额外增加45%或更多。本文提出的调整频率保护间隔的方法提高了频谱利用率,为解决频率受限条件下海量用户接入的难题提供了解决方案。

关键词组:保护间隔;频谱利用率;多普勒频率偏移预补偿;海量用户接入

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