低轨卫星通信系统的时频联合同步算法研究*

doi:10.7523/j.ucas.2024.053

中国科学院大学学报

低轨卫星通信系统的时频联合同步算法研究^*

李燕萍^1,2,3, 尚琳⁴, 李国通^1,2,3,4†

1 中国科学院微小卫星创新研究院,上海 201304;
2 中国科学院大学,北京 100049;
3 上海科技大学,上海 201210;
4 上海垣信卫星科技有限公司,上海 201600

收稿日期:2024-02-23 修回日期:2024-05-20 发布日期:2024-06-11
通讯作者: ^†E-mail: ligt@microsate.com
基金资助:
^*国家自然科学基金(U21A20443)资助

Research on joint timing and frequency synchronization algorithms of LEO satellite communication system

LI Yanping^1,2,3, SHANG Lin⁴, LI Guotong^1,2,3,4

1 Innovation Academy for Microsatellites of Chinese Academy of Sciences, Shanghai 201304, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 ShanghaiTech University, Shanghai 201210, China;
4 Shanghai Yuanxin Satellite Technology Co., Ltd, Shanghai 201600, China

Received:2024-02-23 Revised:2024-05-20 Published:2024-06-11

摘要/Abstract

摘要： 低轨卫星融合5G的移动通信系统具有广阔的应用前景,为保障用户与基站之间的通信链路的有效建立和数据的可靠传输,时频同步技术至关重要。传统的时频同步算法对毫米波频段、大带宽、高多普勒频移及变化率、低信噪比的低轨卫星信道的适用程度有限,导致估计精度下降。针对采用5G体制的低轨卫星通信系统上行业务数据信道,提出了一种基于加权内置同步序列的时频联合同步算法,提高了时频偏估计精度。通过仿真实验对比可得,所提时频联合同步算法相比传统算法在具有相同复杂度的同时,具有更优良的综合同步性能。

关键词: 低轨卫星通信, OFDM, 时间同步, 频率同步

Abstract: The integration of low orbit satellite (LEO) with 5G in the mobile communication system presents extensive application prospects. To ensure effective establishment of communication links between users and base stations, as well as reliable data transmission, time-frequency synchronization technology plays a crucial role. However, traditional timing and frequency synchronization algorithms face limitations when dealing with millimeter wave frequency bands, large bandwidths, high Doppler frequency shifts and change rates, and low signal-to-noise ratios in low orbit satellite channels. These limitations result in decreased estimation accuracy. For the uplink service data channel of a 5G-based low orbit satellite communication system, a joint timing and frequency synchronization algorithm based on weighted built-in synchronization sequences is proposed to improve the accuracy of timing and frequency offset estimation. Simulation results demonstrate that the proposed timing and frequency synchronization algorithm outperforms traditional algorithms with comparable complexity in terms of synchronization performance.

Key words: LEO satellite communication, OFDM, timing synchronization, frequency synchronization

中图分类号:

TN927+.23

李燕萍, 尚琳, 李国通. 低轨卫星通信系统的时频联合同步算法研究^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2024.053.

LI Yanping, SHANG Lin, LI Guotong. Research on joint timing and frequency synchronization algorithms of LEO satellite communication system[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2024.053.

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低轨卫星通信系统的时频联合同步算法研究^*

Research on joint timing and frequency synchronization algorithms of LEO satellite communication system

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