中国空间科学技术

中国空间科学技术 ›› 2021, Vol. 41 ›› Issue (3): 39-45.doi: 10.16708/j.cnki.1000.758X.2021.0036

• 研究探讨 • 上一篇    下一篇

基于认知无线电的GEO与LEO卫星频谱共存

胡晓月1,2，杨淼2，康凯2,3,*，张舜卿1   

  1. 1 上海大学 通信与信息工程学院，上海200444
    2 中国科学院 上海高等研究院，上海201210
    3 中国科学院 上海微系统与信息技术研究所无线传感网与通信重点实验室，上海200050
  • 收稿日期:2020-07-13 修回日期:2020-08-31 接受日期:2020-09-16 出版日期:2021-06-25 发布日期:2021-06-09
  • 通讯作者: 康凯： kangk@sari.ac.cn E-mail: kangk@sari.ac.cn
  • 作者简介:胡晓月（1995-），女，博士研究生，研究方向为卫星通信, huxiaoyue1109@163.com。 康凯（1977-）男，高级工程师，研究方向为无线通信物理层、卫星通信，kangk@sari.ac.cn。
  • 基金资助:
    国家自然科学基金（61671436）；上海市科委基金（19DZ1204304）

Coexistence of GEO and LEO satellite spectrum based on cognitive radio

HU Xiaoyue1,2，YANG Miao2，KANG Kai2,3,*，ZHANG Shunqing1   

  1. 1 School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China
    2 Shanghai Institute of Advanced Studies, Chinese Academy of Sciences, Shanghai 201210, China
    3 Key Laboratory of Wireless Sensor Networks and Communications, Shanghai Institute of Microsystem and 
    Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2020-07-13 Revised:2020-08-31 Accepted:2020-09-16 Published:2021-06-25 Online:2021-06-09
  • Contact: 康凯： kangk@sari.ac.cn E-mail: kangk@sari.ac.cn
  • Supported by:
    国家自然科学基金（61671436）；上海市科委基金（19DZ1204304）

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摘要： 随着新的宽带多媒体业务的发展，宽带无线频谱的需求日益增长。同时，低轨道（LEO）卫星由于其传输损耗低、传播时延小而被大规模部署。为了更好地利用频谱资源，卫星通信系统普遍采用高轨道（GEO）卫星与LEO卫星频谱共存的方案来提高频谱利用率。在频谱共存的过程中，提出了一种基于动态阈值的能量检测与波束跳跃相结合的算法，以减小LEO对GEO卫星的干扰。首先对LEO卫星的信噪比进行估计并实时选择最优阈值，然后利用基于动态阈值的能量检测算法对GEO卫星信号进行判别，最后根据判断的结果进行波束调整。仿真结果表明，提出的基于动态阈值的能量检测算法的检测误差明显低于传统的基于固定阈值的能量检测算法和基于二阶循环统计量的频谱感知方法。当信噪比低于-10dB的情况下，检测误差低于0.2；而当信噪比高于-5dB时，检测误差趋近于0。

关键词: 卫星通信, 认知无线电, 能量检测, 动态阈值, 波束跳跃

Abstract: With the development of new broadband multimedia services, the demand for broadband wireless spectrum has been growing rapidly, which makes spectrum resources scarcer. Meanwhile, low Earth orbit (LEO) satellites deployed on a large scale have the advantages of low transmission loss and small propagation delay. To improve the spectrum utilization rate, a coexistence scheme of geostationary Earth orbit (GEO) satellites and LEO satellites was adopted. In order to avoid the interferences of LEO satellites to GEO satellites during spectrum coexistence, an algorithm combining spectrum sensing and beam hopping was proposed. First, the signaltonoise ratio (SNR) of LEO satellite communication was estimated. Then the optimal threshold was selected according to the estimated SNR. An energy detection algorithm based on dynamic threshold was used to discriminate between the GEO satellite signals, and the beam adjustment was carried out according to the judgment results. Simulation results show that the error of the energy detection algorithm based on the dynamic threshold proposed is significantly lower than that of the traditional energy detection algorithm based on fixed threshold and spectrum sensing method based on secondorder cyclic statistics. When the signal to noise ratio is lower than -10dB the detection error is lower than 0。2, and when the signaltonoise ratio is higher than -5dB the detection error approaches zero.

Key words: satellite communication； cognitive radio, energy detection, dynamic threshold, beam hopping

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