基于正交时频空技术的低轨卫星通信的安全分析

doi:10.11959/j.issn.1000-436x.2021158

通信学报 ›› 2021, Vol. 42 ›› Issue (8): 25-32.doi: 10.11959/j.issn.1000-436x.2021158

基于正交时频空技术的低轨卫星通信的安全分析

李赞¹, 胡俊凡¹, 李兵², 石嘉¹, 司江勃¹

¹ 西安电子科技大学综合业务网理论及关键技术国家重点实验室，陕西西安 710071
² 陕西省电子技术研究所，陕西西安 710032

修回日期:2021-06-02 出版日期:2021-08-25 发布日期:2021-08-01
作者简介:李赞（1975- ），女，陕西西安人，博士，西安电子科技大学教授、博士生导师，主要研究方向为隐蔽通信、频谱管控
胡俊凡（1997- ），女，山东济南人，西安电子科技大学博士生，主要研究方向为卫星通信、物理层安全、正交时频空技术等
李兵（1982- ），男，陕西西安人，博士，陕西省电子技术研究所高级工程师，主要研究方向为卫星有效载荷、系统设计等
石嘉（1987- ），男，陕西西安人，博士，西安电子科技大学副教授、博士生导师，主要研究方向为无线系统资源分配、毫米波通信、隐蔽通信等
司江勃（1980- ），男，陕西西安人，博士，西安电子科技大学教授、博士生导师，主要研究方向为无线通信网、协作传输、自适应传输技术等
基金资助:
国家杰出青年科学基金资助项目(61825104);国家自然科学基金资助项目(61631015);国家自然科学基金资助项目(61901327);中央高校基本科研业务费专项资金资助项目(JB210109)

Secrecy analysis for orthogonal time frequency space technique based LEO satellite communication

Zan LI¹, Junfan HU¹, Bing LI², Jia SHI¹, Jiangbo SI¹

¹ State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China
² Shaanxi Institute of Electronic Technology, Xi’an 710032, China

Revised:2021-06-02 Online:2021-08-25 Published:2021-08-01
Supported by:
The National Science Foundation for Distinguished Young Scholar(61825104);The National Natural Science Foundation of China(61631015);The National Natural Science Foundation of China(61901327);The Fundamental Research Funds for the Central Universities(JB210109)

摘要/Abstract

摘要：

为了提高低轨卫星下行通信系统的安全性能，引入协作无人机干扰机向窃听者发送干扰信号。为了弥补现有频偏补偿方法的不足，下行传输基于正交时频空技术，将时变频选信道转换为时延多普勒域中近似非衰落的信道，以应对低轨卫星高移动性带来的严重多普勒效应。采用阶矩匹配的方法，求得阴影莱斯分布星地信道叠加和的概率分布函数，进而推导出合法接收端安全中断概率的闭式解。仿真结果验证了相对于正交频分复用方案，采用无人机干扰机可以有效增强保密传输能力，以及应用正交时频空方案对提高下行低轨卫星通信的安全性能的优势。

关键词: 正交时频空技术, 低轨卫星通信, 物理层安全, 无人机协作

Abstract:

In order to improve the security performance of low earth orbit (LEO) satellite downlink communication system, a cooperative UAV was employed to send jamming signals against the eavesdroppers.In particular, the downlink transmission was based on the orthogonal time frequency space (OTFS) technique to combat the severe Doppler effect caused by the high mobility of the LEO satellite.The closed form expression for the security outage probability (SOP) was derived at the legitimate receiver, where a novel moment matching approach was used for finding a summed probability distribution function (PDF) of the shadowed-Rician (SR) distributed terms.Simulation results prove that the SOP performance advantage of the downlink LEO satellite communication achieved by OTFS over OFDM scheme, and show the effectiveness of employing unmanned aerial vehicle (UAV) jammer in terms of enhancing secrecy transmission.

Key words: OTFS, LEO satellite communication, physical layer security, UAV cooperation

中图分类号:

TN918.9

李赞, 胡俊凡, 李兵, 石嘉, 司江勃. 基于正交时频空技术的低轨卫星通信的安全分析[J]. 通信学报, 2021, 42(8): 25-32.

Zan LI, Junfan HU, Bing LI, Jia SHI, Jiangbo SI. Secrecy analysis for orthogonal time frequency space technique based LEO satellite communication[J]. Journal on Communications, 2021, 42(8): 25-32.

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衰落	m_j	b_j	Ω_j
重度衰落	1	0.063	0.000 7
平均衰落	5	0.251	0.279
轻度衰落	10	0.158	1.29

参数	数值
轨道高度/km	1 414
轨道倾角	52°
N_A	5
N_J	5
载波频率 f_c/GHz	2.4
子载波数目M	64
OTFS符号数目N	16
子载波间隔Δf /kHz	15
信道估计	理想
最大多普勒频移/kHz	37

基于正交时频空技术的低轨卫星通信的安全分析

Secrecy analysis for orthogonal time frequency space technique based LEO satellite communication

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