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

Zan LI; Junfan HU; Bing LI; Jia SHI; Jiangbo SI

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

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

Topics: Satellite Communications Technology | 更新时间：2024-06-05

- Secrecy analysis for orthogonal time frequency space technique based LEO satellite communication
- Journal on Communications Vol. 42, Issue 8, Pages: 25-32(2021)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
  
  The National Science Foundation for Distinguished Young Scholar(61825104);The Key Project of National Natural Science Foundation of China(61631015);The National Natural Science Foundation of China(61901327);The Fundamental Research Funds for the Central Universities(JB210109)
- DOI：10.11959/j.issn.1000-436x.2021158
  CLC： TN918.9
- Online First：2021-08，
  
  Published：25 August 2021
- 稿件说明：
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Zan LI, Junfan HU, Bing LI, et al. Secrecy analysis for orthogonal time frequency space technique based LEO satellite communication[J]. Journal on Communications, 2021, 42(8): 25-32.
DOI：

Zan LI, Junfan HU, Bing LI, et al. Secrecy analysis for orthogonal time frequency space technique based LEO satellite communication[J]. Journal on Communications, 2021, 42(8): 25-32. DOI： 10.11959/j.issn.1000-436x.2021158.

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。

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.

关键词

Keywords

references

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