低軌道衛星地面整合網路之安全非正交多重存取傳輸

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簡健軒(Jian-Xuan Jian) 查詢紙本館藏

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資訊工程學系

論文名稱

低軌道衛星地面整合網路之安全非正交多重存取傳輸
(Secure NOMA transmission in LEO Satellite Terrestrial Network)

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摘要(中)

衛星廣泛的廣播覆蓋特性使其容易受到竊聽攻擊。在5G的不同潛在多址接入候選者中，非正交多址(Non-orthogonal multiple access (NOMA))是主要競爭者之一。在非正交多址，來自不同終端用戶(User Terminal (UT))的訊號被獨立編碼和調變，然後在傳輸前進行訊號疊加，接收端利用連續干擾消除(Successive Interference Cancellation (SIC))的方法來獲取用戶終端的訊息，但是，SIC的進行會帶來額外的安全威脅。本文討論了傳統SIC所面臨的威脅，並提出了一種能夠容忍衛星地面網絡中通道狀態資訊(Channel State Information (CSI))快速變化和無法獲得瞬時通道狀態資訊的安全方法，並且可以與其他物理層安全方法互相結合。

摘要(英)

Satellite′s wide broadcasting coverage property make it is vulnerable to eavesdropping attacks. Among the different potential multiple access candidates for 5G, Non-Orthogonal Multiple Access (NOMA) is one of the main contenders. In Non-Orthogonal Multiple Access, signals from different user termianls (UTs) are independently coded and modulated, and then superposition before transmission, and the receiver uses the principle of Successive Interference Cancellation (SIC) to obtain UT information. However, the implementation of SIC leads to additional threats. This paper discusses the threat of conventional SIC and proposes an security method that can tolerate the rapid changes of channel state information (CSI) and the inability to obtain instantaneous CSI in satellite terrestrial networks, and can be combined with other physical layer security methods.

關鍵字(中)

★ 衛星地面網路
★ 非正交多重存取
★ 竊聽攻擊

關鍵字(英)

★ Satellite-terrestrial Networks
★ NOMA
★ Eavesdropping Attack

論文目次

中文摘要 i
Abstract ii
致謝 iii
Contents iv
List of Figures vi
List of Tables viii
1 Introduction 1
2 Related Work 3
2.1 Satellite communication security research . . . . . . . . . . . . . . . . . 3
2.2 Enhance NOMA security by CSI . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Enhance NOMA security by pre-shared message . . . . . . . . . . . . . 4
3 System Model 6
3.1 Channel Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1 Free Space Path Loss . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.2 Beam Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.3 Channel Fading Coefficient . . . . . . . . . . . . . . . . . . . . 8
3.2 Signal Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 NOMA SIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Threat Model 12
5 Countermeasure 14
5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Pseudo Random Constellation Rotation . . . . . . . . . . . . . . . . . . 15
5.3 Generate rotation angle . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.4 Reference Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.5 Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.6 Implementation of NOMA-OFDM Physical Layer Security . . . . . . . . 21
5.7 Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.7.1 Find optimal power allocation factor . . . . . . . . . . . . . . . . 23
5.7.2 Impact on SINR and Secrecy Metrics . . . . . . . . . . . . . . . 26
5.7.3 BER analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6 Conclusion 32
Bibliography 33

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指導教授

張貴雲(Guey-Yun Chang)

審核日期

2022-8-31

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