Performance analysis of physical layer security based on channel correlation

Xuanli WU; Zhicong XU; Yuchen WANG; Yong LI

doi:10.11959/j.issn.1000-436x.2021066

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Performance analysis of physical layer security based on channel correlation

Papers | 更新时间：2024-06-05

- Performance analysis of physical layer security based on channel correlation
- Journal on Communications Vol. 42, Issue 3, Pages: 65-74(2021)
- 作者机构：
  
  1. 哈尔滨工业大学电子与信息工程学院，黑龙江哈尔滨 150001
  2. 清华大学电子工程系，北京 100084
  3. 中国电子科技集团公司第五十四研究所，河北石家庄 050081
- 作者简介：
- 基金信息：
  
  Foundation of Science and Technology on Communication Networks Laboratory(6142104190410)
- DOI：10.11959/j.issn.1000-436x.2021066
  CLC： TN929.53
- Online First：2021-03，
  
  Published：25 March 2021
- 稿件说明：
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Xuanli WU, Zhicong XU, Yuchen WANG, et al. Performance analysis of physical layer security based on channel correlation[J]. Journal on Communications, 2021, 42(3): 65-74.
DOI：

Xuanli WU, Zhicong XU, Yuchen WANG, et al. Performance analysis of physical layer security based on channel correlation[J]. Journal on Communications, 2021, 42(3): 65-74. DOI： 10.11959/j.issn.1000-436x.2021066.

摘要

针对物理层安全研究中主窃信道具有相关性的场景，研究了主窃信道间的相关性对系统安全性能产生的影响，推导得到了遍历保密容量及中断概率的精确计算式，以及主窃信道的信道状态差异较大和较小这2种场景下的渐近计算式，并通过仿真验证了理论分析的正确性。研究结果表明，信道相关性会造成遍历保密容量的损失，但信道相关性强并不一定表明通信中断概率大。当目标速率设置合理时，信道相关性的影响与接收端平均信噪比有关，在高信噪比区域，强相关性会降低中断概率；在低信噪比区域，强相关性会增大中断概率；在中信噪比区域内，相关性几乎不影响系统的中断概率。基于上述结论，可以根据接收端信噪比、信道增益比、相关性等条件合理地设置系统参数，维护系统的安全性能。

Abstract

In view of the correlation of the main and eavesdropper’s channels in physical layer security

the impact of channel correlation on the secrecy performance was studied

the exact form ulations of ergodic secrecy capacity and secrecy outage probability were derived

and then the asymptotic formulations in the scenarios where the channel states were large and small were given.The theoretical analysis were verified by the numerical simulations.The simulation results show that channel correlation will cause the loss of ergodic secrecy capacity

however

it does not mean the outage probability of communication will increase with high channel correlation.Actually

when the outage rate is set reasonably

the impact of channel correlation is related to the average signal-to-noise ratio (SNR) at the receiver end.At high SNR range

high correlation will decrease the outage probability

at low SNR range

high correlation will increase the outage probability

and at medium SNR range

the correlation will not affect the outage probability significantly.Based on the above conclusion

the parameters can be set according to SNR and correlation

so that the secrecy performance can be maintained.

关键词

Keywords

references

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