Physical layer security in the presence of a mode-changing eavesdropper: Imperfect CSI

Articles in Press

Document Type : Research Paper

Authors

1 دانشگاه تخصصی فناوری نوین آمل

2 Electrical and Computer Engineering Department, Qom University of Technology, Qom

3 Department of electronic and computer engineering, Tarbiat Modares University, Tehran, Iran

4 Communication Technology Research Institute, Communication and Information Technology Research Institute, Tehran

Abstract

The broadcast nature of wireless communication poses a risk in terms of security. In this article, we use physical layer security as a security method in wireless networks. We consider the case where the adversary is able to eavesdrop on the secret message or send a jamming signal to the main receiver. To create a safe margin, we assume the best situation for the enemy, and we provide many facilities to him, and with such an assumption that creates a safe margin for us, we try to establish security in the system. Since the entire channel state information is available to the adversary, he will be able to intelligently choose between the two modes of eavesdropping and sending a jamming signal, which will result in a lower final secure rate. Obviously, in practice, the adversary hides his chosen state from the authorized sender and receiver, so detecting the state of the enemy, allocating resources and finally establishing security based on the diagnosis that may be wrong is a practical challenge in such systems. In this article, a probability-based solution to deal with this challenge is proposed and evaluated. In this solution, the probability of changing the enemy's state is taken into account, and power allocation is done by choosing the appropriate criteria for changing the enemy's state. We examine the probability-based solution in systems with channel uncertainty in the form of a pillar. Also, the dual method is used to solve the problem of power allocation.

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Main Subjects

Journal of Modeling in Engineering

Articles in Press, Accepted Manuscript
Available Online from 05 October 2025

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History

  • Receive Date: 04 January 2025
  • Revise Date: 21 August 2025
  • Accept Date: 25 August 2025

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