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Assistant Professor, Imam Hossein (AS) University, Tehran, Iran
Abstract
With the expansion of 5G wireless networks and the need for sensitive information exchange, security has become a fundamental challenge. Traditional cryptographic methods, despite their algorithmic complexity, are vulnerable to technological advancements and require secure communication channels for cryptographic key exchange. This paper examines Physical Layer Security (PLS) solutions that enable secure data exchange by utilizing the inherent characteristics of wireless communication channels. The proposed system in this paper is a multi-antenna wireless communication system where users exchange secure information through a relay node in the presence of an eavesdropping node. To counter eavesdropping, a cooperative interference strategy is presented in two distinct phases, which, through artificial interference beamforming and information reception beamforming, reduces the Signal-to-Interference-and-Noise Ratio (SINR) at the eavesdropping node while increasing it at authorized nodes. The optimal system design is solved using Semi-Definite Relaxation (SDR), and the Transmit Zero-Forcing (TZF) beamforming scheme is also introduced for comparison with optimal performance. Simulation results show that the optimal scheme improves the average secrecy rate by 11.98 bps/Hz and 16.33 bps/Hz compared to the TZF scheme and reference system, respectively, and achieves an eavesdropping link outage probability of 81%. Meanwhile, the TZF scheme, with acceptable performance compared to the reference system, improves the secrecy rate by 4.35 bps/Hz and increases the eavesdropping link outage probability to 0.9%.
Roostaei, A., & Esfahani, .. (2025). Improving Physical Layer Security in 5G Networks Based on Cooperative Node Performance. Electronic and Cyber Defense, 13(3), -.
MLA
Amir Roostaei; .R Esfahani. "Improving Physical Layer Security in 5G Networks Based on Cooperative Node Performance", Electronic and Cyber Defense, 13, 3, 2025, -.
HARVARD
Roostaei, A., Esfahani, .. (2025). 'Improving Physical Layer Security in 5G Networks Based on Cooperative Node Performance', Electronic and Cyber Defense, 13(3), pp. -.
VANCOUVER
Roostaei, A., Esfahani, .. Improving Physical Layer Security in 5G Networks Based on Cooperative Node Performance. Electronic and Cyber Defense, 2025; 13(3): -.
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