Artificial Noise-Aided Secrecy Beamforming Optimization Method for MISO Wiretap Channels

DOI: https://doi.org/10.62517/jike.202604309

Author(s)

Ruixin Li

Affiliation(s)

School of Electronic Information, Zhengzhou University of Light Industry, Zhengzhou, Henan, China

Abstract

Physical layer security technologies, which do not rely on complex key management and utilize the inherent physical characteristics of wireless channels to achieve secure information transmission, are a critical means of ensuring the confidentiality of future wireless communications. Artificial noise-aided beamforming design in Multiple-Input Single-Output (MISO) wiretap channels offers significant advantages in combating passive eavesdropping; however, existing optimization methods still suffer from shortcomings in relaxation accuracy, convergence efficiency, and robustness. This paper addresses the secrecy rate maximization problem in artificial noise-aided MISO wiretap channels. It constructs a non-convex optimization model incorporating total power constraints, null-space orthogonality constraints, sparse directional constraints, and dual robustness constraints. Simulation results demonstrate that the proposed solution framework integrating alternating optimization and semidefinite relaxation can significantly improve the system's secrecy rate and achieve faster convergence. Even in scenarios with channel estimation errors and eavesdropper location uncertainty, the algorithm maintains stable secrecy performance, verifying its superior robustness.

Keywords

MISO Wiretap Channel; Artificial Noise; Alternating Optimization; Semidefinite Relaxation

References

[1] Chen, X., Feng, Y. (2017) Security performance analysis of MISOME systems under secure outage probability constraints. Computer Technology and Development, 27: 83–87+92. [2] Xu, J., Xu, S., Sun, L. (2017) Robust beamforming design assisted by artificial noise in multi-transmitter single-receiver wiretap channels. Journal of Xi'an Jiaotong University, 51: 124–130. [3] Deng, Z., Dai, C., Zhang, Z. (2024) Physical layer secure communication assisted by hybrid reconfigurable intelligent surfaces and artificial noise. Journal of Electronics & Information Technology, 46: 3155–3164. [4] Li, J., Lü, B. (2023) MISO wireless secure transmission based on active intelligent reflecting surfaces and artificial noise assistance. Journal of Nanjing University of Posts and Telecommunications (Natural Science Edition), 43: 61–71. [5] Wang, S., Da, X. (2017) Robust secure transmission design for multi-beam satellite communications under non-ideal channel conditions. Journal of Electronics & Information Technology, 39: 92–100. [6] Shi, Y., Wu, Y., Zhao, D. (2024) Secure transmission scheme based on cooperative interference, hybrid intelligent reflecting surfaces and relay assistance. Journal of Computer Applications, 44: 253–258.