Secrecy Analysis of Distributed Null-Steering-Based Physical Layer Security Algorithm under Imperfect Channel Estimation
Iqbal, Usman Jung, Haejoon Guizani, Mohsen
Iqbal, Usman
Jung, Haejoon
Guizani, Mohsen
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Department
Machine Learning
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Type
Conference proceeding
Date
2025
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Language
English
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Abstract
In this paper, we examine the effectiveness of distributed null-steering-based physical layer security (PLS) in over-the-air computation (AirComp), considering the impact of imperfect channel estimation. AirComp has been extensively studied for its ability to efficiently aggregate data in Internet of Things (IoT) networks, but dealing with imperfect channel estimation is a major pragmatic challenge in these networks. This work focuses on how phase errors in imperfect channel estimation affect AirComp’s distributed null-steering-based PLS by evaluating their impact on the mean square error (MSE) performance. A closed-form expression is derived to quantify the degradation in PLS performance of AirComp systems caused by channel estimation errors. The analysis shows that imperfect channel state information (CSI) causes a non-negligible degradation in the MSE performance and also reduces the effectiveness of the PLS technique employed. The degradation of up to 10 times in the average MSE received at the desired location is observed at the loop SNR value of 5 dB. Furthermore, the average MSE gap between the legitimate receiver and the eavesdropper is reduced by more than 0.1 with imperfect channel estimation. The results provide insights into the potential degradation due to imperfect CSI, which helps to quantify the relationship between the CSI estimation error and its impact on the PLS performance of AirComp networks.
Citation
U. Iqbal, H. Jung and M. Guizani, "Secrecy Analysis of Distributed Null-Steering-Based Physical Layer Security Algorithm under Imperfect Channel Estimation," 2025 International Wireless Communications and Mobile Computing (IWCMC), Abu Dhabi, United Arab Emirates, 2025, pp. 819-823, doi: 10.1109/IWCMC65282.2025.11059711.
Source
Proceedings of the International Wireless Communications and Mobile Computing
Conference
2025 International Wireless Communications and Mobile Computing (IWCMC), 2025
Keywords
Over-The-air computation, imperfect channel state information, physical layer security
Subjects
Source
2025 International Wireless Communications and Mobile Computing (IWCMC), 2025
Publisher
IEEE