Robust Outage-Constrained Secrecy Rate of Hybrid Power Line and Wireless Communication with Artificial Noise-Aided Beamforming for Smart Grid

• Published in: IEEE transactions on communications 2024-11, p.1-1
• Main Authors: Kong, Zhengmin, Gan, Li, Song, Jing, Huang, Tao, Yin, Weijun, Yan, Shihao, Yuan, Jinhong
• Format: Article
• Language: English
• Subjects: Beamforming; Communication system security; Eavesdropping; hybrid communication; Hybrid power systems; multi-hop network; multi-party eavesdropper collusion; Optical wavelength conversion; physical layer security; Receivers; Relays; Security; smart grid; Smart grids; Surveillance; Wireless networks
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2024.3502678

Power line communication is a critical component of smart grids, which are vulnerable to eavesdropping. To address this challenge, we investigate a cooperative relay hybrid power line and wireless communication system where multiple eavesdroppers are considered. We propose an elaborate artificial noise (AN)-aided beamforming (BF) scheme to improve physical layer security. Our scheme maximizes the outage-constrained secrecy rate (OCSR) of the legitimate link while restricting the capacity of the eavesdroppers to a reasonable region. However, due to the imperfect channel state information of the wiretap channel and secrecy outage probability constraint, the robust OCSR problem becomes intractable because of the non-concave secrecy objective function and the non-convex constraints. To solve this issue, we utilize semidefinite programming and Bernstein-type inequality to transform the robust OCSR nonconvex problem into two convex sub-problems, which a block-coordinated descent algorithm can solve. Simulation results showcase the effectiveness of our robust AN-aided secure BF scheme and show that the proposed scheme outperforms the benchmark scheme in a security performance gain under various channel conditions, even in the worst case.