Secure beamforming schemes in artificial noise-based MISO visible light communications
WANG Jinyuan, YU Yinchang, LIN Shenghong +5 more
To improve the performance of physical-layer security, secure beamforming schemes were designed for artificial noise (AN)-aided multiple-input single-output visible light communication (VLC) systems. To address the issue that non-line-of-sight (NLoS) channel gains were easily overlooked, a system model that simultaneously considers line-of-sight and NLoS channel gains was established. Under perfect and imperfect channel state information conditions, optimal and robust secure beamforming problems were formulated, respectively. Considering the limitations of semidefinite relaxation (SDR) and Gaussian randomization methods, secure beamforming schemes combining semidefinite programming and penalty function were proposed. Numerical results show that, compared with SDR and Gaussian randomization methods, the proposed schemes can provide at least 3 dB of power gain. Moreover, both the adoption of AN technology and the consideration of NLoS channel gain can effectively reduce the system’s transmission power.
•Dec 1, 2025•0 citations