Cooperative Beamforming and Jamming for Secure VLC System in the Presence of Active and Passive Eavesdroppers

This paper proposes a novel cooperative beamforming and jamming scheme to deal with passive active eavesdroppers (EDs) in indoor visible light communication (VLC) networks. An ED VLC systems can augment its front-end receiver by implementing possible device modifications; thus, is very useful for curbing such an enhanced since it would be impossible distinguish between the information signals. In contrast traditional artificial noise strategies that only either or EDs, we propose combined of significantly improves secrecy performance when both types EDs exist. The proposed designed maximize signal-to-interference-plus-noise ratio (SINR) legitimate receiver, entirely suppress SINRs restrict average SINR EDs. We apply inverse free preconditioned Krylov subspace projection method convex-concave procedure obtain suboptimal weight intensity vectors. Also, optimal power splitter coefficient found through golden section search method. numerical results verify shows superior compared three benchmarks: 1) zero-forcing beamforming; 2) scheme; 3) beamforming.