Enhancing the Secrecy Performance of Gaussian MISO VLC Wiretap Channels with Randomly Located Eavesdroppers

• Published in: 2018 IEEE International Conference on Communications (ICC) pp. 1 - 6
• Main Authors: Arfaoui, Mohamed Amine, Ghrayeb, Ali, Assi, Chadi
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.05.2018
• Subjects: Array signal processing; Closed-form solutions; Ear; Light emitting diodes; MISO communication; Radio frequency; Receivers
• ISSN: 1938-1883
• DOI: 10.1109/ICC.2018.8422651

We study in this paper the achievable secrecy rate of the Gaussian multiple-input single-output (MISO) visible light communication (VLC) in the presence of randomly located eavesdroppers. We consider a system model comprising a transmitter (Alice) equipped with multiple fixtures of LEDs, one legitimate receiver (Bob) equipped with a single photo-diode (PD) and a group of randomly located eavesdroppers, each equipped with a single PD. The channel is modeled as deterministic, real- valued and subject to an amplitude constraint, through which Alice wants to communicate privately with Bob. We consider the case where the eavesdroppers are colluding together, i.e., they act jointly in eavesdropping on the communication between Alice and Bob. We adopt the truncated generalized normal (TGN) as input signaling and beamforming as transmission strategy. At first, we derive a closed-form expression of the average achievable secrecy rate as a function of the density of eavesdroppers using stochastic geometry. Then, we investigate the optimal beamformer that maximizes the average achievable secrecy rate of the system. Finally, the analysis is verified by Monte Carlo simulations.