Abstract-In order to enhance the secrecy performance of the Generalized Space Shift Keying (GSSK) visible light communication (VLC) system, in this paper, an optical jamming aided secrecy enhancement scheme is proposed, in which the source transmitter (S) simultaneously sends both the confidential desired signal and optical jamming signals under amplitude and power constraints. The optical jamming signals obey the truncated Gaussian distribution for satisfying the constraints. Given the discrete set of channel inputs, the optical jamming aided GSSK-VLC system's secrecy performance is analyzed. Explicitly, the average mutual information (AMI), the lower bound of AMI and its closed-form approximation as well as the achievable secrecy rate are formulated analytically. Furthermore, the optimal power sharing strategy of the proposed GSSK-VLC systems relying on optical jamming is derived. Closed-form expressions are provided for the optimal power sharing in both the low-and high-SNR regions. Finally, extensive simulation results are presented to validate our analytical results.Index Terms-Visible light communication (VLC), generalized space shift keying (GSSK), physical layer security (PLS), optical jamming, achievable secrecy rate, power sharing.

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Wireless communication is facing an ever-increasing thirst for high-quality data transmission. However, this imposes high demands on the radio access networks (RAN), where optical fiber has been widely used both for the backhaul and fronthaul. However, the explosive escalation of wireless teletraffic tests the limits of the RAN's revenue vs cost trade-off, which motivates low-cost designs. Hence, we present a costefficient yet high-performance radio over fiber (RoF) aided RAN concept. We commence by introducing this motivation, followed by a brief introduction to analogue RoF (A-RoF) and digitised RoF (D-RoF), as well as to wireless multiple-input-multiple-input (MIMO) techniques. Then, we present the centralised RAN (C-RAN) concept relying on A-RoF aided MIMO signal processing, where the MIMO signal is carried by fiber and it is processed optically in a central unit. Subsequently, we focus our attention on a C-RAN small-cell application followed by our performance vs cost analysis of the A-RoF system compared to that of its baseband counterparts, demonstrating that the A-RoF design is capable of reducing the RAN's total cost, whilst meeting the third generation partnership project's (3GPP) requirements.

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In order to enhance the secrecy performance of the spatial modulation (SM) aided visible light communication (VLC) system, an optical jamming aided secrecy enhancement scheme is proposed in this paper, in which transmitter (Alice) sends the optical jamming signals and the confidential signal simultaneously with amplitude and power constraints, wherein the truncated Gaussian distribution is adopted by the optical jamming signals for the considered constraints. Additionally, with finite discrete support set of the channel inputs' distribution, the corresponding secrecy performance is systematically analyzed for the optical jamming aided SM-VLC system, which includes the average mutual information (AMI), the lower bound on AMI and its closedform expression approximation and the achievable secrecy rate. Furthermore, the power allocation problem for the proposed SM-VLC systems with optical jamming is considered. Finally, extensive simulation results are presented to validate our analytical results and the secrecy versus bit error ratio (BER) trade-off is characterized.

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