研究目的
Investigating the physical layer security of a mixed visible light communication (VLC)/radio frequency (RF) system with energy harvesting in the presence of an eavesdropper.
研究成果
The study derives exact and asymptotic closed-form expressions for SOP and ASC in a mixed VLC/RF system with energy harvesting. Numerical results validate the analytical findings, showing that increasing the DC offset and reducing the distance between the source and relay improve system performance. The asymptotic analysis reveals that the secrecy performance is primarily influenced by the VLC link's parameters and the eavesdropper's channel quality.
研究不足
The study assumes Rayleigh fading for the main and wiretap channels and does not consider other fading models. The energy used by the relay to process data is assumed negligible, which may not hold in all practical scenarios. The analysis is limited to a single eavesdropper scenario.
1：Experimental Design and Method Selection:
The study analyzes the secrecy performance in terms of secure outage probability (SOP) and average secrecy capacity (ASC) for a mixed VLC/RF system with energy harvesting. Theoretical models for the VLC and RF links are employed, including the derivation of exact and asymptotic closed-form expressions for SOP and ASC.
2：Sample Selection and Data Sources:
The system includes one LED source (S), one relay (R), and one legitimate receiver (D) in the presence of an eavesdropper (E). The relay collects energy from the DC component of the optical signal in the VLC link and uses it to retransmit data through the RF link.
3：List of Experimental Equipment and Materials:
The setup involves LEDs for VLC transmission, a photo-detector at the relay for energy harvesting, and RF transmission equipment for data retransmission. Parameters such as LED power, photo-detector responsivity, and channel gains are specified.
4：Experimental Procedures and Operational Workflow:
The process involves two time slots: in the first, the LED source sends an optical signal to the relay; in the second, the relay uses harvested energy to retransmit data to the receiver via RF. The eavesdropper attempts to interpret the signal during the RF transmission.
5：Data Analysis Methods:
The analysis includes deriving exact and asymptotic expressions for SOP and ASC, considering Rayleigh fading for the RF links. Numerical results are presented to validate the analytical findings.
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