Modeling and outage analysis of multiple relayed hybrid VLC-RF system

In this research paper, we proposed a dual-hop multiple relayed hybrid visible light communication (VLC)-radio frequency (RF) system model which provide fast and secure communication link between hospital and distant laboratory for transmitting the patient's information. In this model information is transmitted from the smart monitoring devices in the form of optical signal via VLC channel towards the array of decode and forward (DF) relays placed on the ceiling of the room in a parallel fashion. A best relay is selected on the basis of the end-to-end signal to noise ratio (SNR) from source to destination. The selected relay then convert and decode the optical signal into its corresponding RF signal and further transmit it to the distant laboratory via RF channel. We first derive the statistical expressions of probability distribution functions (PDF) and cumulative distribution function (CDF) of the end to end signal to noise ratio (SNR) of the dual hop channel. Then, we use these statistical expressions to obtain closed form analytical expression of outage probability of the dual-hop parallel relayed hybrid VLC-RF system. Finally, we investigate the effect of various parameters on the system performance through numerical simulations in MatLab.