Abstract
In this paper, we analyze the performance of a dual-hop radio frequency-underwater wireless optical communication (RF-UWOC) transmission systems wherein the RF and UWOC links experience Nakagami- $m$ fading and the mixture Exponential-Generalized Gamma fading, respectively. The location of $S$ is uniformly distributed in the space of the hemisphere where the relay is located in the center of the hemisphere. The effect of bubbles level, temperature gradient, water types, and detection techniques are considered. We derive closed-form expressions for outage probability (OP) and average bit error rate (ABER) for both fixed and variable gain relaying schemes with different detection techniques. Furthermore, by utilizing the expansion of Meijer's $G$ -function and Fox's $H$ -function, the closed-form expressions for the asymptotic OP and ABER are derived when the average signal-to-noise ratio of both links tends to infinity. The analytical results are verified by Monte Carlo simulation results. Our results demonstrate that the diversity order of the dual-hop RF-UWOC systems depends on the RF fading parameter and detection technology of the UWOC link.
Highlights
In recent years, underwater wireless communication (UWC) systems have gained great interest recently as it realizes many potential applications for both civil and military purposes, such as, Vol 12, No 2, April 2020ecological monitoring, climate recording, and military surveillance
Remark 3: From (22), one can observe that the diversity order of the outage probability (OP) for the dual-hop system with variable gain relaying (VGR) depends on the detection techniques of underwater wireless optical communication (UWOC) link and the fading parameter of RF link
The OP of the considered dual-hop radio frequencyunderwater wireless optical communication (RF-UWOC) system with VGR or fixed-gain relaying (FGR) under the same turbulence conditions is presented in Figs. 2–4 as a function of the varying environmental conditions, fading parameters of RF link, and detection technique adopted over UWOC link
Summary
Underwater wireless communication (UWC) systems have gained great interest recently as it realizes many potential applications for both civil and military purposes, such as, Vol 12, No 2, April 2020. The secrecy performance of the dual-hop RF-UWOC systems was investigated in [7] and the closed-form expression for the intercept probability for the fixed-gain relaying (FGR) scheme was derived. The asymptotic results demonstrate that the diversity order of the dual-hop systems depends on the RF fading parameter and detection technology of the r. Relative to [8], wherein the secrecy performance was investigated and the expressions for average secrecy capacity and intercept probability were derived, respectively, we assume a different system model where S is uniformly distributed in the space of the hemisphere (V ), and R is located in the center of the hemisphere.
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