Abstract
The most significant challenge of underwater optical wireless communication (UOWC) system is to overcome its limited coverage. To expand the achievable communication range, we investigate the performance of the dual-hop UOWC system with simultaneous lightwave information and power transfer (SLIPT). The time splitting (TS) method is adopted for wireless power transfer in the proposed system, where the information and energy are transmitted in different phases. A suitable transmission strategy is designed for the model without additional power supply, which contains three phases, i.e. information transmission, energy transmission, and forwarding process. The expressions of the average bit error rate (BER) at the target node and the energy harvested by the relay node are derived over underwater attenuation channel. Then, the effects of the TS factor and the distances on the system performance are investigated in two sub-problems, which minimize the average BER while satisfying the energy harvesting and transmitting rate constraints. Numerical results indicate the performance improvement by adopting the relay node with SLIPT.
Highlights
I N THE last few years, optical wireless communication (OWC) is considered as a promising complementary technology for radio frequency (RF) communication due to its capability of providing high data rate with low power and greater available bandwidth
A dual-hop structure with simultaneous lightwave information and power transfer (SLIPT) has been proposed for the Underwater optical wireless communication (UOWC) system based on time splitting (TS) transmission strategy
Our simulation results confirmed that the employment of the relay node is important for UOWC system to expand the communication distance
Summary
I N THE last few years, optical wireless communication (OWC) is considered as a promising complementary technology for radio frequency (RF) communication due to its capability of providing high data rate with low power and greater available bandwidth. As the signal is attenuated greatly underwater with the increase of distance, the communication range of UOWC is limited. To overcome this challenge, some works focus on how to alleviate the turbulence-induced fading through spatial diversity. In [13], the channel characteristics and the BER performance of UOWC systems are studied comprehensively. In [15], the BER performance of multi-hop UOWC systems under turbulence-induced fading is evaluated. The performance of relay-assisted underwater wireless optical code division multiple access networks has been investigated over turbulent channels in [16]. A major challenge for UOWC systems with SLIPT is overcoming the limited coverage For this issue, a double-hop UOWC system with SLIPT is investigated in this paper.
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