Demonstration of a 2 × 2 MIMO-UWOC system with large spot against air bubbles

Chen, Xiao; Dai, Yizhan; Tong, Zhijian; Yang, Xuchao; Li, Xin; Song, Guangbin; Zou, Haiwu; Jia, Bowen; Qin, Sitong; Zhang, Zejun; Zhao, Jian; Xu, Jing

doi:10.1364/ao.443498

Cited by 14 publications

(2 citation statements)

References 21 publications

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“…In addition, problems such as turbulenceinduced flicker and difficulties in aligning the communication link can be reduced. In 2022 [62] , Zhejiang University demonstrated that the 2×2MIMO-UWOC system can mitigate the impact of underwater bubbles and link misalignment on communications.…”

Section: The Uwoc System Technical Problems and Solution Pathsmentioning

confidence: 99%

The research progress in underwater wireless optical communication technology

Han¹,

Nie²,

Chang³

et al. 2023

First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023)

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Underwater wireless optical communication, which is an effective technical way to build a high-speed and flexible underwater wireless communication network due to its large bandwidth, good confidentiality and low time delay, is widely regarded as a complementary communication way to hydroacoustic communication. The newest research progress and main technical specification in the current technology of underwater wireless optical communication are introduced, the characteristics of the current underwater wireless optical communication technology are summarized in this paper. A series of improvement measures are proposed for the problems of short communication distance and low robustness in underwater wireless optical communication system, which can provide references for underwater wireless optical communication technology research and engineering project development.

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Section: The Uwoc System Technical Problems and Solution Pathsmentioning

confidence: 99%

The research progress in underwater wireless optical communication technology

Han¹,

Nie²,

Chang³

et al. 2023

First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023)

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“…These implementations are actually semiphysical simulations with idealized processing of receiving signals rather than real-time and deployable MIMO-UWOC systems. Additionally, these systems are bulky, heavy, and expensive [18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Real-time UWOC miniaturized system based on FPGA and LED arrays and its application in MIMO

Huang,

Yin,

Liang

et al. 2024

中国光学快报

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In order to alleviate the impact of turbulence on the performance of underwater wireless optical communication (UWOC) in real time, and achieve high-speed real-time transmission and low cost and miniaturization of equipment, a 2 × 2 real-time multiple-input and multiple-output (MIMO) high-speed miniaturized UWOC system based on a field-programmable gate array (FPGA) and a high-power light-emitting diode (LED) array is designed in this Letter. In terms of multiplexing gain, the imaging MIMO spatial multiplexing and high-order modulation for the first time are combined and the real-time high-speed transmission of PAM-4 signal based on the LED array light source in 12 m underwater channel at 100 Mbps rate is implemented, which effectively improves the throughput of the UWOC system with a high-power commercial LED light source. In light of diversity gain, the system employs the diversity of repeated coding scheme to receive two identical non-return-to-zero on-off keying (NRZ-OOK) signals, which can compensate the fading or flickering sublinks in real time under the bubble-like simulated turbulence condition, and has high robustness. To our knowledge, this is the first instance of a high rate and long-distance implementation of a turbulence-resistant real-time MIMO miniaturized UWOC system based on FPGA and high-power LED arrays. With spatial diversity or spatial multiplexing capabilities, its low cost, integrity, and high robustness provide the system with important practical prospects.

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