期刊
OPTIK
卷 259, 期 -, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2022.168986
关键词
Quadrature amplitude modulation (QAM); Digital signal processing (DSP); Multiple-input multiple-output (MIMO); Equal gain combining (EGC); Air bubbles; Underwater wireless optical communication (UWOC)
类别
资金
- Department of Electronics and Information Technology, Ministry of Electronics and Information Technology, Government of India [MEITY-PHD-2383]
This paper proposes a system for high-speed and reliable wireless optical communication underwater, achieving a data rate of 112 Gbps. The use of MIMO techniques improves the transmission range and power budget.
Underwater applications like real-time marine observations, video streaming, communication between underwater sensor nodes require spectrally efficient, high-speed (>100 Gbps) and reliable wireless links. In this paper, a coherently detected dual-polarization (DP)-16 quadrature amplitude modulation (QAM) based system is proposed for turbulent underwater wireless optical communication (UWOC) which can transmit a data rate of 112 Gbps. The integration of digital signal processing (DSP) with a coherent system enables error-free transmission at longer distances. The proposed single-input single-output (SISO) system achieves reliable link ranges of 150 m, 55 m, 24 m, 10 m, and 5.5 m under the pure sea, clear ocean, coastal ocean, harbor I, and harbor II water conditions. Furthermore, spatial diversity with multiple-input multiple-output (MIMO) techniques is utilized to mitigate turbulence-induced losses and path losses. At the receiver, the multiple received MIMO branches are combined with the equal gain combining (EGC) method. The transmission range improvements have been observed with 2 x 2 MIMO and 3 x 3 MIMO techniques over the SISO UWOC system. The power budget enhancement of 6 dBm is observed by utilizing a 3 x 3 MIMO configuration over 1 x 1 SISO configuration, and 3 dBm power budget enhancement has been observed in the case of a 2 x 2 MIMO configuration over 1 x 1 SISO configuration. The proposed system can further be utilized in real ocean scenarios to transmit time-sensitive information among diverse underwater sensor nodes.
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