4.7 Article

Net 5.75 Gbps/2 m Single-Pixel Blue Min LED Based Underwater Wireless Communication System Enabled by Partial Pre-Emphasis and Nonlinear Pre-Distortion

Journal

JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 40, Issue 18, Pages 6116-6122

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2022.3188625

Keywords

Digital signal processing; LED; underwater optical wireless communication; visible light communications

Funding

  1. Shenzhen Municipal Science and Technology Innovation Council [JCYJ20190806142407195, JCYJ20210324131408023, JSGG20210818101404013]

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In this study, a combined digital signal processing scheme consisting of partial pre-emphasis and nonlinear pre-distortion is proposed to address the nonlinear and low-pass response issues in blue LED-based underwater optical wireless communication (UOWC) systems, improving the capacity and reach of the systems.
Blue LEDs are cost-effective optical sources suitable for underwater optical wireless communication (UOWC) systems. However, the nonlinearity and the low-pass response of LEDs alongside the limited sensitivity of photodetectors constrain the capacity and reach of UOWC systems. Here we address these issues by means of a combined DSP scheme consisting of partial pre-emphasis and nonlinear pre-distortion. Partial pre-emphasis pre-compensates for the low-pass response of the system while relaxing the power reduction induced by a high peak-to-average power ratio, whereas nonlinear pre-distortion can effectively alleviate the LED nonlinearity with only marginal impact on the signal power. Further, it is found that the signal power and the signal SNR at the receiver can be improved by setting a low current bias for the mini-LED because of less saturated radiative recombination. The effectiveness of this combined DSP scheme and device conditioning approach is experimentally validated and enables the transmission of a net 5.75 Gb/s PAM-S signal over 2 m of distance underwater, which, to our knowledge, is the highest net data rate achieved for single-pixel LED-based UOWC systems.

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