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Patterned Photostimulation with Digital Micromirror Devices to Investigate Dendritic Integration Across Branch Points
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Adaptive-memory-length look-up table (LUT)-based digital pre-distortion for IM/DD underwater wireless optical

Yanting Zhou, Junwei Zhang, Chao Lu

    Optics Express
    |March 5, 2024
    PubMed
    Summary

    A new digital pre-distortion method using an adaptive-memory-length look-up table (AML-LUT) significantly reduces complexity in underwater optical wireless communication (UOWC) systems. This approach achieves high performance with reduced memory size for 4-level pulse amplitude modulation (4-PAM) signals.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Wireless Networks

    Background:

    • Underwater optical wireless communication (UOWC) systems face challenges with signal distortion.
    • Digital pre-distortion (DPD) is crucial for mitigating nonlinearities in intensity modulation and direct detection (IM/DD) systems.
    • Existing DPD methods, like full-size look-up tables (LUTs) and multi-symbol simplified look-up tables (MSS-LUTs), can be complex and memory-intensive.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel adaptive-memory-length look-up table (AML-LUT)-based DPD scheme.
    • To evaluate the performance and implementation complexity of the AML-LUT-based DPD in a 4-level pulse amplitude modulation (4-PAM) UOWC system.
    • To compare the proposed AML-LUT DPD with existing DPD techniques in terms of performance and resource utilization.

    Main Methods:

    • Development of a DPD scheme utilizing an AML-LUT, where memory length is adaptively adjusted per pattern.
    • Experimental setup for a 625 Mbit/s 4-PAM UOWC system over a 1-meter transmission.
    • Evaluation of the AML-LUT DPD against full-size LUT (LUT-7) and MSS-LUT based DPDs, assessing power penalty and LUT size reduction.

    Main Results:

    • The AML-LUT-based DPD achieved a marginal 0.5 dB power penalty at 7% hard-decision forward error correction (HD-FEC) and KP4-FEC thresholds.
    • Implementation complexity was reduced by 93% compared to LUT-7 DPD and 89% compared to MSS-LUT DPD.
    • Comparable transmission performance was achieved with significantly lower complexity and memory requirements.

    Conclusions:

    • The proposed AML-LUT-based DPD offers a highly efficient solution for 4-PAM UOWC systems.
    • This method significantly reduces implementation complexity and memory footprint without compromising system performance.
    • The AML-LUT DPD shows strong potential for future high-speed, low-complexity, and memory-efficient UOWC and short-reach optical interconnects.