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    Home > Publications > International Journal
    • 22-04-26 11:51
    논문 제목 Predistortion Approaches Using Coefficient Approximation and Bidirectional LSTM for Nonlinearity Compensation in Visible Light Communication
    게재 학회 Photonics
    게재 년월 2022.03
    참여 연구원 Yun-Joong Park , Joon-Young Kim and Jae-Il Jung
    A Light-Emitting Diode (LED) has a nonlinear characteristic, and it contains fundamental
    limitations for the performance of Visible Light Communication (VLC) systems in indoor environments
    when using intensity modulation with Orthogonal Frequency Division Multiplexing (OFDM).
    In this paper, we investigate this nonlinear characteristic with analysis and proposal. At first, we
    identified the LED nonlinear characteristics in terms of bit-error performances. After analysis, we
    propose initial predistortion schemes to mitigate the nonlinearity matters. In the predistortion
    schemes, the nonlinear distortion compensation model contains predistortion features with the LED
    inverse characteristics. Considering a Direct-Current-biased Optical OFDM (DCO-OFDM) system,
    we compared the Bit-Error Rate (BER) performances with and without compensation via simulations.
    The performance on the LED with the compensation showed LED nonlinearity could significantly
    improve the bit-error performance. In addition, with consideration that the predistortion model is insufficient
    to represent LED distortion, we investigated possible opportunities of distortion correction
    using Bidirectional Long Short-Term Memory (BLSTM), one of the leading deep learning approaches.
    Its result showed promising improvement of the distortion compensation as well.