Adaptive Pre-Distortion Compensation for LED Nonlinear Distortion in VLC-OFDM Systems Using Frequency Symbol Spreading

This paper proposes an adaptive pre-distortion method for mitigating LED nonlinear distortion in Visible Light Communication (VLC)-OFDM systems. The inherent nonlinear characteristics of LEDs disrupt the orthogonality among OFDM subcarriers, causing signal distortion and performance degradation. To...

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Main Authors: Koichi Seimiya, Ren Oshima, Geonuk Kang, Chang-Jun Ahn
Format: Article
Language:English
Published: MDPI AG 2025-04-01
Series:Applied Sciences
Subjects:
Online Access:https://www.mdpi.com/2076-3417/15/8/4221
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author Koichi Seimiya
Ren Oshima
Geonuk Kang
Chang-Jun Ahn
author_facet Koichi Seimiya
Ren Oshima
Geonuk Kang
Chang-Jun Ahn
author_sort Koichi Seimiya
collection DOAJ
description This paper proposes an adaptive pre-distortion method for mitigating LED nonlinear distortion in Visible Light Communication (VLC)-OFDM systems. The inherent nonlinear characteristics of LEDs disrupt the orthogonality among OFDM subcarriers, causing signal distortion and performance degradation. To overcome this issue while minimizing computational complexity at the transmitter, we introduce a feedback-based nonlinear parameter estimation approach using the Least Squares Method (LSM) and Median Based Method (MBM). These estimated parameters are then fed back to the transmitter, enabling efficient adaptive pre-distortion based on the inverse function of the estimated nonlinear characteristics. This approach reduces computational costs at the transmitter compared to conventional methods requiring high-performance processing. Additionally, we incorporate Frequency Symbol Spreading (FSS) to further enhance robustness against channel impairments such as Rician fading by equalizing the Signal-to-Noise Ratio (SNR) across subcarriers. Simulation results under various channel conditions, including AWGN, Rician fading, and realistic multi-LED lighting scenarios, demonstrate a significant improvement in Bit Error Rate (BER) performance, validating both the effectiveness and practical advantages of the proposed approach.
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spelling doaj-art-654d841fab5c46bdb97e75de2989e8a52025-08-20T02:24:43ZengMDPI AGApplied Sciences2076-34172025-04-01158422110.3390/app15084221Adaptive Pre-Distortion Compensation for LED Nonlinear Distortion in VLC-OFDM Systems Using Frequency Symbol SpreadingKoichi Seimiya0Ren Oshima1Geonuk Kang2Chang-Jun Ahn3Graduate School of Engineering, Chiba University, Chiba 263-8522, JapanGraduate School of Engineering, Chiba University, Chiba 263-8522, JapanDepartment of Smart Factory Convergence, Sungkyunkwan University, Suwon 16419, Republic of KoreaGraduate School of Engineering, Chiba University, Chiba 263-8522, JapanThis paper proposes an adaptive pre-distortion method for mitigating LED nonlinear distortion in Visible Light Communication (VLC)-OFDM systems. The inherent nonlinear characteristics of LEDs disrupt the orthogonality among OFDM subcarriers, causing signal distortion and performance degradation. To overcome this issue while minimizing computational complexity at the transmitter, we introduce a feedback-based nonlinear parameter estimation approach using the Least Squares Method (LSM) and Median Based Method (MBM). These estimated parameters are then fed back to the transmitter, enabling efficient adaptive pre-distortion based on the inverse function of the estimated nonlinear characteristics. This approach reduces computational costs at the transmitter compared to conventional methods requiring high-performance processing. Additionally, we incorporate Frequency Symbol Spreading (FSS) to further enhance robustness against channel impairments such as Rician fading by equalizing the Signal-to-Noise Ratio (SNR) across subcarriers. Simulation results under various channel conditions, including AWGN, Rician fading, and realistic multi-LED lighting scenarios, demonstrate a significant improvement in Bit Error Rate (BER) performance, validating both the effectiveness and practical advantages of the proposed approach.https://www.mdpi.com/2076-3417/15/8/4221VLCOFDMLEDpre-distortionnonlinearity
spellingShingle Koichi Seimiya
Ren Oshima
Geonuk Kang
Chang-Jun Ahn
Adaptive Pre-Distortion Compensation for LED Nonlinear Distortion in VLC-OFDM Systems Using Frequency Symbol Spreading
Applied Sciences
VLC
OFDM
LED
pre-distortion
nonlinearity
title Adaptive Pre-Distortion Compensation for LED Nonlinear Distortion in VLC-OFDM Systems Using Frequency Symbol Spreading
title_full Adaptive Pre-Distortion Compensation for LED Nonlinear Distortion in VLC-OFDM Systems Using Frequency Symbol Spreading
title_fullStr Adaptive Pre-Distortion Compensation for LED Nonlinear Distortion in VLC-OFDM Systems Using Frequency Symbol Spreading
title_full_unstemmed Adaptive Pre-Distortion Compensation for LED Nonlinear Distortion in VLC-OFDM Systems Using Frequency Symbol Spreading
title_short Adaptive Pre-Distortion Compensation for LED Nonlinear Distortion in VLC-OFDM Systems Using Frequency Symbol Spreading
title_sort adaptive pre distortion compensation for led nonlinear distortion in vlc ofdm systems using frequency symbol spreading
topic VLC
OFDM
LED
pre-distortion
nonlinearity
url https://www.mdpi.com/2076-3417/15/8/4221
work_keys_str_mv AT koichiseimiya adaptivepredistortioncompensationforlednonlineardistortioninvlcofdmsystemsusingfrequencysymbolspreading
AT renoshima adaptivepredistortioncompensationforlednonlineardistortioninvlcofdmsystemsusingfrequencysymbolspreading
AT geonukkang adaptivepredistortioncompensationforlednonlineardistortioninvlcofdmsystemsusingfrequencysymbolspreading
AT changjunahn adaptivepredistortioncompensationforlednonlineardistortioninvlcofdmsystemsusingfrequencysymbolspreading