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Alleviating LED Nonlinearity in a HACO System Using a Blend of Precoder and a \(\upmu\)-Law Compander

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Abstract

Due to its many advantages, orthogonal frequency division multiplexing (OFDM) is frequently utilised in optical wireless systems to achieve rapid data transmission. Hybrid asymmetrically clipped optical OFDM (HACO-OFDM) is a widely utilised approach in OFDM-based visible light communication (VLC) systems because it allows for high-rate burst transmission while maintaining reliability in a multi-path fading environment. Meanwhile, the congenital nonlinear characteristic of LEDs is a critical hindrance in VLC OFDM systems due to the high peak-to-average power ratio (PAPR) of OFDM signals. The high PAPR necessitates a large input back-off power to operate LEDs in the linear zone, lowering the BER of OFDM-based optical devices. In order to reduce PAPR and ameliorate non-linearity in the HACO-OFDM system, this work offers a hybrid precoder with \(\upmu\)-law compander approach. The auto-correlation association of modulated data symbols is suppressed by pre-processing in the frequency domain using a preset precoder matrix (PM), resulting in a low PAPR score. PAPR is further reduced by compressing the precoded signal in the time domain with the \(\upmu\)-law compressor. The PAPR of the proposed design is just 5.1 dB. It also reduces the non-uniform SNR spread among data symbols and mandates a low SNR for a 10\(^{-5}\) reference bit error rate (BER). Furthermore, with a reference BER of 10\(^{-3}\), the hybrid approach reduces the optical bit energy required for high-speed data transmission. The metric used to calculate the system’s non-linearity is the percentage error vector magnitude (EVM %). For 0 dB input back-off (IBO), the hybrid technique has an EVM of 5.59%, compared to 30% for a traditional HACO system. The reduction in LED nonlinearity reduces in-band and out-of-band distortion, allowing high-data-rate services to be supported.

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Funding

The work was supported by Birla Institute of Technology (BIT), Mesra under the Institute Research Fellowship (IRF) scheme - GO/Estb/Extn-Institute-F/Ph.D/2020–21/4231.

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Authors and Affiliations

  1. Department of ECE, Madanapalle Institute of Technology & Science, Madanapalle, Chittoor, Andhra Pradesh, 517325, India

    Nishant Sharan

  2. Department of ECE, Birla Institute of Technology, Mesra, Ranchi, India

    S. K. Ghorai

  3. Department of ECE, School of Engineering, Presidency University, Bangalore, Karnataka, India

    Ajit Kumar

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  1. Nishant Sharan
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Sharan, N., Ghorai, S.K. & Kumar, A. Alleviating LED Nonlinearity in a HACO System Using a Blend of Precoder and a \(\upmu\)-Law Compander. Wireless Pers Commun 131, 1149–1165 (2023). https://doi.org/10.1007/s11277-023-10474-5

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