Low-Complexity Hybrid Optical OFDM with High Spectrum Efficiency for Dimming Compatible VLC System

Feng, Simeng; Feng, Hongyinping; Zhou, Ying; Li, Baolong

doi:10.3390/app9183666

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…At the transmission side, the precoding block is performed after mapping the input data sequence in complex format and serial-to-parallel converter [26,27]. The output of the precoding block can follow different paths for DCO-OFDM, ACO-OFDM, and Flip-OFDM systems.…”

Section: Precoding Techniquesmentioning

confidence: 99%

Hybrid PAPR reduction schemes for different OFDM-based VLC systems

2024

Opto-Electronics Review

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Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peakto-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLAB TM software has been successfully used to show the validity of the proposed schemes.

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Section: Precoding Techniquesmentioning

confidence: 99%

Hybrid PAPR reduction schemes for different OFDM-based VLC systems

2024

Opto-Electronics Review

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“…Improved OFDM-schemes exist [298], [299]. The demand for both explicit compatibility with illumination and dimming functions and for enhanced modulation performance [300]- [302], necessitates the introduction of superposition or hybrid OFDM schemes [303], [304]. The goal is to (i) enlarge the power and spectral efficiency, (ii) reduce the peak-to-average power ratio and/or (iii) minimise the induced nonlinearity or distortion.…”

Section: H Physical and (Data) Link Layer Of The Osi Modelmentioning

confidence: 99%

Visible Light Positioning as a Next-Generation Indoor Positioning Technology: A Tutorial

Bastiaens,

Alijani,

Joseph

et al. 2024

IEEE Commun. Surv. Tutorials

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Indoor positioning technology has become undisputedly pervasive in modern society. It can be used for numerous applications in various environments, ranging from agriculture to smart industry. Among the different indoor positioning technologies, the development of the indoor visible light positioning (VLP) system has gained momentum recently thanks to its low cost and centimetre-order accuracy. Moreover, VLP is a promising candidate technology for integration with Light Fidelity (Li-Fi), which relies on the optical spectrum to build future wireless networks and plays a significant role in sixth-generation (6G) wireless networks. This tutorial investigates VLP as a novel positioning technology in depth. The inherent characteristics and fundamentals of this technology are extensively described with the components of a VLP system and possible localization approaches being discussed. Furthermore, a mathematical and technical discussion of a simple minimum retrofit of the single photodiode (PD) received signal strength (RSS) VLP systems is provided. Finally, the paper concludes with open challenges and a future roadmap for VLP.

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“…Low-Complexity Hybrid Optical OFDM with High Spectrum Efficiency for Dimming Compatible VLC System [10] In this paper, the authors proposed a novel dimming compatible hybrid optical orthogonal frequency division multiplexing (DCHO-OFDM) method to fulfil the requirements for both communications and illuminations. Explicitly, the signal branch of the unclipped asymmetrically clipped O-OFDM (ACO-OFDM) and the down/upper-clipped pulse-amplitude-modulated discrete multitone (PAM-DMT) are adaptively combined to increase the spectrum efficiency.…”

mentioning

confidence: 99%