Spectral-Efficient L/E-ACO-SCFDM-Based Dimmable Visible Light Communication System

Zhang, Tiantian; Zhou, Ji; Zhang, Zhenshan; Lu, Yueming; Su, Fei

doi:10.1109/access.2019.2890881

Cited by 8 publications

(2 citation statements)

References 34 publications

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“…Below are concise descriptions of widely-used optimization algorithms. Compared to traditional gradientbased optimization algorithms, which suffer from both low efficiency and accuracy, Swarm Intelligence (SI) algorithms have proven effective and robust [20][21]. The Ant Colony Optimization (ACO) [22] algorithm draws inspiration from the foraging behavior of ants to find the optimal path.…”

Section: Introductionmentioning

confidence: 99%

A Novel Harmonic Detection Method for Microgrids Based on Variational Mode Decomposition and Improved Harris Hawks Optimization Algorithm

Wang,

Ren

et al. 2024

IEEE Access

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In the pursuit of enhancing harmonic detection precision within microgrids, this paper introduces a pioneering algorithm, VMD-DCHHO-HD, which amalgamates Variational Mode Decomposition (VMD) with an advanced Harris Hawk Optimization algorithm characterized by dynamic opposition-based learning and Cauchy mutation (DCHHO). This study establishes a fitness function based on Shannon entropy, thereby minimizing the Local Minimum Entropy (LME) as the optimization objective for DCHHO. Building upon this, the VMD crucial parameters are efficiently identified using the enhanced HHO algorithm (DCHHO), enabling precise decomposition of complex voltage signals. The proposed method effectively addresses issues commonly encountered in traditional Empirical Mode Decomposition (EMD) during harmonic analysis, such as mode mixing, endpoint effects, and significant errors. Notably, it adeptly captures harmonic components spanning diverse frequencies, offering a nuanced solution to common pitfalls in traditional methodologies. In simulation experiments, VMD-DCHHO-HD showcases remarkable proficiency in extracting microgrid voltage signals, excelling at discerning high-order, low-amplitude harmonic components amid noise. The algorithm's superior precision and heightened reliability, as affirmed by comparative analyses against existing methods, position it as an advanced tool for precise and robust harmonic analysis in microgrid systems.

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Section: Introductionmentioning

confidence: 99%

A Novel Harmonic Detection Method for Microgrids Based on Variational Mode Decomposition and Improved Harris Hawks Optimization Algorithm

Wang,

Ren

et al. 2024

IEEE Access

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“…The results of the Monte Carlo simulations show that the proposed HPD-LACO-OFDM scheme shows 0.86 dB PAPR gain over the LACO-OFDM scheme at average in 2 layers case, 1.28 dB PAPR gain in 3 layers case and 1.68 dB PAPR gain in 4 layers case. In addition, such hierarchical pre-distortion scheme could also be applied to layered/enhanced asymmetrically clipped optical single-carrier frequency-division multiplexing (L/E-ACO-SCFDM) for better PAPR performance [14], [15]. Furthermore, the BER performance of DCO-OFDM, 3-layers LACO-OFDM and HPD-LACO-OFDM based NOMA-VLC network with 2 users are experimentally compared.…”

Section: Introductionmentioning

confidence: 99%

A Power and Spectrum Efficient NOMA Scheme for VLC Network Based on Hierarchical Pre-Distorted LACO-OFDM

Huang

Xiao

et al. 2019

IEEE Access

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Recently, a hybrid multiple access (MA) scheme, non-orthogonal MA (NOMA) combined with orthogonal frequency-division MA (OFDMA), has attracted significant attention in the fifth-generation (5G) wireless communication due to its superior spectrum efficiency. However, the advantage of the hybrid MA scheme cannot be fully realized in visible light communication (VLC) networks, since current optical orthogonal frequency-division multiplexing (OFDM) technologies are unable to provide high spectrum efficiency and power efficiency at the same time. In this paper, a hierarchical pre-distorted layered asymmetrically clipped optical OFDM (HPD-LACO-OFDM) scheme is proposed for NOMA, which offers superior spectrum efficiency as well as high optical power efficiency. In HPD-LACO-OFDM, multiple layers of asymmetrically clipped optical OFDM (ACO-OFDM) signals are generated to fill the odd subcarriers successively, and the inter-layer interference is eliminated with successive signal pre-distortion. A comparison of the bit-error-rate (BER) performance between the traditional dc-biased optical OFDM (DCO-OFDM), the layered ACO-OFDM (LACO-OFDM), and the proposed HPD-LACO-OFDM scheme is experimentally performed. The results show that with the same signal power, the HPD-LACO-OFDM-based NOMA-VLC network shows the best BER performance, whereas the demand for direct current voltage is reduced by half of the signal voltage compared to the traditional DCO-OFDM-based NOMA-VLC network. INDEX TERMS Visible light communication (VLC), non-orthogonal multiple access (NOMA), orthogonal frequency division multiplexing (OFDM).

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The Evolution of Optical OFDM

Zhang

Babar

Petropoulos

et al. 2021

IEEE Commun. Surv. Tutorials

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Optical Orthogonal Frequency-Division Multiplexing (O-OFDM) is eminently suitable for mitigating the multi-path and chromatic dispersion in both Visible Light Communications (VLC) and Optical Fiber Communications. We commence our discourse by surveying the conception and historic evolution of O-OFDM designed for both VLC and optical fiber, culminating in the birth of its most flexible design alternative, namely Layered Asymmetrically Clipped Optical OFDM (LACO-OFDM). We demonstrate that it is eminently suitable for intensity-modulation and direct-detection aided optical communication systems and characterize its design flexibility. It is also shown that given its flexibility, it subsumes a wide range of optical OFDM schemes conceived over the past two decades or so. The LACO-OFDM transmitter and receiver designs strike a compelling compromise between the features of the popular Asymmetrically Clipped Optical OFDM (ACO-OFDM) and Direct Current Offset OFDM (DCO-OFDM). The pivotal role of forward error correction (FEC) designs is also surveyed with the objective of striking a coding gain versus complexity trade-off. We conclude by highlighting a suite of promising techniques capable of further improving the system performance, but require further research. The take-away message of the paper crystallized in the associated design guidelines.

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Spectral-Efficient L/E-ACO-SCFDM-Based Dimmable Visible Light Communication System

Cited by 8 publications

References 34 publications

A Novel Harmonic Detection Method for Microgrids Based on Variational Mode Decomposition and Improved Harris Hawks Optimization Algorithm

A Novel Harmonic Detection Method for Microgrids Based on Variational Mode Decomposition and Improved Harris Hawks Optimization Algorithm

A Power and Spectrum Efficient NOMA Scheme for VLC Network Based on Hierarchical Pre-Distorted LACO-OFDM

The Evolution of Optical OFDM

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