Novel Dimmable Visible Light Communication Approach Based on Hybrid LACO-OFDM

Sun, Yuhao; Yang, Fang; Gao, Junnan

doi:10.1109/jlt.2018.2866825

Cited by 20 publications

(16 citation statements)

References 25 publications

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“…In this work, for achieving the highest spectral efficiency of system, the coefficients, M ( ) , ρ ( ) and DC are searched by the traversal method where the parameters are listed in the Table 1 for explicit description. In some previous works, the suboptimal solutions to these parameters can be obtained by setting the same layer amplitude factors or the fixed DC voltage for simplifying the search process [22], [28]. In this work, the optimal solutions for the system performance are considered, and the suboptimal ones will be our future work.…”

Section: Principle Of L/e-aco-scfdm Based Dimming Scheme For Vlcmentioning

confidence: 99%

“…Besides, hybrid L-ACO-OFDM (HLACO-OFDM) combining L-ACO-OFDM and negative L-ACO-OFDM is proposed. In [22], the dimming adjustment is achieved by changing the proportion of positive and negative signals where the optimal signal amplitudes are fixed for avoiding the excess clipping noise and reducing the complexity. In the OFDM-based dimmable VLC schemes mentioned above [15]- [22], the specific signal structures are designed to alleviate the clipping distortion to some extent.…”

Section: Introductionmentioning

confidence: 99%

“…In [22], the dimming adjustment is achieved by changing the proportion of positive and negative signals where the optimal signal amplitudes are fixed for avoiding the excess clipping noise and reducing the complexity. In the OFDM-based dimmable VLC schemes mentioned above [15]- [22], the specific signal structures are designed to alleviate the clipping distortion to some extent. However, the essential problem that the OFDM signal is susceptible to the clipping distortion thanks to its high peak-to-average power ratio (PAPR) property, has not been solved.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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In this paper, we propose a dimmable visible light communication (VLC) system based on spectral-efficient layered/enhanced asymmetrically clipped optical single-carrier frequency-division multiplexing (L/E-ACO-SCFDM). L/E-ACO-SCFDM superimposes multi-layer ACO-SCFDMs occupying different subcarriers for enhancing the spectral efficiency of the system. Both the adjustable layer polarities and the low peak-to-average-power ratio property of ACO-SCFDM make it better suited to the linearity-limited VLC system. Meanwhile, L/E-ACO-SCFDM has the signal-to-noise ratio averaging advantage, which can effectively resist the high-frequency distortion caused by the bandwidth limitation of the VLC system. Based on the maximization of spectral efficiency of the system, the layer amplitudes, layer spectral efficiencies, and bias voltage are jointly optimized for providing the efficient communication under different illumination requirements. Benefiting from the numerous strengths, the proposed L/E-ACO-SCFDM-based dimming scheme can achieve at least 22.0% average spectral efficiency gain compared with several state-of-the-art OFDM-based dimming schemes within the same dimming range, which shows the great superiority for future practical applications of VLC.

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Section: Principle Of L/e-aco-scfdm Based Dimming Scheme For Vlcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…While Sun et al and Wang et al 12,13 proposed LACO-OFDM scheme that combines different layers of ACO-OFDM, in each layer, different subcarriers are modulated. The results suggest that DHT-based OFDM has doubled the spectral efficiency of the classical ACO-OFDM and DCO-OFDM for real constellation with the same bit error rate (BER), as Hermitian symmetry is not required for the input signal.…”

mentioning

confidence: 99%

“…In the presented work, Chen et al 11 proposed a non-Hermitian symmetry OFDM scheme that replaces the Hermitian symmetry by space diversity, as it transmits the real and imaginary parts of the OFDM symbol using pair of white LEDs. While Sun et al and Wang et al 12,13 proposed LACO-OFDM scheme that combines different layers of ACO-OFDM, in each layer, different subcarriers are modulated. In the first layer only, odd subcarriers are modulated as in traditional ACO-OFDM, while the even subcarriers are modulated in the higher layers.…”

mentioning

confidence: 99%

Odd clipping optical orthogonal frequency division multiplexing for VLC system

Ibrahim

Ismail

Elsayed

et al. 2019

Int J Communication

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The Orthogonal Frequency Division Multiplexing (OFDM) has emerged as one of the promising techniques because of its robustness to multipath fading with high-speed data transmission. Classical bipolar OFDM cannot be used in intensity modulated with direct detection (IM/DD) optical communication systems, as visible light communication (VLC), so many optical modulation techniques as asymmetrical clipped optical OFDM (ACO-OFDM) and DC-Clipped OFDM (DCO-OFDM) have been investigated. In this paper, we introduce a novel optical modulation scheme that meets the optical communications requirements. The proposed odd clipping optical OFDM technique (OCO-OFDM) is based on the Fourier transform symmetry properties in which the imaginary and odd signal is converted to odd and real valued signal. As a result of this work, the proposed OCO-OFDM and its modified version have several benefits over ACO-OFDM and DCO-OFDM. By introducing a better bit error rate, with the same spectral efficiency as DCO-OFDM and the same power efficiency as ACO-OFDM for real valued modulation technique as Binary Phase-Shift Keying (BPSK), and with the same spectral efficiency and power efficiency as ACO-OFDM for complex valued modulation technique as Quadrature Phase-Shift Keying (QPSK) and Eight Phase-Shift Keying (8PSK).

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Dimmable Hybrid Modulation Based on VOOK/VPPM and Optical OFDM for Visible Light Communications

Qian

Xue

2023

Lecture Notes in Electrical Engineering

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Novel Dimmable Visible Light Communication Approach Based on Hybrid LACO-OFDM

Cited by 20 publications

References 25 publications

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

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

Odd clipping optical orthogonal frequency division multiplexing for VLC system

Dimmable Hybrid Modulation Based on VOOK/VPPM and Optical OFDM for Visible Light Communications

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