PAPR Reduction for Hybrid ACO-OFDM Aided IM/DD Optical Wireless Vehicular Communications

Li, Baolong; Xu, Wei; Zhang, Hua; Zhao, Chunming; Hanzo, Lajos

doi:10.1109/tvt.2017.2698265

Cited by 26 publications

(16 citation statements)

References 25 publications

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“…To begin with, we investigate the PAPR performance of the proposed DCHO-OFDM scheme, compared to that of the HACO-OFDM, where the associated complimentary cumulative distribution function (CCDF) can be seen in Figure 4 [26]. It is observed that the proposed DCHO-OFDM achieves a much lower PAPR than that of the conventional HACO-OFDM.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…This observation is as expected for the reason that the unclipped ACO-OFDM is invoked in DCHO-OFDM, which is capable of avoiding relatively high amplitudes. Note that a lower PAPR results in a better ability to resist the non-linearity [26]. Therefore, unlike the HACO-OFDM, the proposed OFDM scheme is capable of alleviating the undesired non-linear distortion in the presence of the non-linear transfer characteristic of LED.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…For achieving dimming control, directly combining the HACO-OFDM signal with PWM is deemed to be inefficient. Due to the non-negativity of the clipped unipolar signal x ACO,n c and y PAM,n c , the hybrid signal may exceed the dynamic range of LEDs with a large probability [26]. To overcome, a negative-valued NHACO-OFDM signal is invoked to superpose to the high brightness level of PWM signal to avoid non-linear distortion, while the HACO-OFDM with positive-polarity is invoked for the low-brightness scenario [22].…”

Section: Brief Review Of Haco-ofdmmentioning

confidence: 99%

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

Feng

Zhou

et al. 2019

Applied Sciences

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In visible light communications (VLC), dimming control constitutes an indispensable technique to comply with various illumination necessities and with different energy consumption constraints. Therefore, a novel dimming compatible hybrid optical orthogonal frequency division multiplexing (DCHO-OFDM) is conceived in this paper to fulfil the requirements from 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 amalgamated in order to increase the spectrum efficiency. For the sake of precisely achieving dimming control, the chromaticity-shift-free and industry-preferred pulse width modulation (PWM) is further invoked to the hybrid signal, assisted by a time-varying biasing scheme to mitigate the non-linear distortion. As the different signal components in DCHO-OFDM are beneficially combined in an interference-orthogonal approach, the transmitted symbols are able to be readily detected upon relying on a standard OFDM receiver, as that of ACO-OFDM. Our simulations demonstrate that a high spectrum efficiency of the conceived DCHO-OFDM scheme can be achieved with less fluctuation in a wide dimming range.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

Section: Brief Review Of Haco-ofdmmentioning

confidence: 99%

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

Feng

Zhou

et al. 2019

Applied Sciences

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“…By incorporating the penalty terms corresponding to the equality constraints (3b) and (5) into the OF, we finally obtain the following penalized problem…”

Section: B Proposed Penalty-cccp Based Algorithmmentioning

confidence: 99%

“…Due to the multicarrier feature, FBMC has a similar high peak-to-average power ratio (PAPR) issue as the traditional orthogonal frequency division multiplexing (OFDM) [3], [4], which degrades the efficiency of the power amplifier (PA). However, the conventional PAPR reduction methods conceived for OFDM [5], [6] suffer from significant performance degradation in FBMC systems due to the overlap between adjacent symbols. Hence, specific PAPR reduction methods have been designed for FBMC systems to handle the overlapping structure [7]- [12].…”

Section: Introductionmentioning

confidence: 99%

Peak-to-Average Power Ratio Reduction Based on Penalty-CCCP for Filter Bank Multicarrier Systems

Cui

Zhao

Lei

et al. 2019

IEEE Trans. Veh. Technol.

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Filter bank multicarrier (FBMC) has received substantial research attention as benefit of its low out-of-band emission and high spectral efficiency. However, a main challenge of FBMC is its relatively high peak-to-average power ratio (PAPR). Hence we formulate an optimization problem for the PAPR reduction of FBMC signals, where the PAPR is minimized subject to the constraints of symbol distortion and dummy subcarrier power used for PAPR-reduction. In order to tackle the highly coupled nonconvex problem, we convert the original problem into a more tractable yet equivalent form and then propose a novel algorithm based on the penalty concave-convex procedure (penalty-CCCP). Our simulation results show that the proposed algorithm substantially reduces the PAPR compared to conventional techniques.

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Reduction of PAPR in Optical OFDM Signals Using PTS Schemes Without Side Information

Binita¹,

Hema²

2020

Lecture Notes in Electrical Engineering

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PAPR Reduction for Hybrid ACO-OFDM Aided IM/DD Optical Wireless Vehicular Communications

Cited by 26 publications

References 25 publications

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

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

Peak-to-Average Power Ratio Reduction Based on Penalty-CCCP for Filter Bank Multicarrier Systems

Reduction of PAPR in Optical OFDM Signals Using PTS Schemes Without Side Information

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