New Hybrid PAPR Reduction Techniques for OFDM-Based Visible Light Communication Systems

Freag, Haitham; Hassan, Emad S.; El-Dolil, Sami A.; Dessouky, Moawad I.

doi:10.1515/joc-2017-0002

Cited by 15 publications

(20 citation statements)

References 14 publications

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“…The PAPR of the three-layer superimposed signals becomes [24]       It was found that oversampling=4 should be used as the best tradeoff between efficiency and computational complexity, correct with the theoretical analysis [9].…”

mentioning

confidence: 72%

“…In a traditional VLC scheme based on OFDM or FBMC, bias values equal to the absolute minimum value are applied. Several state-of-the-art methods are used for comparison: Hadamard transform with clipping ratio=1.8 [20], Discrete cosine transform, and clipping ratio=1.8 [24] in term of PAPR and BER performance.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, we can achieve a good tradeoff between PAPR reduction and BER performance when selecting a scaling factor of s = 0.3. Thus, the proposed PAPR reduction scheme outperforms some state-of-the-art methods [20] and [24], in terms of BER performance. With the FBMC based VLC system, the proposed non-redundant three-layer PAPR reduction technique gives good values for different values of s and 3 A is compared with the OFDM-based VLC system.…”

Section: Effect Of Limit Boundarymentioning

confidence: 88%

“…In the OFDM-based VLC system, an inverse fast Fourier Transform (IFFT) of length 128 was performed after the Quadrature amplitude modulation (QAM) block. Traditionally, the step after QAM modulation was to enforce Hermitian Symmetry (HS) on the IFFT input, which provides a real output result but requires twice the number of IFFT/FFT points in transmitter and receiver, so computational complexity of HS requires higher power consumption and requires higher chip dimensions, as shown in figure 1 [20], [24].…”

Section: A Ofdm Based Vlc System Modelmentioning

confidence: 99%

“…Furthermore, reduced PAPR will suppress back-off at the transmitter's power amplifier, allowing the Signal-to-Noise Power Ratio (SNR) of each subcarrier to be comparatively higher. As numerical examples, we evaluate the clipping threshold to minimize BER [23], [24]. In this paper, we used FBMC in VLC with an IM/DD channel more generally, complete with quantized performance analysis.…”

Section: Introductionmentioning

confidence: 99%

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Three-Layer PAPR Reduction Technique for FBMC Based VLC Systems

et al. 2021

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In this paper, a new non-redundant three-layer peak-to-average power ratio (PAPR) reduction technique is proposed for filter bank multicarrier communication based visible light communication (FBMC based VLC) systems. In the proposed technique, the FBMC based VLC data signal is overlapped with two new non-redundant signals. The initial-layer signals are the FBMC modulated signals. For PAPR reduction, the second-layer signals are constructed to decrease initial-layer large-amplitude signals, while the last-layer signals are used to improve the initial-layer small-amplitude signals. The two non-redundant signals do not overlap with the data signals in the frequency domain, because data signals are distributed on odd subcarriers, while even subcarriers are occupied by the constructed signals. To mitigate the effect of large-amplitude signal reduction in the proposed technique, the negative signals are converted into positive, rather than being clipped off as in conventional FBMC based VLC systems. In order to realize a trade-off between PAPR reduction and bit error rate (BER), we introduce a scaling factor in the converted signals. The performance of the proposed technique is calculated in terms of complementary cumulative distribution function (CCDF) and BER. The obtained results indicate that FBMC based VLC systems with the proposed technique can achieve a good trade-off between PAPR reduction and BER and outperforms the corresponding orthogonal frequency division multiplexing (OFDM) based VLC systems.

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confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Limit Boundarymentioning

confidence: 88%

Section: A Ofdm Based Vlc System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three-Layer PAPR Reduction Technique for FBMC Based VLC Systems

et al. 2021

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Enhanced bit error rate in visible light communication: a new LED hexagonal array distribution

et al. 2022

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Due to the exponential growth of mobile devices and wireless services, a huge demand for radio frequency has increased. The presence of several frequencies causes interference between cells, which must be minimized to get the lower bit error rate (BER). For this reason, it is of great interest to use visible light communication (VLC). This paper suggests a VLC system that decreases the BER with applying a new LED distribution with a hexagonal shape using different techniques: on–off keying (OOK), quadrature amplitude modulation, and frequency reuse concept to mitigate the interference between the reused frequencies inside the hexagonal shape. The BER is measured in two scenarios line of sight (LoS) and non-line of sight for each technique that we used. The recommended values of BER in the proposed model for soft frequency reuse in case of LoS at 4, 8, and 10 dB signal to noise ratio, are 3.6 × 10–6, 6.03 × 10–13, and 2.66 × 10–18, respectively.

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A reduced PAPR hybrid OFDM visible light communication system

et al. 2022

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Orthogonal frequency division multiplexing (OFDM) is used by visible light communication (VLC) systems. Its main goal is to lessen inter-symbol interference's negative impacts. As a result, a lot of bandwidth and a high data rate are transmitted. Using OFDM-based VLC systems, nonetheless, have a high peak-to-average power ratio (PAPR). This research presents a new VLC system for indoor applications that reduces the PAPR while maintaining an acceptable bit error rate (BER). To achieve this, a hybrid pre-coding technique-based PAPR reduction solution is proposed; Vander-monde like matrix (VLM) combined with Gaussian matrix (GM). This technique takes advantage of both VLM and GM as a two stages for the signal to simultaneously reduce the PAPR and save the BER from damage. According to the results, the proposed solution (VLM in conjunction with GM) lowers the PAPR to 9.5 dB. Our system performs better when compared to other systems like discrete cosine transform (DCT), GM, VLM, DCT&GM, and original OFDM by 27%, 25%, 11%, 20%, and 34%, respectively.

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New Hybrid PAPR Reduction Techniques for OFDM-Based Visible Light Communication Systems

Cited by 15 publications

References 14 publications

Three-Layer PAPR Reduction Technique for FBMC Based VLC Systems

Three-Layer PAPR Reduction Technique for FBMC Based VLC Systems

Enhanced bit error rate in visible light communication: a new LED hexagonal array distribution

A reduced PAPR hybrid OFDM visible light communication system

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