Novel Unipolar Optical Modulation Techniques for Enhancing Visible Light Communication Systems Performance

Farid, Sara M.; Saleh, Mona Z.; El-Badawy, Hesham M.; Elramly, Salwa

doi:10.1109/access.2022.3186007

Cited by 9 publications

(6 citation statements)

References 29 publications

(58 reference statements)

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“…In this depicted framework, located in Figure 1, the initial step at the transmitter involves the mapping of input serial data bits into complex modulated symbols utilizing either M-PSK or M-QAM mapper formats, denoted as S(W), where W ranges from 1 to N 2 − 1. They subsequently convert from a serial to a parallel configuration of length (N/2-1) before being applied to the data organization block [22]. The organization block aims to arrange the input complex symbols into the Hermitian symmetry (H.S) format known as X(k), as detailed in (1).…”

Section: Multicarrier Modulation Schemes Based On the Vlc System 21 D...mentioning

confidence: 99%

“…X ACO,I (K), X ACO,J (K) and X E (K) are as designated in Equations ( 17)- (19), respectively. They undergo processing using an IFFT process to generate real bipolar x ACO,I (n), x ACO,j (n), and x E (n) signals, respectively [22]: X ACO,I (K) = 0, S 1 , 0, S 2 , . .…”

Section: Asco-ofdmmentioning

confidence: 99%

“…The concept of computational complexity relates to the number of operations needed for both the IFFT/FTT at the transmitter and receiver [45,46]. Table 3 presents the computational complexity of the previously mentioned approaches [9,22]. The ACO, Flip, and DCO-OFDM computational complexity is O(Nlog 2 N) for both the transmitter and receiver.…”

Section: Computational Complexitymentioning

confidence: 99%

“…The FFT operation typically exhibits a complexity of O(Nlog 2 N) when using a standard Cooley-Tukey radix-2 FFT algorithm [22]. The IFFT operation is quite similar to the FFT, differing mainly in scaling factors, and it also has a complexity of O(Nlog 2 N).…”

Section: Techniquementioning

confidence: 99%

“…Here, y p (n) represents the samples of the first received segment, and y n (n) represents the samples of the second segment [22].…”

mentioning

confidence: 99%

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Optical-OFDM VLC System: Peak-to-Average Power Ratio Enhancement and Performance Evaluation

A. Zenhom,

Hamad,

Alghassab

et al. 2024

Sensors

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Visible Light Communication (VLC) systems are favoured for numerous applications due to their extensive bandwidth and resilience to electromagnetic interference. This study delineates various constructions of Optical Orthogonal Frequency Division Multiplexing (O-OFDM) approaches employed in VLC systems. Various factors are elaborated within this context to ascertain a more effective O-OFDM approach, including constellation size, data arrangement and spectral efficiency, power efficiency, computational complexity, bit error rate (BER), and peak-to-average power ratio (PAPR). This paper seeks to assess these approaches’ BER and PAPR performance across varying modulation orders. Regrettably, in VLC systems based on OFDM methodology, the superposition of multiple subcarriers results in a high PAPR. Therefore, this study aims to diminish the PAPR in VLC systems, enhancing system performance. We propose a non-distorting PAPR reduction technique, namely the Vandermonde-Like Matrix (VLM) precoding technique. The suggested technique is implemented across various O-OFDM approaches, including DCO-OFDM, ADO-OFDM, ACO-OFDM, FLIP-OFDM, ASCO-OFDM, and LACO-OFDM. Notably, this method does not affect the system’s data rate because it does not require the mandatory transmission of side information. Furthermore, this technique can decrease the PAPR without impacting the system’s BER performance. This study compares the proposed PAPR reduction technique against established methods documented in the literature to evaluate their efficacy and validity rigorously.

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Section: Multicarrier Modulation Schemes Based On the Vlc System 21 D...mentioning

confidence: 99%

Section: Asco-ofdmmentioning

confidence: 99%

Section: Computational Complexitymentioning

confidence: 99%

Section: Techniquementioning

confidence: 99%

“…Here, y p (n) represents the samples of the first received segment, and y n (n) represents the samples of the second segment [22].…”

mentioning

confidence: 99%

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Optical-OFDM VLC System: Peak-to-Average Power Ratio Enhancement and Performance Evaluation

A. Zenhom,

Hamad,

Alghassab

et al. 2024

Sensors

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ASCO-OFDM based VLC system throughput improvement using PAPR precoding reduction techniques

et al. 2023

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The huge bandwidth and immunity to electromagnetic interference make visible light communication (VLC) systems the preferred technique for many applications. Unfortunately, the superposition of multiple subcarriers in VLC orthogonal frequency division multiplexing systems leads to a high peak-to-average power ratio (PAPR). So, in this study, we aim to reduce PAPR in VLC systems and improve the system performance by proposing non-distorting PAPR reduction techniques like precoding techniques as it doesn’t affect the system data rate because they do not require any obligatory transmission of side information. Moreover, it has a very good ability to reduce the PAPR without affecting the system BER performance. So, different precoding reduction techniques are proposed like discrete cosine transform (DCT), discrete sine transform (DST), discrete Hatley transform (DHT), and Vandermonde like matrix (VLM), to address the high PAPR and light-emitting diode-restricted linear range problems in VLC systems. The proposed technique using DHT, DCT, DST, and VLM provided a significant advantage in reducing the PAPR by 1.35 dB, 1.46 dB, 2.12 dB, and 2.17 dB, respectively. So the proposed technique is based on using the VLM precoding technique to achieve maximum reachable PAPR reduction value. Also, a comparison of the presented work and related literature reviews for PAPR reduction techniques are held to ensure the validity and effectiveness of the proposed scheme.

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OFDM-Based VLC Systems: A Systematic Review

Ali,

Abdulkafi

2024

BIO Web Conf.

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Visible Light Communications (VLC) represents a new technology of wireless communications allowing high data rate, high-speed internet access, green and friendly communication system, especially for indoor users, where the use of Light Emitting Diodes (LEDs) is growing as a viable alternative to traditional illumination. Orthogonal frequency division multiplexing (OFDM) is a promising modulation format for optical wireless communication (OWC); however, precise channel estimation is required for synchronization and equalization. Moreover, one of the challenging issues for OFDM is its high Peak-to-Average Power Ratio (PAPR) due to the superposition of all subcarriers; therefore, the system requires a high linearity and dynamic range. This paper provides a systematic overview of OFDM-based VLC systems, highlighting the essential aspects of PAPR reduction and channel estimation techniques. Several technical challenges have been addressed to realize the full potential of OFDM-based VLC technology. Moreover, we provide new insights into the over-explored and under-explored areas, which lead us to identify open research problems of VLC based on OFDM. Concisely, this paper serves as a guide and a starting point for researchers willing to research VLC using OFDM.

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Novel Unipolar Optical Modulation Techniques for Enhancing Visible Light Communication Systems Performance

Cited by 9 publications

References 29 publications

Optical-OFDM VLC System: Peak-to-Average Power Ratio Enhancement and Performance Evaluation

Optical-OFDM VLC System: Peak-to-Average Power Ratio Enhancement and Performance Evaluation

ASCO-OFDM based VLC system throughput improvement using PAPR precoding reduction techniques

OFDM-Based VLC Systems: A Systematic Review

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