Enhancing the performance of optical VLC system based on asymmetric symmetric subcarriers OFDM

Sobhy, Androw; ElSayed, Shaimaa; Zekry, Abdelhalim

doi:10.1002/dac.4226

Cited by 11 publications

(20 citation statements)

References 26 publications

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“…Substituting ( 11) in (8), and let ( ) the transmission filter gain is unity, the power at the detector is written as :…”

Section: Vlc Modelmentioning

confidence: 99%

“…The added DC bias is responsible for shifting the OFDM symbols before clipping. The output DCO-OFDM is written by change (3), and it becomes [8]:…”

Section: Dco-ofdmmentioning

confidence: 99%

“…Where βdc is DC bias could be added and selected concerning the standard deviation of the DCO-OFDM signal [6]. The performance of DCO-OFDM is strongly affected by the DC bias, as the optical power efficiency of the system decreases [8], [12], [14].…”

Section: Dco-ofdmmentioning

confidence: 99%

“…Many others suggested several techniques to enhance the spectral efficiency based on optical OFDM [8], [15], [23], [24]. This section describes the proposed model of ADO-OFDM features and the details for the system design.…”

Section: Proposed Enhancement Modelmentioning

confidence: 99%

“…The VLC uses the Light Emitting Diode (LED) as a light source, satisfying both communication and illuminations simultaneously [5]. Orthogonal Frequency Division Multiplexing (OFDM) has been commonly used in VLC systems in recent years [8]- [10], due to its high spectral efficiency and the Intersymbol Interference (ISI) resistance. The OFDM symbols can be represented as intensity for optical wireless communication, which means the modulated signals are both real and positive; however, the baseband OFDM signals usually are complex and bipolar [11].…”

Section: -Introductionmentioning

confidence: 99%

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Performance enhancement for visible light communication based ADO-OFDM

2021

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“…Substituting ( 11) in (8), and let ( ) the transmission filter gain is unity, the power at the detector is written as :…”

Section: Vlc Modelmentioning

confidence: 99%

“…The added DC bias is responsible for shifting the OFDM symbols before clipping. The output DCO-OFDM is written by change (3), and it becomes [8]:…”

Section: Dco-ofdmmentioning

confidence: 99%

Section: Dco-ofdmmentioning

confidence: 99%

Section: Proposed Enhancement Modelmentioning

confidence: 99%

Section: -Introductionmentioning

confidence: 99%

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Performance enhancement for visible light communication based ADO-OFDM

2021

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An ADO‐OFDM with integrated precoding, companding and optimized power allocation methods for high‐speed data transmission in visible light communication

S.,

N. R.

2024

Trans Emerging Tel Tech

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Visible light communications (VLC) has received a lot of attention in recent studies because of its benefits over radio‐frequency (RF) communications. It is a short‐range optical wireless communication system that uses light‐emitting diodes (LEDs) as transmitters. Optical orthogonal frequency division multiplexing (OFDM) is an auspicious technology for VLC high‐speed data transfer. The use of OFDM in a VLC system raises the system's peak‐to‐average power ratio (PAPR). The intrinsic non‐linearity of LED is a key concern in an asymmetrically clipped DC‐biased optical OFDM (ADO‐OFDM) system due to its high PAPR. Also, conventional ADO‐OFDM modulation scheme cannot be used for accommodating different demands of services in downlink multiple access due to the restriction of direct current biased optical OFDM (DCO‐OFDM) and asymmetrically clipped optical (ACO‐OFDM) transmission on odd and even subcarriers. To tackle this issue, a modified ADO‐OFDM (MADO‐OFDM) is proposed that adjusts the numbers of subcarriers required for the transmission of ACO‐OFDM and DCO‐OFDM adaptively based on the requests of services in downlink multiple access. Also, the proposed MADO‐OFDM is integrated with a discrete Hartley Matrix transform (DisHMT) precoder and Generalized Piecewise Linear Compander (GPLD) to provide high‐speed data transmission with less PAPR. In addition, the power is allocated to the proposed MADO‐OFDM system optimally by maximizing the channel capacity based on the Aquila optimizer algorithm. The simulation results reveal that the suggested system's PAPR is reduced by 2.4 dB and 0.8 dB, respectively, compared to conventional ADO and hybrid ADO‐OFDM. It also confirms that the suggested generalized PLC can greatly increase BER without affecting the PAPR performance.

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Throughput improvement in ACO-OFDM-based VLC systems using noise cancellation and precoding techniques

Zenhom,

Hamad,

Elnabawy

2024

Opt Quant Electron

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One of the primary challenges faced by visible light communication (VLC) systems employing optical orthogonal frequency division multiplexing is the peak-to-average power ratio (PAPR). This study is dedicated to designing, simulating, and evaluating bit error rate (BER) and PAPR reduction methods tailored for the VLC broadcasting system. The asymmetric clipped optical orthogonal frequency division multiplexing (ACO-OFDM) scheme is highlighted in this work for its impressive performance. Therefore, the proposed PAPR mitigation methodologies applied to ACO-OFDM. The proposed PAPR reduction strategy involves 5 distinct precoding methodologies. The PAPR was mitigated by 3.485 dB after applying the DST precoding methodology. Still, the WHT precoding methodology can achieve PAPR reduction by 1.131 dB, without BER performance degradation, with respect to the conventional ACO-OFDM system. Furthermore, the work addresses another challenge in VLC systems: the bit error rate (BER). This is accomplished by introducing approaches to Time Domain Noise Cancelation and Frequency Domain Noise Cancelation (FDNC). The BER performance of these 2 receiver models is nearly the same. The simulation results indicate the system performance enhancement after applying noise cancellation approaches by 1.65 dB at the 4-QAM modulation scheme and 2.97 dB at the 1024-QAM modulation scheme. The 16-QAM modulation scheme, after applying DST and WHT methodologies alongside noise cancellation approaches, can enhance both PAPR by 20.83% and 6.76%, but the Eb/N0 performance enhancement by 10.10% and 14.64%, respectively. Additionally, the effectiveness and validity of the proposed schemes are verified by comparing them with relevant literature reviews on PAPR reduction techniques and selecting an optimal choice among them.

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Enhancing the performance of optical VLC system based on asymmetric symmetric subcarriers OFDM

Cited by 11 publications

References 26 publications

Performance enhancement for visible light communication based ADO-OFDM

Performance enhancement for visible light communication based ADO-OFDM

An ADO‐OFDM with integrated precoding, companding and optimized power allocation methods for high‐speed data transmission in visible light communication

Throughput improvement in ACO-OFDM-based VLC systems using noise cancellation and precoding techniques

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