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Hybrid PAPR reduction schemes for different OFDM-based VLC systems

Mohamed Y. El-Ganiny Ashraf A. M. Khalaf Aziza I. Hussein Hesham F. A. Hamed
Opto-Electronics Review | 2022 | 30 | 3 | e141951 | DOI: 10.24425/opelre.2022.141951
Keywords visible light communication peak-to-average power ratio bit error rate
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Abstract

Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.
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Authors and Affiliations

Mohamed Y. El-Ganiny
1
Ashraf A. M. Khalaf
2
ORCID: ORCID
Aziza I. Hussein
3
ORCID: ORCID
Hesham F. A. Hamed
4
  1. Department of Electrical Engineering, Higher Technological Institute, 10th of Ramadan City, Sharqia, Egypt
  2. Department of Electrical Engineering, Faculty of Engineering, Minia University, Minia 61519, Egypt
  3. Electrical and Computer Engineering Department, Effat University, Jeddah, Kingdom of Saudi Arabia
  4. Department of Telecommunications Engineering, Egyptian Russian University, Badr City, Egypt

PAPR reduction using a combination between precoding and non-linear companding techniques for ACO-OFDM-based VLC systems

Nazmi A. Mohammed Mohamed M. Elnabawy Ashraf A. M. Khalaf
Opto-Electronics Review | 2021 | 29 | 2 | 59-70 | DOI: 10.24425/opelre.2021.135829
Keywords visible light communication light emitting diode peak-to-average power ratio bit error rate
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Abstract

Peak-to-average power ratio reduction techniques for visible light communication broadcasting systems are designed, simulated, and evaluated in this work. The proposed techniques are based on merging non-linear companding techniques with precoding techniques. This work aims to nominate an optimum novel scheme combining the low peak-to-average power ratio with the acceptable bit error rate performance. Asymmetrically clipped optical orthogonal frequency division multiplexing with the low peak-to-average power ratio performance becomes more attractive to real-life visible light communication applications due to non-linearity elimination. The proposed schemes are compared and an optimum choice is nominated. Comparing the presented work and related literature reviews for peak-to-average power ratio reduction techniques are held to ensure the proposed schemes validity and effectiveness.
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Authors and Affiliations

Nazmi A. Mohammed
1
Mohamed M. Elnabawy
2 3
Ashraf A. M. Khalaf
2
ORCID: ORCID
  1. Photonic Research Lab, Electrical Engineering Department, College of Engineering, Shaqra University, Dawadmi 11961, Kingdom of Saudi Arabia
  2. Electrical Engineering Department, Faculty of Engineering, Minia University, Minia, Egypt, P.O. Box 61111, Minia, Egypt
  3. Electronics and Communication Department, Modern Academy for Engineering and Technology, Maadi 11585, Cairo, Egypt

A complexity efficient PAPR reduction scheme for FBMC-based VLC systems

Radwa A. Roshdy Aziza I. Hussein Mohamed M. Mabrook Mohammed A. Salem
Opto-Electronics Review | 2023 | 31 | 1 | e144919 | DOI: 10.24425/opelre.2023.144919
Keywords visible light communication filter bank multicarrier peak-to-average power ratio reduction computational complexity cube satellite communication link inter-satellite communications
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Abstract

Visible light communication based on a filter bank multicarrier holds enormous promise for optical wireless communication systems, due to its high-speed and unlicensed spectrum. Moreover, visible light communication techniques greatly impact communication links for small satellites like cube satellites, and pico/nano satellites, in addition to inter-satellite communications between different satellite types in different orbits. However, the transmitted visible signal via the filter bank multicarrier has a high amount of peak-to-average power ratio, which results in severe distortion for a light emitting diode output. In this work, a scheme for enhancing the peak-to-average power ratio reduction amount is proposed. First, an algorithm based on generating two candidates signals with different peak-to-average power ratio is suggested. The signal with the lowest ratio is selected and transmitted. Second, an alternate direct current-biased approach, which is referred to as the addition reversed method, is put forth to transform transmitted signal bipolar values into actual unipolar ones. The performance is assessed through a cumulative distribution function of peak-to-average power ratio, bit error rate, power spectral density, and computational complexity. The simulation results show that, compared to other schemes in literature, the proposed scheme attains a great peak-to-average power ratio reduction and improves the bit the error rate performance with minimum complexity overhead. The proposed approach achieved about 5 dB reduction amount compared to companding technique, 5.5 dB compared to discrete cosine transform precoding, and 8 dB compared to conventional direct current bias of an optical filter bank multicarrier. Thus, the proposed scheme reduces the complexity overhead by 15.7% and 55.55% over discrete cosine transform and companding techniques, respectively.
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Authors and Affiliations

Radwa A. Roshdy
1
ORCID: ORCID
Aziza I. Hussein
2
ORCID: ORCID
Mohamed M. Mabrook
3 4
ORCID: ORCID
Mohammed A. Salem
ORCID: ORCID
  1. Department of Electrical Engineering, Higher Technological Institute, 10th of Ramadan City, Egypt
  2. Electrical & Computer Eng. Dept., Effat University, Jeddah, Saudi Arabia
  3. Space Communication Dept., Faculty of Navigation Science & Space Technology, Beni-Suef University, Beni-Suef, Egypt
  4. Department of Communication and Computer Engineering, Faculty of Engineering, Nahda University in Beni-Suef, Egypt

Performance analysis of DFT-S-OFDM waveform for Li-Fi systems

Saleh Hussin Eslam M. Shalaby
Opto-Electronics Review | 2021 | 29 | 4 | 167-174 | DOI: 10.24425/opelre.2021.139753
Keywords light-fidelity visible light communications orthogonal frequency division multiplexing discrete Fourier transform spread peak-to-average power ratio
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Abstract

In this paper, the effect of an indoor visible light communication channel is studied. Moreover, the analysis of the received power distribution of the photodiode in the line of sight and the first reflection of the channel without line of sight with several parameters is simulated. Two different waveforms are explained in detail. Orthogonal frequency division multiplexing has been widely adopted in radio frequency and optical communication systems. One of the most important disadvantages of the orthogonal frequency division multiplexing signal is the high peak-to-average power ratio. Therefore, it is important to minimize the peak-to-average power ratio in the visible light communication systems more than in radio-frequency wireless applications. In the visible light communication systems, the high peak-to-average power ratio produces a high DC bias which reduces power efficiency of the system. A discrete Fourier transform spread orthogonal frequency division multiplexing is proposed to be used in wireless communication systems; its ability to minimize peak-to-average power ratio has been tested. The analysis of two different subcarrier allocation methods for the discrete Fourier transform-spread subcarriers, as well as the examination of two distinct subcarrier allocation strategies, distributed and localized mapping, are investigated and studied. The effects of an accurate new sub-band mapping for the localized discrete Fourier transform spread orthogonal frequency division multiplexing scheme are presented in this paper. The light-fidelity system performance of the orthogonal frequency division multiplexing and discrete Fourier transform spread orthogonal frequency division multiplexing with different sub-mapping techniques are simulated with Matlab™. A system performance size of bit error rate and peak-to-average power ratio are obtained, as well.
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Authors and Affiliations

Saleh Hussin
1
Eslam M. Shalaby
2
  1. Electronics and Communication Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, 44519 Egypt
  2. Electronics and Communication Engineering Department, Higher Technological institute, 10th of Ramadan City, Megawra 1, 44629 Egyp

Performance evaluation of UFMC-based VLC systems using a modified SLM technique

Eslam M. Shalaby E. Dessouky Saleh Hussin
Opto-Electronics Review | 2021 | 29 | 3 | 85-90 | DOI: 10.24425/opelre.2021.135832
Keywords universal filtered multi-carrier orthogonal frequency division multiplexing (OFDM) signal peak-to-average power ratio selected-mapping discrete Hartley transform precoding
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Abstract

Universal filtered multi-carrier (UFMC) is being studied as the favourable waveforms supporting the visible light communication broadcasting systems. However, the UFMC system faces a serious performance degradation on the transmitter side due to its high peak-to-average power ratio (PAPR). High PAPR of the signal is an analytical intention parameter for mobile networks, and it is necessary to minimize it as much as possible. This paper focuses on the PAPR reduction of the UFMC scheme. An efficient hybrid method of the PAPR reduction has been proposed and analysed through the Matlab™ simulation. The proposed hybrid scheme consists of a mixture of the selected-mapping method and the discrete Hartley transform precoding for a UFMC system (SLM-DHT-P-UFMC). The simulation results show that the proposed hybrid system has a better PAPR reduction performance compared to traditional SLM-UFMC and DHT-P-UFMC systems. Hence, SLM-DHT-P-UFMC is considered to be the suggested scheme in visible light communication broadcasting systems.
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Authors and Affiliations

Eslam M. Shalaby
1
E. Dessouky
2
Saleh Hussin
2
  1. Electronics and Communication Engineering Department, Higher Technological Institute, 10th of Ramadan City, Sharqia, 44629 Egypt
  2. Electronics and Communication Engineering Department, Faculty of Engineering Menoufia University, Menoufia, 32511 Egypt

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