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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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Bibliography

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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

A proposed preamble channel estimation scheme for flip FBMC-based indoor VLC systems

Mohamed Y. El-Ganiny Ashraf A. M. Khalaf Aziza I. Hussein Hesham F. A. Hamed
Opto-Electronics Review | 2022 | 30 | 1 | e140859 | DOI: 10.24425/opelre.2022.140859
Keywords channel estimation filter bank multicarrier IEEE 802.15.7 standard interference approximation method visible light communication
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Abstract

Filter bank multicarrier waveform is investigated as a potential waveform for visible light communication broadcasting systems. Imaginary inter-carrier and/or inter-symbol interference are causing substantial performance degradation in the filter bank multicarrier system. Direct current-biased optical filter bank multicarrier modulation overcomes all the problems of direct current-biased optical-orthogonal frequency division multiplexing modulation approaches in terms of speed and bandwidth. However, it also wastes a lot of energy while transforming a true bipolar signal into a positive unipolar signal by adding direct current-bias. In this paper, a flip-filter bank multicarrier-based visible light communication system was introduced to overcome this problem. In this system, a bipolar signal is converted to a unipolar signal by isolating the positive and negative parts, turning them to positive and then delivering the signal. Also, a new channel estimation scheme for a flip-filter bank multicarrier system is proposed which improves the channel estimation performance compared to that of each of the conventional schemes. The proposed system performance is measured in terms of bit error rate, normalized mean squared error, and constellation diagram. The superiority of the proposed scheme over other conventional structures has been successfully verified by MATLAB 2020b simulation experiments results. These results are evaluated under indoor visible light communication standard.
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Bibliography

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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, 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

Cancelable template generation based on quantization concepts

Rana M. Nassar Ashraf A. M. Khalaf Ghada M. El-Banby Fathi E. Abd El-Samie Aziza I. Hussein Walid El-Shafai
Opto-Electronics Review | 2023 | 31 | 3 | e145940 | DOI: 10.24425/opelre.2023.145940
Keywords cancelable biometrics quantization concepts DCT JPEG access control authentication
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Authors and Affiliations

Rana M. Nassar
1
Ashraf A. M. Khalaf
1
ORCID: ORCID
Ghada M. El-Banby
2
Fathi E. Abd El-Samie
3 4
Aziza I. Hussein
5
ORCID: ORCID
Walid El-Shafai
3 6
  1. Department of Electrical Engineering, Faculty of Engineering, Minia University, Minia 61111, Egypt
  2.   Department of Industrial Electronics and Control Engineering, Faculty of Electronic Engineering, Menoufia University, Menouf 32952, Egypt
  3. Department of Electronics and Electrical Communications Engineering, Faculty of Electronic Engineering, Menoufia University, Menouf 32952, Egypt
  4. Department of Information Technology, College of Computer and Information Sciences, Princess Nourah Bint Abdurrahman University, Riyadh 84428, Saudi Arabia
  5. Electrical and Computer Engineering Department, Effat University, Jeddah, Kingdom of Saudi Arabia
  6.  Security Engineering Laboratory, Department of Computer Science, Prince Sultan University, Riyadh 11586, Saudi Arabia

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