PAPR reduction using SLM-PTS-CT hybrid PAPR method for optical NOMA waveform

Arun Kumar; Karthikeyan Rajagopal; Nuha Alruwais; Haya Mesfer Alshahrani; Hany Mahgoub; Kamal M Othman

doi:10.1016/j.heliyon.2023.e20901

PAPR reduction using SLM-PTS-CT hybrid PAPR method for optical NOMA waveform

Heliyon. 2023 Oct 14;9(10):e20901. doi: 10.1016/j.heliyon.2023.e20901. eCollection 2023 Oct.

Authors

Arun Kumar¹, Karthikeyan Rajagopal^{2

3}, Nuha Alruwais⁴, Haya Mesfer Alshahrani⁵, Hany Mahgoub⁶, Kamal M Othman⁷

Affiliations

¹ Department of Electronics and Communication Engineering, New Horizon College of Engineering, Bengaluru, India.
² Centre for Nonlinear Systems, Chennai Institute of Technology, Chennai, 600069, India.
³ Department of Electronics and Communication Engineering and University Centre for Research & Development, Chandigarh University, Mohali, 140413, India.
⁴ Department of Computer Science and Engineering, College of Applied Studies and Community Services, King Saud University, P.O.Box 22459, Riyadh, 11495, Saudi Arabia.
⁵ Department of Information Systems, College of Computer and Information Sciences, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia.
⁶ Department of Computer Science, College of Science & Art at Mahayil, King Khalid University, Saudi Arabia.
⁷ Department of Electrical Engineering, Umm Al-Qura University, Makkah, Saudi Arabia.

Abstract

In this article, we focus on optimising the SLM-PTS-CT (selective mapping, partial transmission sequence, circular transformation) hybrid method for optical non-orthogonal multiple access (O-NOMA) waveforms. The goal is to enhance the spectrum performance and practicality of O-NOMA systems while mitigating the PAPR issue through a hybrid approach. The SLM-PTS-CT hybrid method is applicable to O-NOMA waveforms, providing effective PAPR reduction. By dividing the data sequence into sub-blocks, applying phase factors, and rotating the phase of the subcarriers in such a way that the peaks of the signal are distributed more uniformly, the proposed SLM-PTS-CT achieves an optimal PAPR reduction while maintaining the benefits of O-NOMA. The efficiency of the proposed method is analysed by estimating the performance of several parameters, such as bit error rate (BER), PAPR, and power spectral density (PSD), by increasing the number of sub-blocks (S) and phase factor (P). Further, the proposed SLM-PTS-CT is compared with the conventional SLM-PTS, SLM, and PTS. The simulation results demonstrate that the proposed approach efficiently improves spectral efficiency, preserves BER performance, and reduces PAPR as compared with conventional methods.

Keywords: Hybrid SLM-PTS-CT; Optical-NOMA; PAPR; PTS; SLM; SLM-PTS.