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

Area of Science:

• Optical Communications
• Signal Processing
• Wireless Networks

Background:

• Optical Non-Orthogonal Multiple Access (O-NOMA) systems offer enhanced spectral efficiency but face challenges with high Peak-to-Average Power Ratio (PAPR).
• Existing methods for PAPR reduction in O-NOMA systems require further optimization for practical implementation and performance.
• The Selective Mapping (SLM), Partial Transmission Sequence (PTS), and Circular Transformation (CT) techniques are individually used for PAPR mitigation.

Purpose of the Study:

• To optimize the SLM-PTS-CT hybrid method for O-NOMA waveforms.
• To enhance the spectrum performance and practicality of O-NOMA systems.
• To mitigate the PAPR issue in O-NOMA systems through an advanced hybrid approach.

Main Methods:

• A hybrid SLM-PTS-CT method is proposed and applied to O-NOMA waveforms.
• The data sequence is divided into sub-blocks, phase factors are applied, and subcarrier phases are rotated for uniform peak distribution.
• Performance is analyzed by varying the number of sub-blocks (S) and phase factor (P), evaluating Bit Error Rate (BER), PAPR, and Power Spectral Density (PSD).

Main Results:

• The proposed SLM-PTS-CT method achieves significant PAPR reduction in O-NOMA systems.
• The method effectively improves spectral efficiency while maintaining BER performance.
• Simulation results show superior performance compared to conventional SLM-PTS, SLM, and PTS methods.

Conclusions:

• The optimized SLM-PTS-CT hybrid method is highly effective for PAPR reduction in O-NOMA systems.
• This approach enhances spectral efficiency and preserves signal integrity, making O-NOMA systems more practical.
• The proposed method offers a superior alternative to conventional PAPR reduction techniques for O-NOMA applications.