PAPR Reduction and Performance Enhancement of Optical OFDM Communication Systems via Migrating Birds Optimization-Based SLM Technique

Abstract

In Intensity-Modulated Direct Detection Optical Orthogonal Frequency Division Multiplexing (IM/DD-OOFDM) communication systems, a lower Peak-to-Average Power Ratio (PAPR) is essential for improving system performance. In order to reduce the high PAPR, a Migrating Birds Optimization(MBO) is integrated with the classical Selective Mapping (SLM) method in IM/DD-OFDM system. This approach successfully optimizes the values of phase factors, minimizes the search numbers, and reduces computational complexity. To evaluate the impact of the MBO-SLM method on PAPR reduction performance, the parameters of the MBO-SLM method play a crucial role in decreasing the PAPR in an IM/DD optical OFDM system. The MBO-SLM method demonstrates improved Bit Error Rate (BER) performance, Power Spectral Density (PSD), and power saving performance compared to other PAPR reduction methods. Numerical results indicate that the proposed PAPR reduction method outperforms other existing methods for optical OFDM signals. Specifically, by implementing this technique in the IM/DD optical OFDM communication system, we achieved a decrease in PAPR from 10.5 dB to 4.95 dB at a Complementary Cumulative Distribution Function(CCDF) of 10–3, resulting in a reduction of 5.55 dB. Additionally, the computational complexity of the MBO-SLM method shows a 91% improvement over the Discrete Elephant Herding Optimization(DEHO) based Partial Transmit Sequence (PTS) method when the search number is set to 512.