Peak-To-Average Power Ratio (PAPR) Reduction Using Discrete Invasive Weed Optimization (DIWO) in Coherent Detection Optical OFDM (CO-OFDM) Communication Systems

In this paper, a coherent detection optical OFDM (CO-OFDM) communication system is designed to provide 40 Gbps downstream signaling using Optisystem and MATLAB software. First, the classical Partial Transmission Sequence (PTS) technique is applied to the CO-OFDM system to reduce the Peak-to-Average Power Ratio (PAPR). Then, to further reduce the PAPR of the CO-OFDM signal, the PTS system is integrated with Discrete Invasive Weed Optimization (DIWO) to obtain optimized phase weighting factors, resulting in DIWO-PTS. The performance of DIWO-PTS is compared with that of Discrete Elephant Herding Optimization-PTS (DEHO-PTS) and Discrete Crow Search Algorithm-PTS (DCSA-PTS). Simulation results show that DIWO-PTS is the best technique in terms of BER performance and achieves minimum PAPR compared to DEHO-PTS and DCSA-PTS using the same number of searches. According to the simulation results, after applying DIWO-PTS to the CO-OFDM system, the PAPR at CCDF = 10 –3 is reduced from 10.42 dB to 5.85 dB, a reduction of 4.57 dB, whereas DCSA-PTS has a PAPR of 5.94 dB, a reduction of 4.48 dB, and DEHO-PTS has a PAPR of 6.03 dB, a reduction of 4.39 dB.