Performance-enhancement ACO-FOFDM Scheme with DCT-spread Technique for OWC

In this paper, we propose a performance-enhancement asymmetrically clipped optical fast orthogonal frequency-division multiplexing (ACO-FOFDM) with discrete cosine transform-spread (DCT-S) technique for peak-to-average power ratio (PAPR) reduction and high-frequency attenuation mitigation in OWC system. At a probability of 10−3, the PAPR of the proposed scheme is approximately 3.8 dB and 2.8 dB lower than that of conventional ACO-FOFDM with binary phase-shift keying and 4-ary pulse-amplitude modulation, respectively. The numerical simulation results validate that, benefiting from the resistance of nonlinear clipping and high-frequency distortion in the OWC system, the proposed ACO-FOFDM with DCT-S technique can achieve a significant superiority of performance compared to its counterpart, which shows the great potential for OWC.