Work

Intermediate Phase Rotation-Based Computational Complexity Reduction in DCO-OFDM

Year: 2026

Type: article

Abstract: The rapidly advancing domain of visible light communication (VLC) technology is immensely recognized as a potential adjunct to prevailing radio frequency (RF) systems, utilizing optical orthogonal frequency division multiplexing (OOFDM) to achieve superior data transmission rates, thereby aligning with the stringent requirements of 5G standards. Nevertheless, notwithstanding its substantial benefits, the inherent multicarrier architecture of OOFDM engenders constructive interference at certain subcarrier intervals in inverse fast fourier transform (IFFT) operation, thereby exacerbating the peak-to-average power ratio (PAPR). Among the plethora of PAPR reduction techniques, non-distorting methods such as selective mapping (SLM) have been unequivocally established as the most efficacious in attenuating the inevitably severe PAPR. However, the proliferation of candidate alternatives significantly escalates computational complexity, thereby presenting a formidable challenge in the practical application of SLM. To mitigate this complexity, the proposed methodology entails the multiplication of phase sequence vectors at a specific intermediate stage of the IFFT, thereby facilitating the generation of candidate signals. This novel approach results in a pronounced reduction in PAPR when compared to the conventional CSLM technique. Furthermore, the conjugate symmetry property of the first-stage IFFT output contributes to an additional reduction in PAPR, enhancing the overall efficacy of the system. The DCO-OFDM signal exhibiting the minimum PAPR across all candidates is selected for transmission, thereby optimizing the performance. Through rigorous complexity analysis and extensive simulation results, it is conclusively demonstrated that this innovative complexity reduction strategy not only surpasses the conventional CSLM method but also offers a promising solution for seamless integration into future-generation VLC systems.

Source: IEEE Open Journal of the Communications Society

DOI: 10.1109/ojcoms.2026.3735863