Low-Complexity Optical Transmitter Design for Future Generations

Abstract The burgeoning field of visible light communication (VLC) technology is seen as a possible complement to incumbent radio frequency (RF) systems, as it uses optical orthogonal frequency division multiplexing (OOFDM) to attain faster data rates to comply with 5G standards. Despite its benefits, the multicarrier structure of OOFDM acquires constructive additions at certain subcarrier intervals during the inverse fast Fourier transform (IFFT) operation, leading to increased peak values. Non-distorting peak-to-average power ratio (PAPR) reduction procedures, like as selective mapping (SLM), were confirmed to be the most effective method for lowering ineluctably severe PAPR amongst the other methods. The advent of numerous alternative candidates enhances computational complexity, thus form a major obstacle in SLM. To convert an input direct current-biased optical orthogonal frequency division multiplexing (DCO-OFDM) symbol into a series of candidates, the proposed SLM technique’s phase vectors are multiplied at a specific intermediate stage of IFFT. In top to this complexity reduction, the first stage IFFT output provides further reduction according to its conjugate symmetry property. The DCOOFDM signal, that has the smallest PAPR of all alternatives, is chosen for transmissions. According to the complexity analysis and simulation results, the computational complexity abatement strategy surpasses the conventional SLM (CSLM) technique that allows us to incorporate this technology into any future generation VLC systems.