Wavelet-Aided OTFS for Optical Wireless Communication

Abstract

Orthogonal time frequency space (OTFS), a cuttingedge modulation technique, has gained attention as a potential prospect for future wireless communication. This paper incorporates wavelet transform in the conventional OTFS modulation, thereby presenting a method termed wavelet-aided OTFS (W-OTFS) modulation. The W-OTFS is then applied to optical wireless communication. In particular, a DC-biased optical W-OTFS (DCO W-OTFS) system is conceived, offering reduced spectral loss and peak-to-average power ratio (PAPR) in comparison to existing approaches. The proposed scheme outperforms both direct current optical (DCO) and asymmetrically clipped optical (ACO) OTFS schemes in terms of the PAPR and spectral efficiency. Additionally, the DCO W-OTFS is found to exhibit a lower bit error rate (BER) than the conventional DCO-based schemes.