Symbol cyclic shift-based DFT precoding for OTFS-VLC systems

In this paper, a symbol cyclic shift-based discrete Fourier transform (SCS-DFT) precoding for orthogonal time frequency space (OTFS) is proposed and experimentally demonstrated in the visible light communication (VLC) system. The proposed scheme effectively mitigates the channel fading effect of edge subcarriers caused by inter-symbol interference (ISI) when there is no cyclic prefix (CP) in OTFS. In addition, only a training sequence (TS) symbol can realize channel estimation and equalization, and it can reduce the implementation complexity. The experimental results demonstrated that, compared with the conventional OTFS modulation, the proposed SCS-DFT OTFS can enhance the transmission performance while maintaining the high spectral efficiency of the VLC system.