A Low PAPR DST-based optical OFDM (OOFDM) for Visible Light Communication

Abstract

The unprecedented increase in the mobile data traffic leads to congestion of the prevailing radio frequency (RF) spectrum. To fill in the existing gap, definitely alternative communication technologies are necessary to increase the reliability of services. One such emerging technology is Visible Light Communication (VLC) which exploits a simple device such as the Light Emitting Diodes (LEDs) meant to be served for the dual purpose of assuring simultaneous illumination and communication along with the assurance of energy-efficiency. For the provision of addressing the limited modulation bandwidth of LEDs, orthogonal frequency division multiplexing (OFDM) is adopted for VLC. However, the signal transmission should be assured of its real and positive nature. A discrete sine transform (DST) based optical OFDM (DST-OOFDM) system is proposed in this work in contrast to Hermitian Symmetry imposed inverse fast Fourier transform (IFFT) as used in traditional OOFDM system. This work analyses the performance of DST-based DC-biased optical OFDM (DST-DCO-OFDM) and DST-based asymmetrically clipped optical OFDM (DST-ACO-OFDM). Additionally, DST-based spreading is enforced in the proposed multicarrier system like DST-DCO-OFDM system to reduce the PAPR.