Odd clipping optical orthogonal frequency division multiplexing for VLC system
The Orthogonal Frequency Division Multiplexing (OFDM) has emerged as one of the promising techniques because of its robustness to multipath fading with high-speed data transmission. Classical bipolar OFDM cannot be used in intensity modulated with direct detection (IM/DD) optical communication systems, as visible light communication (VLC), so many optical modulation techniques as asymmetrical clipped optical OFDM (ACO-OFDM) and DC-Clipped OFDM (DCO-OFDM) have been investigated. In this paper, we introduce a novel optical modulation scheme that meets the optical communications requirements. The proposed odd clipping optical OFDM technique (OCO-OFDM) is based on the Fourier transform symmetry properties in which the imaginary and odd signal is converted to odd and real valued signal. As a result of this work, the proposed OCO-OFDM and its modified version have several benefits over ACO-OFDM and DCO-OFDM. By introducing a better bit error rate, with the same spectral efficiency as DCO-OFDM and the same power efficiency as ACO-OFDM for real valued modulation technique as Binary Phase-Shift Keying (BPSK), and with the same spectral efficiency and power efficiency as ACO-OFDM for complex valued modulation technique as Quadrature Phase-Shift Keying (QPSK) and Eight Phase-Shift Keying (8PSK). © 2019 John Wiley & Sons, Ltd.