Single carrier frequency domain equalization based on on-off-keying for optical wireless communications

Single carrier systems with frequency domain equalization (SC-FDE) have been recently proposed for optical wireless systems as alternatives to optical orthogonal frequency division multiplexing (OFDM) to reduce the peak-to-average power ratio (PAPR) of the transmitted signal and improve the system performance. However, these SC-FDE systems have either higher complexity or lower spectrum efficiency. In this paper a low complexity SC-FDE system based on on-off-keying (OOK) modulation is proposed. Theoretical bit-error-rate (BER) analysis is provided based on minimum mean square error (MMSE) equalization for the proposed system and typical optical SC-FDE and OFDM systems. Both analytical and numerical results show that the proposed system significantly outperforms existing SC-FDE and OFDM systems in terms of PAPR, BER and implementation complexity.