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 SCFDE 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. © 2013 IEEE