Coding architecture for optical eU-OFDM transmission over AWGN

To improve the power-spectral efficiency trade-off of intensity-modulated direct-detection (IM/DD) optical transmissions, enhanced unipolar orthogonal frequency-division multiplexing (eU-OFDM) was recently introduced. Uncoded eU-OFDM systems have been presented in literature but coding techniques to further improve the reliability of transmissions over such systems have not yet been explored. Applying off-the-shelf codes to these systems does not lead to the best performance. In this paper, we propose a novel structured encoding-decoding architecture that is suitable for successive interference cancellation (SIC) required in eU-OFDM. Simulation results obtained so far show that the proposed code structure outperforms the off-the-shelf coded systems.