Research on the performance comparison of three HACO-OFDM systems

In visible light communications, hybrid asymmetrically clipped optical orthogonal frequency division multiplexing (HACO-OFDM) is an attractive scheme with high power efficiency and high spectral efficiency. This paper compares the implementation complexity and receiving performance of three HACO-OFDM systems. The comparison results show that the implementation complexity of the HACO-OFDM system that eliminate noise through time domain signal processing(TD-HACO-OFDM) and the interference-free hybrid OOFDM(IF-HOOFDM) system is lower. In terms of receiving performance, IF-HOOFDM system has the best bit error rate (BER) performance on the asymmetrically clipped optical OFDM(ACO-OFDM) branch; When the clipping noise estimation is inaccurate, the BER performance of the TD-HACO-OFDM system on the pulse-amplitude-modulated discrete multitone (PAM-DMT) branch is significantly better than the other two systems, the BER performance of the IF-HOOFDM system on the PAM-DMT branch is better than the conventional HACO-OFDM system based on frequency domain processing(FD-HACO-OFDM).