Fig. 1. Schematic diagram of O-OFDM system

Fig. 2. Transmission characteristic curves of LED

Fig. 3. Constellation diagram with the influence of noise. (a) Ideal LED; (b) bilateral clipping; (c) nonlinear LED

Fig. 4. EVM performance of ACO-OFDM system

Fig. 5. EVM performance of DCO-OFDM system

Fig. 6. BER performance of 4QAM ACO-OFDM system

Fig. 7. BER performance of 16QAM ACO-OFDM system

Fig. 8. BER performance of 64QAM ACO-OFDM system

Fig. 9. BER performance of 4QAM DCO-OFDM system

Fig. 10. BER performance of 16QAM DCO-OFDM system