Fig. 1. PS coding rules based on LDPC

Fig. 2. Constellation probability distribution diagram. (a) Normal 16QAM; (b) PS-16QAM

Fig. 3. Generation and demodulation schematic diagram of PS-OFDM signal

Fig. 4. Schematic of PS-OFDM-ROF system

Fig. 5. Optical spectra of MZM output signal

Fig. 6. Bit error rate (BER) versus transmit power

Fig. 7. Recovered constellation diagram of 16QAM-PS-OFDM signal. (a) Normal OFDM-RoF system; (b) PS-OFDM-RoF system

Fig. 8. PAPR curves of normal OFDM-RoF system and PS-OFDM-RoF system

Fig. 9. BER curves at different fiber lengths (L). (a) L=0; (b) L=10 km; (c) L=20 km