Fig. 1. Signal transmission model of CO-FBMC-OQAM system

Fig. 2. Waveform of the PHYDYAS prototype filter (K=4,M=512)

Fig. 3. Diagram of the training sequence presented in this paper

Fig. 4. Conjugate symmetry of the training sequence

Fig. 5. Intrinsic imaginary interference of PHYDYAS prototype filter. (a) n is even; (b) n is odd

Fig. 6. Simulation diagram of the CO-FBMC-OQAM system

Fig. 7. Timing metric function of the CO-FBMC-OQAM system. (a) Without PN sequence; (b) with PN sequence

Fig. 8. Channel-estimation capability of the proposed method in the linear fiber channel. (a) BER versus OSNR curves for the back-to-back scenario; (b) BER performance versus OSNR after 1000-km SSMF transmission; (c) BER as a function of fiber length when OSNR is 20 dB

Fig. 9. BER curves with the change of launching power for different methods after a 500-km nonlinear fiber transmission, in which the inset shows the signal demodulation constellation when the transmitting power is -6 dBm