Fig. 1. Wide-range frequency offset estimation method and frame structure for CO-FBMC/OQAM system. (a) Wide-range frequency offset estimation method for CO-FBMC/OQAM system; (b) frame structure of CO-FBMC/OQAM system

Fig. 2. Compositional structure of CO-FBMC/OQAM system. (a) Simulation platform of CO-FBMC/OQAM system; (b) electrical spectra of baseband signals; (c) optical spectra of baseband signals

Fig. 3. Relative estimation errors of four sequences in back-to-back (BtB) scenario

Fig. 4. BER of receiver as a function of OSNR for using random, CAZAC, and PN sequences

Fig. 5. EVM as a function of laser frequency offset (OSNR: 20 dB)

Fig. 6. EVM as a function of normalized IFO (OSNR: 20 dB)

Fig. 7. (a) BER of receiver as a function of OSNR in BtB scenario; (b)-(d) demodulation constellation charts with normalized IFO of 4 and OSNR values of 12 dB, 15 dB, and 18 dB, respectively

Fig. 8. BER of receiver as a function of OSNR after 800-km transmission

Fig. 9. Relative estimation error for proposed method and Schmidl's method