Fig. 1. Principle of our scheme. (a) Structure of the I-Q alternate detection; (b) signal receiving method

Fig. 2. Block diagram of the experimental system

Fig. 3. Constellation diagram of the received signal. (a) Without frequency offset; (b) frequency offset is 2 GHz; (c) revised constellation diagram

Fig. 4. Experimental results. (a) Performance of BER; (b) sensitivity penalty caused by frequency offset

Fig. 5. Simulation block diagram. (a) Sender; (b) homodyne reception; (c) heterodyne scheme and our scheme

Fig. 6. Process of digital signal processing. (a) Homodyne and heterodyne detection schemes; (b) our scheme

Fig. 7. Structure of the equalizer

Fig. 8. Simulation results. (a) Performance of different schemes; (b) sensitivity penalty caused by different frequency offset

Fig. 9. Transmission performance