Fig. 1. Principle of synchronization unit circuit of receiver

Fig. 2. (a) 16-PPM information symbol; (b) frame structure diagram

Fig. 3. Schematic of FAS

Fig. 4. Autocorrelation properties of FAS

Fig. 5. Diagram of frame synchronization sequence relative offset

Fig. 6. Diagram of frame synchronization

Fig. 7. Schematic of systematic state transfer

Fig. 8. Relationship between PFA and K

Fig. 9. Relationship between Psynch and Pse with different K

Fig. 10. BER versus communication distance under different atmospheric turbulence structure constants

Fig. 11. Schematic of process of frame synchronization

Fig. 12. Schematic of synchronization simulation

Fig. 13. Diagram of simulation process of system synchronization