Fig. 1. Schematic of satellite laser communication

Fig. 2. Schematic of receiving aperture area and misaligned spot on the receiving plane

Fig. 3. System simulation model diagram and DSP core algorithm

Fig. 4. CMMA flow chart

Fig. 5. CMMA algorithm for demultiplexing of 16-QAM signal. (a) X polarization; (b) Y polarization

Fig. 6. Schematic of the quadric frequency offset estimation algorithm

Fig. 7. Constellation of 16-QAM

Fig. 8. Constellation of 16-QAM signal after carrier recovery. (a) X polarization; (b) Y polarization

Fig. 9. Received power and BER curves under different modulation modes at 100 Gb/s

Fig. 10. Comparison of QPSK and 16-QAM modulation spectra

Fig. 11. Direction error and BER curves of different modulation modes at transmission rate of 100 Gb/s

Fig. 12. Intersatellite distance varies with change of heart angle

Fig. 13. Intersatellite distance and BER curves of different modulation modes at transmission rate of 100 Gb/s