Fig. 1. Change of average BER with SNR under different conditions

Fig. 2. Change of average bit error rate with divergence angle of light beam under different conditions

Fig. 3. Change of average channel capacity C/B with SNR under different conditions

Fig. 4. Variation of average channel capacity C/B with beam divergence under different conditions

Fig. 5. Relationship between interruption probability and normalized decision threshold under different conditions

Fig. 6. Relationship between interruption probability and divergence angle of light beam under different conditions