Fig. 1. Schematic diagram of optical MIMO system

Fig. 2. Variation curves of bit error rate of downlink SIMO system with average signal-to-noise ratio

Fig. 3. Variation curves of bit error rate of downlink system with zenith angles（SNR=50 dB）

Fig. 4. Variation curve of light intensity scintillation index with zenith angles

Fig. 5. Variation curves of bit error rate of downlink system with beam divergence angles

Fig. 6. Variation curves of bit error rate of uplink MISO system with average signal-to-noise ratio