Research on Transmission Performance of Multiple-Input Multiple-Output Optical Communication in Atmospheric Turbulence

The fluctuation of light intensity caused by atmospheric turbulence is the main factor affecting the signal-to-noise ratio and bit error rate of the laser communication system. This paper proposes a new method to analyze the channel transmission performance of multiple-input multiple-output free-space optical communication systems using improved space diversity technology in different turbulent environments. This method uses the gamma-gamma distribution model to analyze the atmospheric turbulence process, and converts the distribution of the optical field into an interference function based on multi-scale collisions. The differential phase shift keying coherent intensity modulation method is used to control turbulence, so that the transmitter and receiver can obtain channel state information. By constructing a system model and a multiple-input multiple-output channel model, a multiple-input multiple-output free-space optical communication (MIMO-FSO) system is formed, and an improved maximum ratio combining modulation MIMO-FSO system channel technology is used to analyze the MIMO-FSO system channel Transmission performance. Experimental results show that the improved method can reduce the bit error rate and interrupt probability of free-space optical systems, and has certain advantages compared with traditional systems.