Effects of frequency-domain deconvolution on suppression of multiplicative noise in an atmospheric laser communication system

Multiplicative noise brought about by atmospheric turbulence can cause performance deterioration of atmospheric laser communication links, leading to increased error rates. In this study, a method of frequency-domain deconvolution was proposed to filter out multiplicative noise in atmospheric laser communication systems. In the Gamma-Gamma channel model, the multiplicative noise in a 4PSK atmospheric laser communication system was filtered out using this method. The simulation computations were conducted over the constellation diagrams and bit error rates of the modulation signals before and after deconvolution. The results show that frequency-domain deconvolution can smoothly filter out multiplicative noise. The measured and simulated results for near-surface sighting distance under different weather conditions were basically consistent, showing that the proposed method can effectively suppress atmospheric turbulence and reduce the bit error rate of atmospheric laser communication systems.