Line-of-sight optical communication channels are characterized by the high data rate, but they cannot provide stable data transmission in the presence of obstacles in the communication line. Non-line-of-sight (NLOS) optical communication is free of this shortcoming and can be multicast. We have created an optical-electronic system for NLOS communication at a wavelength λ=850 nm. It is shown that in the evening, NLOS communication is possible at a baseline distance of 75 m and receiver azimuth angles 0-40° with the symbol error rate no higher than 0.009. At a baseline distance of 1300 m and receiver azimuth angles of 0 5°, NLOS communication with the symbol error rate no higher than 0.236 is possible.
Non-line-of-sight (NLOS) atmospheric optical communication between an unmanned aerial vehicle (UAV) and a ground-based receiver is analyzed The experiments were conducted in nighttime at a wavelength λ = 450 nm with baseline distances up to 150 m and UAV altitudes up to 20 m. It is shown that if the altitude of UAV with a transmitter is 10 m, stable optical communication is possible with the symbol error rate no higher than 0.0002 at baseline distances up to 75 m. If the UAV altitude is 20 m, communication is possible with the symbol error rate of 0.015-0.031 at baseline distances up to 100 m.
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