Dr. Yan Wu Profile

Dr. Yan Wu

at Huainan Normal Univ

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Proceedings Article | 2 December 2020 Paper

Analysis of performance of FSO communication system based on EW turbulence and pointing errors under aperture averaging

Yan Wu, Haiping Mei, Congming Dai, Heli Wei

Proceedings Volume 11717, 1171703 (2020) https://doi.org/10.1117/12.2576034

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In this paper, we investigate that the effects of weather, turbulence and pointing errors on laser beams, and establish a joint channel statistical model, then derive the performance parameters of free space optical communication system based on OOK modulation, such as average bit error rate, average channel capacity and outage probability, and finally derive their new expressions by using Meijer’s G function and H function. For an atmospheric laser communication system with a wavelength of 1550 nm and a link length of 1 km, the performance parameters of the system are simulated and analyzed. The results show that when the standard deviation of jitter is small, the communication system is obviously affected by turbulence, and the performance of communication system with different turbulence can be significantly improved by the aperture average effect; aperture averaging can also significantly compensate for the deterioration of the communication system performance due to the decrease of atmospheric visibility; when the standard deviation of jitter is large, the system performance is limited by the average aperture effect.

Proceedings Article | 10 November 2020 Paper

Performance simulation and analysis of space-ground FSO communication system

Yan Wu

Proceedings Volume 11604, 1160402 (2020) https://doi.org/10.1117/12.2579396

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The performance of space-to-ground laser communication system is mainly affected by free space and atmospheric environment. First, the effects of atmospheric environment (fog, cloud, turbulence), beam spread, ATP pointing errors, and sky background radiation on the communication system are analyzed. And the closed-form expressions of performance parameters of the intensity modulation/direct detection communication system such as link margin, achievable data rate, and bit error rate obtained by using the received signal optical power and the received sky background optical power. The influence of atmospheric environment on the performance of 1550nm wavelength space-to-ground laser communication system is simulated and calculated. The results show that turbulence has the greatest influence on the performance of air-to-ground laser communication, followed by fog; when 16-PPM modulation scheme is adopted, the communication distance and performance are greatly improved; when the atmospheric environment is weak turbulence, cirrus cloud and visibility is greater than 5 km, the maximum bit error rate is 10^-105 orders of magnitude on the communication link with angle of elevation of 30 degree and altitude of 12 km.

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