Li S L, Mao Z Y, Liu C H, et al. Analysis of the effect of cloud thickness on the performance of blue-green laser communication[J]. Opto-Electron Eng, 2020, 47(3): 190389. doi: 10.12086/oee.2020.190389
Citation: Li S L, Mao Z Y, Liu C H, et al. Analysis of the effect of cloud thickness on the performance of blue-green laser communication[J]. Opto-Electron Eng, 2020, 47(3): 190389. doi: 10.12086/oee.2020.190389

Analysis of the effect of cloud thickness on the performance of blue-green laser communication

    Fund Project: Supported by National Natural Science Foundation of China (6170012154) and Shandong Province "Taishan Scholars" Construction Project Special Funds (ts20081130)
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  • When the airborne laser transmitter is located above or in the center of the cloud, the cloud will reduce the laser communication performance. In order to solve this problem, the effects of different types of clouds on laser energy attenuation, signal-to-noise ratio (SNR), maximum symbol transmission rate and bit error rate are simulated and analyzed. It is concluded that the cloud mainly causes laser energy attenuation, which affects maximum transmission rate and bit error rate, but has little effect on SNR. For communication systems with link margin greater than 18.9 dB, 4 km cloud cover is allowed on the link. The effect of cloud on the maximum communication rate and bit error rate is mainly caused by inter-symbol crosstalk caused by time extension. Cirrus has little effect on communication performance, cumulus has a great impact on communication performance, and stratus, stratocumulus, and cumulonimbus have a greater influence on the communication performance, but the differences between the three types of clouds are small and could be not be distinguished. Altostratus cloud and nimbostratus have greatest influence on communication performance, of which nimbostratus has greater influence than altostratus cloud.
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  • Overview: Using airborne wireless optical communication, if the laser transmitter located above or in the center of the cloud, the quality of communication on the receiving end will be severely degraded. Therefore, effective measures should be taken to improve communication performance. It is necessary to analyze the influence of clouds on the performance of wireless optical communication, which provides a theoretical basis for the rate adaptation and channel equalization design when there are clouds on the link.

    In this paper, Vande Hulst formula is used to simulate the transmittance of blue-green laser passing through clouds, and calculate link margin and SNR. The monte carlo simulation method is used to simulate the waveform of the pulse passing through the thin clouds, and the waveform is fitted as a double gamma function. The relationship between the detection ratio of simulated pulse energy and the maximum symbol transmission rate is simulated. Stotts formula is used to calculate the time width of half power point, then estimate the maximum symbol transmission rate, and calculate the bit error rate in excess of maximum transmission rate.

    It is concluded that cloud mainly causes laser energy attenuation, which affects maximum communication rate and bit error rate, but has little effect on SNR. Cirrus has little effect on communication performance, stratus, stratocumulus, and cumulonimbus have a great influence on the communication performance, but the differences between the three types of clouds are small and could be not be distinguished. Altostratus cloud and nimbostratus have great influence on communication performance, of which nimbostratus has greater influence than altostratus cloud.

    From the perspective of laser energy attenuation, cloud plays a dominant role. For communication systems with link margin greater than 18.9 dB, 4 km cloud cover is allowed on the link. From the point of view of SNR, the influence of turbulence is still dominant, and the cloud thickness only reduces the SNR slightly, which is basically the same as that without cloud. From the perspective of maximum communication rate and bit error rate, the time expansion will be caused due to multi-path effect when the pulse passes through the cloud. The inter-symbol crosstalk will be caused when the communication rate is too high, so the communication rate will be limited. When the communication rate exceeds the maximum value, it will cause inter-code crosstalk, increase the bit error rate, and reduce the communication quality. The improved methods include the sending end rate adaptive and the receiving end channel equalization, which need to be further studied.

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