Mitigation of atmospheric turbulences using mode division multiplexing based on decision feedback equalizer for free space optics
In mode division multiplexing (MDM) free space optical (FSO) communication system, the atmospheric turbulences such as fog, rain, and haze cause adverse effects on system performance. This paper investigates the mitigation of atmospheric turbulences of FSO using MDM and decision feedback equalizer (...
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| Main Authors: | , , |
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| 格式: | Article |
| 語言: | English |
| 出版: |
De Gruyter
2017
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| 主題: | |
| 在線閱讀: | http://repo.uum.edu.my/27243/1/AlmogahedAmphawanFazeaJOC.pdf http://repo.uum.edu.my/27243/ http://doi.org/10.1515/joc-2017-0169 |
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| 總結: | In mode division multiplexing (MDM) free space optical (FSO) communication system, the atmospheric turbulences such as fog, rain, and haze cause adverse effects on system performance. This paper investigates the mitigation of atmospheric turbulences of FSO using MDM and decision feedback equalizer (DFE) with minimum mean square error (MMSE) algorithm. The implementation of the MMSE algorithm is used to optimize both the feedforward and the feedback filter coefficients of DFE. The proposed system comprises three parallel 2.5Gbit/s channels using Hermite-Gaussian modes. A data rate of 7.5Gbit/s over 40 m, 800 m, 1400 m, and 2km under medium fog, rain, haze, and clear weather, respectively, has been achieved. In addition, it is noticed that the link distance is reduced while increasing the attenuation. The simulation results revealed that a DFE improves the performance MDM FSO system while maintaining high throughput and desired low bit error rate. |
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