Ayo-Akanbi, Olaoluwa Adedapo and Covenant University, Theses (2023) DETERMINATION OF AEROSOL SCATTERING ATTENUATION ON TERRESTRIAL FREE-SPACE OPTICAL COMMUNICATION IN SELECTED LOCATIONS IN NIGERIA. Masters thesis, Covenant University Ota.
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Abstract
Free-Space Optics (FSO) is a new technology that allows the transmission of data through the propagation of light in free space. However, it is limited by various atmospheric parameters such as aerosol, temperature and humidity which has significant impact on its design, and attenuates the propagated signals which affects the performance and may lead to unavailability network for wireless communication. The impacts of these atmospheric parameters (visibility, temperature, and relative humidity) on the performance of terrestrial free space optical communication are investigated in this study using the Kim and Ijaz model. The study also looks into the seasonal influence on free space optical communication performance in response to high bandwidth communication demand in selected locations across Nigeria's six geopolitical zones, including Enugu, Lagos, Port Harcourt, Abuja, Kano, and Maiduguri. This study makes use of re-analysed data from the Visual Crossing (VC) archives spanning twenty-one (21) years (2000-2021). The visibility, temperature, and relative humidity of selected locations across Nigeria's six geopolitical zones were collected to determine the aerosol scattering attenuation on terrestrial free space optical communication for the FSO system design. The results show that attenuation values are higher (about 2.87 and 1.84 dBkm-1 for 850 and 1550 nm respectively in Kano) in the late dry season (DJF) and lower (about 0.88 and 0.41 dBkm-1 for 850 and 1550 nm respectively in Maiduguri) in the late wet season (JJA). During the study period, average visibility shows a decreasing trend during the dry season and an increasing trend during the wet season at all location. Furthermore, as the value of temperature increases, the value of relative humidity decreases. The wavelength of 1550 nm corresponding to a frequency of 193 THz, has the lowest aerosol scattering attenuation in all of the selected locations both in the dry and wet seasons. The findings of this study can be used to determine the suitable location where communication engineers can instal free space optical communication link for optimal performance.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Optical wireless communication, Attenuation, Weather condition, Scintillation, Aerosol scattering, Meteorological data. |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Physics |
| Depositing User: | nwokealisi |
| Date Deposited: | 20 Apr 2023 09:10 |
| Last Modified: | 20 Apr 2023 09:10 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/16830 |
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