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Title:	Performance analysis of a terrestrial free space optical (TFSO) communication system due to pointing error and atmospheric attenuation
Authors:	Abushagur Abdulfatah Abushagur Ghaith (P37720)
Supervisor:	Mardina Abdullah, Dr
Keywords:	Free space optical interconnects
Issue Date:	14-Dec-2012
Description:	Terrestrial Free Space Optical (TFSO) communication system or Wireless Optical Communication (WOC) system, is a technology providing a high data rate that is limited by the capabilities of current radio links. However, adverse weather conditions and the need of strict pointing stability between the two terminals involved in the link are the effects that most often result in a fading channel of the system. These effects should be studied and mitigated to ensure system availability. In this work, a power penalty of point-to-point with Bit Error Rate (BER) of 10-9 due to several adverse weather conditions and pointing error were evaluated; the BER’s average was investigated as a function of an atmospheric attenuation and the variance (σ2) of the radial pointing error. The atmospheric attenuation as a function of visibility due to different types of fog, haze and mist were calculated using Kim/Kruse model, and in the case of the rain, Carbonneau’s relation was used. For a real case, weather data for the year of 2009 from Malaysian Meteorological Department was used. Comparison analysis between the three different transmissions’ wavelengths, that is Near-IR (NIR) with wavelengths of 0.85 μm, 1.55 μm and Mid-IR (MIR) with wavelength of 10 μm, were carried out to investigate 1.25 Gb/s TFSO system performance in terms of data rate/available link margin as a function of the deployed distance. From both analyses, it was found that the fog is the most limiting factor as compared with the losses incurred by rain, mist and haze. In addition, radial pointing error did contribute to significant effects on the system performance as the standard deviation (σrms) of the angle increased. As for the adverse weather conditions, the performance is extremely dependent on the transmission’s wavelength. Results show that the adverse weather effect can be reduced with MIR, where the system link is enhanced by 10-20 times greater link margin and data rate compared to the conventional NIR. By using MIR, the TFSO link distance can be extended, such as in the case of a dense fog where the link distance is extended around 300 m. From these analyses, certain fade margin of a specified link’s distance, which can ensure availability and improve the quality of service demands for applications requiring high data rate communication can be applied.,Master/ Sarjana
Pages:	110
Call Number:	TK5103.592.F73A257 2012
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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