Browsing by Author "Falade, A. J"
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Item Effects of Ionospheric Scintillation on Communication Systems: GPS and Satellite(Published by Begell House Inc, 2017) Ajiboye, A; Abdulrahman, A. Y; Falade, A. J; Ajiboye, A. T; Zakariyya, O . S; Rahman, T. AThe increasing use of satellite communication and GPS operating at 3 GHz and above can be affected by scintillation. Therefore, the knowledge of scintillation, as well as its effects on communication systems (satellite and GPS) is important in the planning and designing of communication systems links. In the past, most of the scintillation prediction models were based on data collected from temperate climates. These models do not perform well in equatorial and tropical climates due to uniform temperature, high humidity and abundant rainfall. Due to the unavailability of the required experimental setup as a result of huge capital cost involved, the measured scintillation fade and enhancement data were extracted from the reported works in JCSAT3 beacon, Indonesia. The results of predicted and measured scintillation intensity (fade and enhancement) were compared by using a few scintillation models. The results of the statistical analysis show that the Otung model is most suitable for scintillation fade and enhancement predictions with the least %RMS errors.Item Evaluation of the Frequency Scaling Prediction Techniques Using Experimental Data(Published by Begell House Inc, 2017) Jimoh, B. B; Abdulrahman, A. Y; Falade, A. J; Oniyide, O; Zakariyya, S. O; Rahman, T. ALong-term statistics of measured slant-path attenuation above Ku-band are severely scarce in the tropical climate; due to the huge capital costs involved in the experimental setup and receiver margin required, which is very difficult to obtain by using a spectrum analyzer. The received signal becomes masked at heavy rain rates owing to the high noise level therefore the signal level could not be monitored. Therefore the frequency scaling technique is a useful and powerful tool for estimating the attenuation at a desired frequency when the measurement data are available at a particular, usually lower, frequency. The results of measured rain attenuation from a tropical climate in Malaysia were used to investigate the performance of a few frequency scaling techniques. The experimental results were obtained from the four experimental microwave links (15, 22, 26, and 38 GHz at a separation distance of 300 m) installed at UTM campus, Johor Bahru, Malaysia. The results of the statistical analysis show that the ITU-R model is the most suitable for the lower frequency (26 GHz), while the Drufuca model is most suitable one for the higher frequency (38 GHz).