Browsing by Author "Adebowale, Quadri R."

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    Experimental Determination of Path Loss Exponent for GSM 900 and 1800 Bands, in Ilorin Metropolis.
    (ABACUS, The Journal of the Mathematical Association of Nigeria, 2016) Ayeni, Adeseko A.; Onidare, Samuel O; Adebowale, Quadri R.; Adeniran, Temitayo C.
    The path loss exponent of an environment describes the propagation behaviour of the environment. This paper determines the path loss exponent of the GSM 900 MHz and 1800 MHz bands in Ilorin, Kwara state of Nigeria. A comprehensive signal strength measurement campaign, using an Agilent spectrum analyzer, was carried out in 12 different routes representing, virtually, the entire metropolis of Ilorin. In computing the path loss exponent, a different approach from the more frequently used linear regression approach, was used. The experimental data reveal a lot of findings, chief amongst which is the strong influence of the terrain profile on the path loss of the environment. Consequently, the path loss exponent obtained, especially for the GSM 900, is lower than the expected value as reported in the literatures.
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    PERFORMANCE ANALYSIS OF EMPIRICAL PROPAGATION MODELS FOR FIXED WIRELESS APPLICATION
    (Faculty of Communication and Information Sciences, University of Ilorin, Nigeria, 2018) Adebowale, Quadri R.; Imam-Fulani, Yusuf Olayinka; Sikiru, Ismaeel Abiodun; Sowande, Olugbenga A.; Adeniran, Caroline T.; Onidare, Samuel O.
    In this study, an efficacy assessment was carried out on 5 most widely used empirical propagation model has the lowest predicted path loss (150 dB to 153 dB) in an urban environment at 3.5 GHz. 3.5 GHz with a transmitter height of 30 m and varying distance from 250 m to 10 km. Three dB and 162 dB respectively in urban environment while the SUI model revealed the least suburban environment. Simulations were carried out at two different frequencies of 2.5 GHz and models by using MATLAB simulator to compare these models for FWA in both urban and COST 231 Hata indicated the highest predicted path loss at 10 m and 6 m with predictions of 160 that, Ericsson model has the least prediction of 145 dB to 147 dB at 10 m and 6 m receivers’ variation of propagation loss of 136 dB to 138 dB. Similarly, the study revealed that Ericsson The study concluded that no specific model predicted the least path loss for both urban and antenna height respectively, operating on 2.5 GHz frequency in urban environment. Apparently, different receiver antenna heights of 3 m, 6 m, & 10 m were considered. The results indicated suburban environment with the varying receiver antenna heights.
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    Spatial Variability Study of Duty Cycle in GSM 900 and 1800 MHz Bands in Rural and Urban Environments
    (Indonesian Journal of Electrical Engineering and Informatics (IJEEI), 2019) Faruk, N.; Imam-Fulani, Yusuf Olayinka; Sikiru, Ismaeel Abiodun; Oloyede, A. A.; Adebowale, Quadri R.; Olawoyin, L. A.; Abdulkarim, A.; Adediran, Y. A.
    This paper examines the spatial variability of duty cycle in the GSM 900 and high negative correlations exits between urban 900 and rural 1800, and urban the regulatory bottlenecks to maximize the scarce radio resources in the 1800 MHz bands within Kwara State, Nigeria. The results show spatial abundance of unutilised spectrum within the GSM bands. Therefore, 1800 and rural 1800. There is a weak and negative correlation between rural variance in the duty cycle with average occupancies of 1.67%, 17.76%, and urban 900 MHz, rural-urban 1800. These results clearly show the correlation between rural 900/1800 MHz and urban 900/1800 MHz. But very 900 and 1800 MHz bands. Findings also show that there is very high positive 10.55% and 0.39%, 11.00% and 5.11 in therural, urban and all locations for regulatory commissions should adopt flexible spectrum reuse strategy to relax licensed bands, especially for rural network deployments