Browsing by Author "Onidare, S.O."
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Item ENHANCED WCDMA POWER CONTROL MECHANISM USING KALMAN FILTERING AND LINEAR QUADRATIC GAUSSIAN APPROACH(ABACUS, 2016-09) Ayeni, A.A.; Onidare, S.O.; Babatola, A.; Adeniran, T.C.A good power control algorithm is very essential in a Wideband Code Division Multiple Access (WCDMA) system. This is to prevent Near - Far effect or Multi - Access Interference (MAI) and its associated effects, which include degradation of channel capacity and signal quality, as well as significant drain of the user equipment (UE) battery power. To solve these problems, there is the need for an effective and efficient power control mechanism to compensate for the fading fluctuations in the transmit power level of the mobile stations (MS) such that the signal power from multiple UE's (Near or far) is made equal at the Base Station. The conventional power control algorithm, based on SIR, may lead to positive feedback or power escalation when the far away MS increases its transmit power to compensate for the interference from the near MS. This paper proposes a method, based on predicting the state of the transmission channels to develop an improved power control mechanism in WCDMA systems. The proposed method uses Kalman filtering and Linear Quadratic Gaussian (LQG) control for channel prediction. Some conventional methods of power control in WCDMA such as Fixed Step size method, Quantized Step size method and Ideal Method are examined. The proposed method is then compared with the conventional methods using MATLAB. Analysis of the simulations show that the proposed method recovers faster from deep fades and provides a more steady performance than the conventional methods.Item Experimental Determination of Path Loss Exponent For GSM 900 and 1800 Bands in Ilorin Metropolis(ABACUS, 2016-09) Ayeni, A.A; Onidare, S.O.; Quadri, A.R.; Adeniran, T.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.Item Performance Analysis of Empirical Propagation Models for Fixed Wireless Application(International Journal of Information Processing and Communication, 2018) Adebowale, Q.R.; Adeniran, T.C.; Sowande, O.A.; Imam-Fulani, Y.O.; Onidare, S.O.; Sikiru, I.A.In this study, an efficacy assessment was carried out on 5 most widely used empirical propagation models by using MATLAB simulator to compare these models for FWA in both urban and suburban environment. Simulations were carried out at two different frequencies of 2.5 GHz and 3.5 GHz with a transmitter height of 30 m and varying distance from 250 m to 10 km. Three different receiver antenna heights of 3 m, 6 m, & 10 m were considered. The results indicated that, Ericsson model has the least prediction of 145 dB to 147 dB at 10 m and 6 m receivers’ antenna height respectively, operating on 2.5 GHz frequency in urban environment. Apparently, COST 231 Hata indicated the highest predicted path loss at 10 m and 6 m with predictions of 160 dB and 162 dB respectively in urban environment while the SUI model revealed the least variation of propagation loss of 136 dB to 138 dB. Similarly, the study revealed that Ericsson model has the lowest predicted path loss (150 dB to 153 dB) in an urban environment at 3.5 GHz. The study concluded that no specific model predicted the least path loss for both urban and suburban environment with the varying receiver antenna heights.