Browsing by Author "Fakolujo, O. A."

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    Passive Mobile Cellular Network Infrastructure Sharing: An Analysis of Wind Loading on a Multi-Operator Telecommunication Tower
    (Department of Civil Engineering, University of Ilorin, Nigeria, 2017-07) Ehiagwina, F. O; Afolabi, A. S.; Fakolujo, O. A.; Kehinde, O. O.; Oseni, G. M.; Anifowose, J. J.
    In order to overcome challenges militating against the rapid deployment of mobile cellular infrastructure, it is technically and economically crucial for a number operators to share mobile cellular infrastructure such as power supply, base station (BTS) cabin and telecommunication tower. For an efficient tower sharing, an analysis of tower’s wind loading and the tower bending moment have to be performed. In this work, we performed wind loading analyses for a multi-operator mobile cellular network. It was verified that as the number of operators increase, the wind loading value also increases. This work further observed that as the value of the antenna tilt increases, the tower wind loading proportionately increases. However, as the wind direction deviates from the normal, the wind loading reduces slightly. Finally, for six mobile cellular network operators, with total tower height set at 55m, the bending moment at a rare wind speed of up to 67 m/s was evaluated to be. It is vital that the bending moment of the telecommunication tower be lesser than the manufacturer’s specified tower bending moment limit. The results obtained from this research can be used to tighten tower survivability criterion. It will also serve as a useful tool to mobile cellular equipment designers and installers.
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    Sensitivity Degradation and Antenna Isolation Analyses for a Multi-Operator Global Systems for Mobile Communication Base Transceiver Stations
    (Faculty of Engineering, University of Nigeria, Nsukka, (UNN) Nigeria., 2019) Ehiagwina, F. O.; Afolabi, A. S.; Surajudeen-Bakinde, N. T.; Fakolujo, O. A.
    In other to mitigate challenges associated with the expansion of Global System for Mobile Communication (GSM) systems, infrastructure sharing have been proposed and adopted by some GSM operators. When infrastructure sharing is done, there is the possibility of degradation of quality of service due to Electromagnetic Compatibility issues, interference between operators, sensitivity degradation, increasing noise floor, antenna isolation requirement issue. This paper analyses the sensitivity degradation and the effects of spatial separation on antenna isolation requirement of Base Transceiver Station (BTS) receiver for a multi-operator mobile cellular systems. The data used were extracted from standards of organisation like European Telecommunications Standards Institute (ETSI) standards and others. Antenna dimension were obtained from physical observations of BTS site. By comparison with identified metrics in the standards, we verified that the number of operators that can share infrastructure is limited by the allowable sensitivity degradation. It was noted that an antenna isolation of 70dB can be achieved for GSM 900 band antennas and when GSM 1800 band antennas are used, 90dB antenna isolation is achievable greater than the minimum recommendation of 30dB.