Browsing by Author "Ndinechi, M. C."

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    A practical guide to site selection for communication antennas and their support structures in Nigeria
    (SAVAP International, 2013-01) Agubor, C. K.; Ndinechi, M. C.; Opara, R. O.
    Radio broadcasting and telecommunication transmitter stations should have their antennas properly positioned to make them capable of providing the required services. Suitable location of antenna structure will enhance signal clarity, wider coverage area and satisfactory reception of radiated signal. In most cases, engineering considerations in the determination of a station’s performance are treated analytically. However, it is important to know that the ability to serve large audience effectively and at the same time achieve wider signal coverage are greatly affected by the excellence of the transmitter location and its selection must be governed or influenced by experience with intangibles not subject to mathematical calculations. Field survey method was adopted by which information from the major radio and wireless Operators in the country was obtained. The paper therefore focuses on the various factors guiding the selection of suitable transmitter sites. It also presents a step-by-step guide and some important considerations to be taken into account from the planning to the site-acquisition stages. It recommends colocation of infrastructures which is an option not yet attractive to Service Providers in Nigeria.
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    Comparative analysis of multiple and single antenna applications in mobile wireless communication
    (SAVAP International, 2014) Agubor, C. K.; Ndinechi, M. C.; Chukwudebe, G. A.; Opara, F. K.
    The performance of multiple-antenna and single antenna systems as applicable in mobile wireless communication are compared. The method applied involves matrix computation based on the system model. The expressions derived were used to evaluate the system performance with zero-forcing (ZF) equalizer at the receiver. MATLAB Toolbox version 7.0 was used to carry out error performance simulation for the different transmitting and receiving antenna configurations in a Raleigh fading environment. The result showed in terms of BER performance that multiple antenna technique is capable of combating multi-path effects due to the low error rate they exhibited. The diversity modes employed by the multiple antennas were also analysed by comparing their / (Energy per bit to noise power spectral density ratio). Transmit diversity technique with multiple antennas at the base station and a single antenna at the remote end was further shown to be a better candidate for the next generation of wireless communication than the single-input single-output system.