Investigation of Some Existing Prediction Models and Development of a Modified Model for UMTS signal in Owerri, Nigeria
Propagation of signals in wireless communication is the travelling of signals from one location to another without physical connection. In the course of propagating, the signals are susceptible to channel impediments such as obstacles, atmospheric factors which change in unpredictable manner and result in path loss and shadowing. The path loss occurs due to attenuation of power radiated by the transmitter. The existing empirical models used in predicting the path loss give different results in different environments other than where they are developed. In this paper, the prediction and modification of the models for Universal Mobile Telecommunication System (UMTS) signal in urban area of Owerri, Nigeria are carried out using the drive test and compared with path loss from existing COST 231 model, Stanford University Interim (SUI) and LEE propagation models. The path loss exponent is obtained to determine the path loss model with the UMTS station parameters. The performances of the models are evaluated using the path loss values. The results obtained show that the modified and predicted path loss models are the most suitable models for this environment. Also LEE model has the lowest values of path loss while the SUI has the highest values in this terrain. Therefore, COST 231, predicted model and the modified path loss model are around the measured values and can be used in this terrain to predict the UMTS signals for planning and budgeting.
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