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International Journal of Antennas and Propagation
Volume 2018, Article ID 2162570, 7 pages
https://doi.org/10.1155/2018/2162570
Research Article

A Novel Radio Wave Propagation Modeling Method Using System Identification Technique over Wireless Links in East Africa

1Department of Electrical Engineering, Institute of Science, Technology and Innovation, Pan-African University, Nairobi, Kenya
2Department of Electrical and Telecommunication Engineering, School of Electrical and Electronic Engineering, Faculty of Engineering and Technology, Technical University of Kenya, Nairobi, Kenya
3Department of Electrical and Electronics Engineering, Dedan Kimathi University of Technology, Nyeri, Kenya

Correspondence should be addressed to Solomon T. Girma; moc.liamg@mhst.nomolos

Received 21 May 2018; Revised 3 September 2018; Accepted 17 September 2018; Published 26 November 2018

Academic Editor: Stefano Selleri

Copyright © 2018 Solomon T. Girma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Transmission of a radio signal through a wireless radio channel is affected by refraction, diffraction and reflection, free space loss, object penetration, and absorption that corrupt the originally transmitted signal before radio wave arrives at a receiver antenna. Even though there are many factors affecting wireless radio channels, there are still a number of radio wave propagation models such as Okumura, Hata, free space model, and COST-231 to predict the received signal level at the receiver antenna. However, researchers in the field of radio wave propagation argue that there is no universally accepted propagation model to guarantee a universal recommendation. Thus, this research is aimed at determining the difference between the measured received signal levels and the received signal level calculated from the free space propagation model. System identification method has been proposed to determine this unknown difference. Measured received signal levels were collected from three randomly selected urban areas in Ethiopia using a computer, Nemo test tool, Actix software, Nokia phone, and GPS. The result from the simulations was validated against the received experimental signal level measurement taken in a different environment. From the simulation results, the mean square error (MSE) was 4.169 dB, which is much smaller than the minimum acceptable MSE value of 6 dB for good signal propagation, and 74.76% fit to the estimation data. The results clearly showed that the proposed radio wave propagation model predicts the received signal levels at 900 MHz and 1800 MHz in the study region.