Prediction of radio waves propagation parameters when employing low-lying antennas in conditions of urban development

Antennas, SHF-devices and technologies


Аuthors

Tikhomirov A. V.*, Omel'yanchuk E. V.**, Semenova A. Y.***, Mikhailov V. Y.****

National Research University of Electronic Technology "MIET", 1, Shokin Square, Zelenograd, Moscow, 124498, Russia

*e-mail: radiotav@yandex.ru
**e-mail: omelia81@gmail.com
***e-mail: semenova.anastasia.y@gmail.com
****e-mail: mikhvikt@gmail.com

Abstract

Design of ground mobile communication systems operating in urban conditions, including episodic networks, requires accounting for the effects of various factors of radio waves propagation on the received signal parameters. Depending on the types and urban building density the signal may contain include line-of-sight, reflected, diffracted and refracted components [1]. In the absence of a priori knowledge of obstacles’ type, size and shape the path loss can be estimated based on measurements. Empirical estimation should bear statistical character and based on determination of median values of path loss.

Due to the terrain and building types variety as well as the relative position of transceivers and, hence, difficulty to predict the effect of particular factors along the propagation pass on radio waves damping, a universal model for losses calculation while radio waves propagation in urban conditions does not exist. Models for predicting the signal level in ground mobile radio communications system can be employed only in cases of mobile networks with highly raised antennas of basic stations. Due to the growing popularity of the urban wireless networks (WLAN) and mobile ad hock networks, implicating a large number of mobile transponders, the purpose of this study is predicting of radio waves propagation at low-lying antennae in urban conditions by modifying the existing models on the ground of experimental data.

Based on the experimental study at the frequency of 870 MHz performed in Zelenograd, radio waves propagation losses were determined in conditions of urban building. The obtained experimental values of propagation loss were applied for linear approximation. The values of coefficients were determined and Stanford University Interim (SUI) model modification was suggested for urban media for the cases of antenna suspension height of up to 10 m. The article demonstrates that while estimating radio signal propagation in urban conditions with low-lying receiver antennae the attenuation degree equal to four can be employed.

Keywords:

radio wave propagation, propagation in urban area, empirical models, propagation loss

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