S. V. Saldaev – Applicant, Povolzhskiy State University of Telecommunications and Informatics

E-mail: ssv2123@yandex.ru

Unlike wired communication systems, in which signals are transmitted along optical or copper lines and, accordingly, their parameters (amplitude and phase) have a deterministic or quasi-deterministic nature, wireless communication systems deal with signals which parameters are random. Such signals can propagate both within line of sight and as a result of reflections from trees, buildings and other obstacles. Due to multipath propagation, at the expense of interference the signal at the receiving point is the sum of electromagnetic waves, each of which has its own amplitude and phase. In addition, there are also large diffraction losses. It is very important to take into account depolarization of electromagnetic waves, since each component (TE- and TM-waves) will have its own attenuation coefficient depending on the propagation conditions.

This article solves the problem of correct simulation of radio signal propagation routes in complex terrain, taking into account different groups of factors by using the developed combined propagation model.

The article also presents a technique of estimating the distribution of the received signal level within the service area with complex relief on the basis of the developed model. With the help of this technique, the results of the field distribution in the area of typical urban development have been obtained using antennas of linear and mixed polarization. On the basis of the obtained results, it has been concluded that it is advisable to use antennas of mixed polarization in the conditions of radio wave propagation along radio paths with complex terrain.

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