In the recent years, the demand for data transmission over the cellular network has been growing at a fast pace. This growth implies that in the next decades, the cellular network will need to provide 1000 times the existing capacity. To meet this challenge, there is an increasing interest in the development of cellular systems operating at millimeter waves. The corresponding frequency spectrum range from 30 GHz to 300 GHz. In particular, the frequency bands centered around 28 GHz, 38 GHz, 60 GHz, 70 GHz and 90 GHz look rather promising for the next generation of cellular systems, allowing the use of 1-GHz wide channels (or even wider). During the propagation of both terrestrial and satellite links in the spectrum of millimeter waves, attenuation takes place due to absorption and scattering caused by atmospheric particles and hydrometeors. Scattering induced in the range of millimeter waves can cause co-channel interference between both fixed and mobile systems as well as between neighbor cells. Interference due to scattering caused by rain occurs as the electromagnetic transmitted energy of an antenna is intercepted by a rain cell. This leads to lateral scattering and antennas of other fixed systems, mobile system cells, or user equipment may receive the resulting interference signals. This affects the S/I ratio between the powers of the desired and the interference signals at the receiver. In this dissertation, a model will be presented to predict the interference power through scattering due to rain on the basis of ITU-R P.452-16 Recommendation. This model will be applied to determine the cumulative distribution function of the S/I ratio in urban scenarios (considering both regular and irregular structures) in the range of the millimeter waves.