interference

INVESTIGATION OF INTERFERENCE NOISES IN CHANNELS OF TRANSMISSION SYSTEMS BY VDSL2 + TECHNOLOGY

The paper presents the results of the interference noises research in transmission systems (TS) by VDSL2 technology when working on “twisted pair” cables. The research was carried out by analytical modeling of VDSL2-systems with frequency plan B8-6 [998-M2x-B] on UTP Cat.5e 4x0.5 cable using traditional orthogonal harmonic signals (OHS) and generalized class orthogonal harmonic signals of (GC OHS). The values of interference noise were evaluated in relative values as a percentage of the effective values of interference noise/signal.

Comparative analysis of interference, noise and losses in the mobile communication systems in millimeter wave range

The article analyzes the approaches to the mathematical modeling of mobile systems in the millimeter wave range. The architecture of a mobile network using Radio over Fiber (RoF) technology is considered which is proposed for forming and transmitting the millimeter-wave signals via fiber-optic communication lines. The noise of the optical heterodyne used for the formation of radio signals is analyzed.

Method of regularizing the problem of recovery of input signals of dynamic objects

The task of signal recovery is one of the most important for automated diagnostics and control systems. This task is computationally complex, especially when there are a lot of heterogeneous errors in the signals and recovery is to be performed in real time. The article deals with the application and investigation of a modified algorithm for the method of quadrature formulas for the numerical solution of the Volterra integral equations of the I kind in solving the problem of signal recovery in real time.

Synthetic frequency characteristics of near-surface layers under the seismic stations Trosnyk, Uzhgorod, and Mizhgirya

Purpose. In order to quantitatively estimate the dynamic effects of velocity structure under the three seismic stations of the Carpathian network spectral ratios between horizontal and vertical components of displacements on the free surface (frequency characteristics) depending only on parameters of the medium and defining its resonance properties have been calculated using the algorithm designed based on matrix method and the models constructed using the data of drilling in near surface layers. Methodology.

Synthetic and experimental frequency characteristics of near-surface layers under the seismic stations Trosnyk, Uzhgorod, and Mizhgirya

Purpose. In the paper, experimental spectral ratios between horizontal and vertical components of displacements from local earthquakes and noise recorded at the stations Uzhgorod, Trosnyk and Mizhgirya (frequency characteristics of the medium under the stations) are compared to synthetic ratios calculated using the velocity models built based on the data of drilling in near-surface layers; correlation between the resonance frequencies is evaluated, as well as the applicability of experimental and synthetic frequency characteristics in the regional seismological investigations. Methodology.