In the first part of the paper, a theoretical justification is given for the existence and stability of solitons in an optical fiber without losses. The possibility of using solitons in optical communication systems is shown. The problems associated with the interaction of solitons are considered. The results of modeling the processes of soliton propagation along an optical fiber are presented. In the second and third parts, we will consider the conservation of soliton regime in an optical fiber by controlling losses and dispersion in the linear path of a fiber-optic communication system.

The technique and results of solving the problem of diffraction of electromagnetic waves excited by a radiator placed on a GAZ-2330 vehicle are presented in the article. Calculations of the directional characteristics were carried out by the method of finite differences in the time domain. A study was made of the dependence of the directivity characteristics in the far zone of the radiator on its position on the car and on the frequency of the radiation. Based on the results of the calculations, recommendations were made on the placement of antennas, taking into account the decrease in the influence of the car on the distortion of the directional characteristics.

The current development of digital transmission systems increasingly focuses on the use of wideband data transmission methods based, in particular, on the direct sequence spread spectrum (DSSS). The use of wideband signals provides an increase in the efficiency of systems in terms of such indicators as noise immunity, a decrease in the energy of transmitted signals, an increase in the level of stealth of the process of data transmission over a noisy channel, an increase in the efficiency of the phasing system, etc. The most often choice for DSSS are maximum length sequences and Gold sequences, the characteristics and processing methods of which have been studied in sufficient detail and presented in many publications. The article is devoted to the sequences of the small set of Kasami sequences, which have a number of advantages over Gold and maximum length sequences. A new Kasami sequences small set processing approach based on a dual basis is considered.

The article considers the stages of the television systems development and the corresponding quality assessment criteria. The article reviews a method to improve the quality of three-dimensional image by the calculation of the number of depth plans based on the statistical data of stereo threshold. The results of experimental studies of the television and network parameters influence on the three-dimensional television image quality are presented. There are different ways of the video information estimation development within infocommunication systems in future

The sequence of solving the problem of restoring the network structure by adding edges article are described. Possible variants of the algorithms taking into account a number of characteristics of a network: the number of independent routes, structural survivability, timing and certainty of message delivery, the total number of spanning trees - are specified. An example illustrating the sequence of a specific task restore the network structure is given

The theoretical prerequisites for the transition to descriptions of nonstationary processes on the basis of their joint time-frequency energy distributions are considered. The reasons for the transition to joint forms of time-frequency descriptions for nonstationary processes are substantiated. The role and place of the Wigner function in the class of Cohen distributions are shown. Analytical expressions and experimental results are presented.

The results of theoretical and experimental studies of the transformation of picosecond pulses of an ytterbium laser (λ = 1030 nm) in silica-based microstructured fibers with an extremely high air-filling fraction and a core of diameters from 8 to 11 μm having a limited optical nonlinearity (γ = 2-3 1/(W·km)) are presented. The prevailing role of the four-wave mixing process in the nonlinear transformation of radiation in the anti-Stokes part of the spectrum has been discovered when pumping optical fibers in the normal dispersion regime.

The satellite communication system of the main test space center is considered. The analysis of the elements which are its part, their tasks, backbone components, and also the used technologies of communication is carried out. Mathematical modeling of execution of communication sessions is carried out. The problem definition of optimum planning and operational distribution of a radio resource of satellite communication system is formulated. As a solution`s method of an objective approach on the basis of the maximum principle of L.S. Pontryagin is selected.

The procedure for extracting the signal of nonlinear distortions arising in the sound paths of various devices with the simultaneous presence of frequency and dynamic distortions in the reproduced signal is described. The criteria for estimating their auditory perception and weighting coefficients that take into account the frequency and time response of the signal of nonlinear distortions are proposed. Preliminary experimental data confirming the dependence of the auditory perception of nonlinear distortions as a function of the tone structure of the signal and the spectral distribution of the "noise-to-mask ratio" are obtained.

The identification of line of sight in the processing of navigational measurements is relevant for positioning in urban conditions, as well as in heterogeneous terrain such as mountains and hills, when there is no direct visibility between the radio source and the receiving stations. The purpose of this work is to develop a complex simulation model for positioning between radio sources using time difference of arrival method in non-line-of-sight conditions.