The article describes an approach to modeling information processes and evaluating their effectiveness in vehicular ad-hoc networks (VANETs). The results of numerical simulation of the interaction of edge devices in the traditional configuration and using a clustering approach to the partitioning of road-side units are presented. It is shown that in the transport network, this approach can significantly increase the percentage of serviced devices and minimize the overall delay of computing, which will significantly increase the efficiency of the dynamic system.

As a result of the analysis of methods for synthesizing radiation patterns, in order to find the required amplitude-phase distribution in antenna arrays with an arbitrary arrangement of radiating elements, a technique based on the method of partial radiation patterns is proposed. The results of implementing the technique for a lowprofile combined ring concentric antenna array, a five-element antenna array based on asymmetric wave channel antennas, and a conformal antenna array consisting of arbitrarily located PIFA antennas are presented. The calculated amplitude-phase distributions and radiation patterns are given. The technique makes it possible to evaluate the potential capabilities of antennas, with adaptation taking into account the mutual coupling.

IEEE 802.11 wireless networks design process is impossible without a correct choice of a channel plan, i.e. a set of channels of a given type. This is especially important because channel planning of a distributed network heavily depends on the network designer’s and administrator’s decisions. Additionally, the central frequencies of the channels provided by the standard do not mean that the channels are non-overlapping. However, considering the coverage of a flat area as a plane tessellation by coverage areas of access points, for a particular regular structure geometry, it is necessary to choose the best channel planning solution among the possible ones. To do this, it is required to consider practically applicable channel planning cases, which use different numbers of channels, as a plane tessellation problem, also taking into account the overlapping of their spectral masks. This paper considers channel planning of IEEE 802.11 networks as a plane tessellation with regular structures and proposes a model that takes into account the effects of adjacent-channel interference, provides evaluation criteria, and thus is applicable to select the best channel configuration for the corresponding regular structure.

An analytical method has been developed for determining the dependence of the fading frequency correlation interval in a single-beam decameter radio link on the ratio of the operating frequency to the maximum applicable frequency, the degree of ionospheric diffuseness (the intensity of small-scale irregularities), and the communication range (radio link length). This dependence is obtained as the product of the traditional fading frequency correlation interval in a single-beam decameter radio link by a reduction factor. It is substantiated that as the ratio of the operating frequency to the maximum applicable frequency increases, the value of the traditionally determined fading frequency correlation interval decreases, and the reduction factor increases. The optimal values of the operating frequency (relative to the maximum usable frequency) are established according to the criterion for ensuring the maximum values of the fading frequency correlation interval in a single-beam decameter radio link. It is shown that an increase in the decameter communication range leads to an expansion of the fading frequency correlation intervals, and an increase in the level of ionospheric diffuseness leads to an increase in the root-meansquare deviation of fluctuations of the wave phase front at the ionospheric outlet, which affects the decrease in the maximum value of the fading frequency correlation interval, which observed at a lower optimal value of the operating frequency in a single-beam decameter radio link. The results obtained will allow us to assess the noise immunity of signal reception at different values of frequency correlation intervals, including the occurrence of frequency-selective fading.

The evolution of 1G–4G mobile communication networks (MCNs) has shown that network positioning has traditionally been considered as one of the additional features in the process of standardization, construction, and operation of networks, which was in demand when the signals of global navigation satellite systems were unavailable. MCNs were used to determine location mainly in the interests of emergency services and law enforcement. However, the developed MCN infrastructure opened up wide opportunities for determining the location of devices. Therefore, in the process of evolution, starting with analog 1G MCNs, positioning methods were also improved. Digital 2G GSM MCNs contributed to the development of network positioning with an accuracy of tens or hundreds of meters at the request of the regulator. The globalization of MCNs is associated with the 3rd Generation Partnership Project (3GPP) for the standardization of 3G universal mobile telecommunications systems. Since the 3G generation, in the process of MCN standardization, the 3GPP specifications began to impose requirements for network location determination. This trend was continued in 4G LTE MCNs and further developed in 5G networks. For 5G networks, in the latest 3GPP specifications, in contrast to MCNs of previous generations, the requirements for positioning accuracy up to one meter are formalized for the first time. At the same time, in addition to the traditional 2G–4G cases of emergency calls, positioning scenarios are presented in public communication networks, both for subscribers and devices: location-based service, positioning in industry and healthcare, traffic control, rail and sea transportation, as well as positioning using unmanned aerial vehicles. To solve the ambitious task of positioning with an accuracy of up to one meter, which is approximately an order of magnitude less than in previous MCN generations, 5G networks at the radio interface level use special positioning reference signals (PRS), first proposed in 4G LTE MCNs. The new 5G NR radio interface, unlike the 4G LTE MCNs of previous generations, allows the use of an order of magnitude wider frequency bands in the millimeter-wave range (mmWave), which allows achieving meter positioning accuracy. From the point of view of collecting and processing primary measurements, the positioning accuracy is determined, first of all, by the signals used. Using the built-in functions of the 5G Toolbox extension package of the special Matlab software allows visualizing the PRS signal configuration procedures in the time-frequency domain of the 5G NR radio interface. The first part of the study considers 5G NR network positioning technology modeling and formalizes the PRS signal configuration procedures used to collect primary measurements. Simulation modeling of procedures for secondary processing of primary measurements with the resulting estimate of the coordinates of 5G NR devices is the subject of research in the second part. The result of this work is the substantiation of the problem of achieving meter accuracy of device positioning in networks of the fifth and subsequent generations, as well as setting the task of the secondary processing of primary measurements using configured PRS signals.

He semantic sign system is considered, represented by two different sets of elements, through which creative objects are created, correlated with the natural activity of man and Nature, reproducing numerous species of living organisms. Using the concepts and definitions of work processes in neural networks, the principles of creating neural transmitter images are considered. Formalizing the processes of creation of creative objects, a topological computational model of computer synthesis of neurotransmitter images with a variety of forms is presented.

Modern sound synthesis systems make it possible to implement various signal generation algorithms of higher complexity. The theory of sound synthesis actively uses the mathematical apparatus of analog and digital radio engineering and signal processing, however, it should be noted that the classical signal models used in acoustics are not adequate to real-world synthesized signals, mainly due to the significant complexity of the latter. This article presents some models of synthesized signals typical for practical use.

For radar and communication systems, the search for code sequences with good correlation properties remains one of important tasks. This work shows the results of the study of aperiodic autocorrelation functions of new code sequences based on persymmetric quasi-orthogonal circulants. The numerical values of the quality parameters such as: the maximum sidelobe level, integrated sidelobe level ratio, and merit factor are given. Applying new code sequences makes it possible to reduce the maximum sidelobe level of the aperiodic autocorrelation function, as well as to reduce the summary energy of the sidelobes, which makes it possible to conclude that their application is promising. The obtained results are aimed at stimulating scientific interest in new bases derived from quasi-orthogonal matrices, as a basis for the revision of signal coding algorithms.

The study of computer incidents is an important area of activity in the field of information security. The paper considers a method for describing the properties of objects of computer equipment to ensure post-incident audit. The investigation of incidents is considered by analyzing the properties of objects of volatile memory, non-volatile memory, and network traffic. These properties are presented as a set of attributes and are analyzed by applying graph theory. To solve the final problem of determining and formalizing a computer incident, various algorithms on graphs and sets of properties can be used. The paper presents a computational experiment of post-incident audit of computer equipment by the example of determining a computer incident. The presented method minimizes the amount of information processed by using only attributes for analysis.

The article describes the current state of Russian radio broadcasting industry, study and implementation of block diagram of the DRM Simulcast trial equipment configuration in FM band, based on the carried out a highpower field trial of the DRM system in DRM Simulcast mode during 2019 to 2020. Recommendations for DRM digital broadcasting system implementation during the transitional period in the VHF band in the Russian Federation is presented.

Traditionally, the most informative means of measuring the parameters of linear optical paths of fiberoptic communication systems is an optical time domain reflectometer with a simple probing signal. The disadvantages of such a reflectometer are known limitations on the dynamic range and resolution. To improve the listed characteristics, the paper considers the possibility of using the technology of correlation reflectometers with a probing signal in the form of fragments of pseudo-random sequences. The study carried out in this work proves the advantages of such reflectometers over traditional ones.