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In this work, we investigate the mutual synchronization dynamics in the system of two coupled by spin-waves spin transfer nanooscillators (STNOs). We artificially introduce a leader in the network by passing through it the high density of electrical current, which gives the large energy level (large amplitude of oscillations). We identify that the introduction of a leader, an oscillator having large...
This paper proposes a spectral analysis method for electrocardiosignal in I standard lead for identification of late ventricular potentials. A criterion for identifying the presence or absence of late ventricular potential is proposed which consists in a ratio of the high frequency part of electrocardiosignal to its low frequency section. Threshold values for identifying late ventricular potentials...
Electrochemical battery is the main power source for portable radio means one of the main redundant power source for stationary electronic means. The present paper is dedicated to the development of new method for estimation technical state of electrochemical power sources. There are a lot of effective diagnostic tools for electrochemical batteries however most of them require expensive experimental...
In the report signal and code constructions (SCC) on the basis of continuous phase frequency shift key (CPFSK-64, CPFSK-256, CPFSK-1024) using low-speed turbo codes are provided. In the course of simulation program models of the modulator, demodulator, coder and decoder on a high-level language C++ were developed for application in system of simulation modeling of the digital communication systems...
It is reported that the urgent task of radio engineering is the task of expanding the dynamic range of radio receivers and bringing it into line with the input effects in the real electromagnetic environment. The characteristic of the dynamic range and the problems associated with insufficient dynamic range. Found that building a reliable and multi-functional devices is impossible without wide dynamic...
Sigma-delta modulation is a method of constructing the radio frequency linear power amplifier with the using non-linear components. It can significantly simplify the structure of the power amplification path, which in this case shall operate as one-bit DACs. The preliminary modeling of potential different variants of the output stage in classes E, F, D (voltage switching and current switching) and...
Two methods of calculation of distributed amplifiers and research its energetic characteristics are discussed in the paper. Based on the results of the research is chosen the most suitable method for calculating the distributed amplifier.
Development of modern infocommunication and radiotechnical systems demands creating of postcorrelation theory for adequate representing of signal-noise situation when signals and noises have non-Gaussian distributions. In the report, the proof of the existence of integral transformation of one-dimension variate is presented. Conditions of existence and properties of stochastic spectra are shown. The...
The paper is devoted to analysis of the heart rate variability using the cardiointervalogram of patients with bradycardia. As a result of the analysis we showed in our work that it is possible to detect the time-domain moment of the person's transition from the waking state to the state of sleep. This problem is rather actual for drivers of vehicles to prevent the car accidents. We suggested the special...
We consider the problem of PSK-n signal reception over linear radio channel in the presence of strong intersymbol interference. Particularly we provide results of probability of error estimation within the problem. It's shown that probability of error depends on initial shift of signal constellation and recommendations for the initial shift are provided.
Based on the requirements for creation a clock network synchronization system, it has been shown necessary to organize a check (audit) of the synchronization network, for which there is currently no full regulatory base. Proposals were made to create an appropriate regulatory base, including at the ITU-T and ETSI level.
The development of the technology of fiber-optic sensors is inextricably linked with the development of the technology of fiber-optic telecommunication systems (FOTS). The increased capabilities of telecommunication technologies allow the creation of spatially spaced and multidimensional sensor networks. On the other hand, the development of sensor technologies, in turn, allows the creation of highly...
the task of full-focused digital images construction relates to computational photography and is a process of increasing the information capacity of images obtained via photo- and video-fixation devices with limited optical depth of field. Additional to this task is the question of automatic evaluation of the quality of the images. The most popular non-reference metrics for comparing the quality of...
High quality of the provided communication services can be reached by package networks by the organization of network synchronization of the time scales (TS). The report summarizes the experience of comparing the TS of the leading watches of the corporate telecommunication network with the state time scale - UTC (SU). The methods of realization of checking of a time scale and methods of distribution...
The problem of creation of quasi-orthogonal signals ensembles with a large number of isomorphic transformations to improve the structural secrecy of asynchronous address radio systems is considered. The chosen subclass of the code sequences ensembles is characterized by a set of options of isomorphic sets creation, the search and enumeration of which is a nontrivial computational problem. Justification...
Algorithms for estimating the symbol rate of signals with modulation types M-PSK and M-FSK are presented. The algorithm for estimating the symbol rate of the M-PSK signals is based on the Fourier transform of the squares of the modules of the complex envelope of the signal. The algorithm for estimating the symbol rate of M-FSK signals is based on the separation of the spectrum of the original signal...
The problem of quasioptimal linear filtering electrical signals of industrial frequency in input circuits of devices of relay protection and automatic equipment taking into account requirements of the GOST 32144-2013 to levels and frequencies of harmonic components of electrical voltage. There is a transfer function of the filter, and also implementation of such filters is discussed. Are calculated...
On the base of the complex differential-difference equation method, the effective methods of interpolation/approximation for signal envelopes of the linear and quasi-linear dynamic systems are offered taking into account the fundamental frequency order. Examples of the operator model synthesis are given for frequency selective systems including quasi-harmonic autonomous systems.
this work considers the algorithm of mobile robot recognition and localization on the basis of color patterns, applied in robosoccer. For exact position definition of mobile robots and a ball in robosoccer it is necessary to analyze the image received from camera. Whereas each of these objects on the image has the color pattern consisting of circles, the first step of algorithm is detecting of circles...
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