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Timestamp: 2019-04-20 02:33:49+00:00

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Keywords: multichannel detection systems, combining signals with minimum and maximum selection, probability characteristic of detection.
The article devoted to the comparative analysis of two methods combining signals in multichannel systems.
In many radio systems are widely used multi-channel processing. In particular, when constructing a radar moving target detectors to improve their efficiency widely used the multichannel Doppler filters and notch multichannel filters. Thus, if in multi-channel Doppler filters the target signal can appear in one of the Doppler channels, in the multichannel notch filters the target may be in all the channels, since the velocity transparency zone of channels coincide. In this context, in multi-channel Doppler filter usually used the maximum selection in combining of channels. In the multi-notch filters it is preferable to implement minimum selection in combining of channels. It is interesting to compare the characteristics of these two methods of channels combining in relation to a multi-channel processing. Without loss of generality in solving the problem of comparing the effectiveness of two methods of channels combining the investigation was performed when type and efficiency of Doppler or multi notch filters in this study have been not considered. The attention was focused on different types of signal processing such as post detector integration, CFAR problem. It was assumed that at the input of minimum or maximum selection circuits in each channel was used in the quadrature square law detectors. And in each quadrature Gaussian noise acted with zero mean and unit variance. Noises in the channels were independent. Useful signals in all channels have the same random fluctuating amplitude and were also independent. It was shown, using analytical approach and MATLAB model verification of probability characteristics, that in the simple case the maximum detection method preferable. Using non coherent integration in each channel make both maximum and minimum methods equivalent. If after non coherent integration was used the adaptive constant false alarm rate device the minimum detection method become more affective for low detection probabilities.
2. Ryndyk, A.G. Ryabkov A.P. Multichannel notch filter with a minimum selection // News of Russian universities. Electronics. 2012. Vol. 4, p. 81-85 .
Keywords: : adaptive filter, spectral analysis, super resolution, the Steiglitz-McBride algorithm, chirp-signal, correlated interference, cross-links, notch filter, MTI system, pulse-compression filter, Doppler filter, filter weights generation.
The potential of implementation of two-channel adaptive systemwith filtering weights cross-control for the passive correlated interference suppression and using probing chirp-signal is presented in the article. The conditions under which considered system usage is theoretically acceptable and also certain spectral analysis super resolution techniques implementation is reasonable for the filter weights generation are adduced.The Steiglitz-McBride algorithm implementation yielded the best results in terms of the most efficient interference supрpression under certain conditions are presented. The adaptive MTI, which usage minimizes contained in input unclassified sample of observations wanted chirp-signalis proposed.
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2. Gordeev A.Yu., Bartenev V.G. Sposob adaptivnoj filtracii diskretnyx pomex. Zayavka na patent № 201314267208 ot 19.09.13. Publikaciya FIPS v Byul. №9 ot 27.03.15.
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4.	Bartenev V.G., Gordeev A.Yu. Primenenie metodov Proni i Shtejglica-MakBrajda dlya formirovaniya vesovyx koefficientov pri adaptivnoj filtracii neklassificirovannyx vyborok nablyudeniya. Trudy 14-oj Mezhdunarodnoj konferencii «Cifrovaya obrabotka signalov i ee primenenie» DSPA-2012. Moskva, 2012, S. 257-260.
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6.	Bartenev V.G., Gordeev A.Yu. Sravnitelnyj analiz effektivnosti adaptivnoj filtracii po metodu Proni i Shtejglica-MakBrajda. // Sbornik trudov 61 NTK MIREA. 2012. Ch. 3. S. 55-60.
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Keywords: the digital FIR-filter, multifunctional synthesis, integer nonlinear programming, digital filter with linear phase, integer design.
The phase response linearity is one of the key requirements for the digital filters performing the selection of the useful signal in a given frequency range. Current requirements for phase linearity of the transmission coefficient of the digital filter are very tough - phase distortion Δφ(ω) for most of DSP-applications should not exceed 1–3 degrees within the passband. The classic way of ensuring the linearity of the phase characteristic of the FIR filter, as is well known, the condition of symmetry (or anti-symmetry) of its impulse response. However, classical methods do not allow us to design linear phase FIR filter only in the desired bandwidth. Classic design can be obtained with real or even complex (for structures with frequency selection, for example) multidimensional state space only. This feature makes the solution complicate or even makes the implementation of this solution impossible on digital platforms with integer arithmetic, primarily in the FPGA and microcontrollers. This paper presents the statement and the solution of the problem of synthesis of digital FIR-filter with linear phase only in the specified passband by integer nonlinear mathematical programming. The article considers solutions of the problem of synthesizing an FIR-filter with symmetrical and with free integer coefficients. Comparative evaluation of selective ability according to the results of software implementation of those integer filters on a digital platform is presented.
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Keywords: alternating components, empirical mode decomposition.
The method of empirical mode decomposition, both in ascending and descending order of their frequencies, is substantiated. The method is based on suppression of high-frequency components at integration and on accentuation of high-frequency components at differentiation.
Recently the interest to empirical modes decomposition has been growing. The authors apply such decomposition as a signal preliminary processing, which allows increasing the signal/interference ratio, simplifying the algorithm of parametrical analysis due to transformation of a complex task of evaluation of the parameters of p model order into simple tasks of evaluation of components of first and second order, significantly reducing the period of analysis.
- to extract the modes in the descending order of their frequencies multiple differentiation is executed to accentuate high-frequency components, till the sequence with alternating extrema is extracted; the modes are extracted from differentiated sequences by integration, subtraction of the extracted component from differentiated sequences of lower-order, repetition of the same actions with an already withdrawn high-frequency component with differentiated sequences, starting with the previous one; the components extracted from the differentiated sequences are to be integrated with application of weighting as many times as the sequence has been differentiated.
1.	Myasnikova, N. V. Empirical modes decomposition application as the problem of signals digital processing / N. V. Myasnikova, L.A.Dolgikh, M.G.Myasnikova. // Sensors and systems. – 2011. – № 5. – page 8–10.
2.	Myasnikova, N. V. , Time-frequency distributions on the basis of extreme filtering/ N. V. Myasnikova, M.P. Beresten // Sensors and systems. – 2013. – № 10. – page 9–12.
3.	Myasnikova N.V. Empirical modes decomposition on the basis of extreme filtration // Myasnikova N.V., Beresten М.P. Digital signal processing. 2014. № 4. Pages 13-17.
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5.	Myasnikova, N.V. The algorithm of extraction of low-frequency modes / N.V. Myasnikova, М.P. Beresten // The 17th International conference ‘Digital signals processing and its application». Moscow. March 25–27, 2015. The works of the Russian scientific and technical society of radio engineering, electronics and communication named after A.S.Popov. Digital signals processing and its application. Series. – Moscow.: Russian scientific and technical society of radio engineering, electronics and communication named after A.S.Popov, 2015. – Pages. 78-82.
6.	Myasnikova, N.V. Empirical modes decomposition on the basis of differentiation and integration / N.V. Myasnikova, М.P. Beresten / Collected articles: Perspective information technologies (PIT 2015) The works of International scientific and technical conference. Samara State Aerospace University. Samara, 2015. – Pages 101-105.
7.	Myasnikova, N.V. The combined method of Empirical modes decomposition on the basis of differentiation and integration / N. V. Myasnikova, M.P. Beresten, A.A. Primak // Modern society, science and education: collection of scientific papers on the materials of the International scientific - practical conference in 16 parts . 31 March 2015. Part 8 Publisher: OOO "Consulting company Ucom " ( Tambov ) p. 76–77.
Keywords: auto-compensation, adaptation, adaptive rejecter filters, probabilistic criterion, optimization, clutter, energy criterion.
The object of the study are coherent signal detection of moving targets at the background clutter, performing coherent rejection followed by a multi-channel coherent accumulation rejection residues. As the rejection filter (RF) is considered an adaptive nonrecursive filter, and as coherent accumulator - multichannel filter (MF). The subject of research are the methods of parametric optimization of systems for detection of coherent signals on energy and probabilistic criterion. Objective - to compare the effectiveness of signal detection systems optimized for energy and probabilistic criterion.
Optimize energy criterion of coherent signal detection system is based on the extreme properties of the characteristic (own) matrices of numbers, and probabilistic criteria - on numerical methods of nonlinear programming.
A two-stage procedure to optimize systems for detection of coherent signals based on the RF-MF combination. In the first stage on the energy or the probability criterion is optimized RF. The second step is optimized MF. In the case of a different weighting in the channels used analytical procedure optimization energy criterion of maximum ratio Rayleigh, which is an approximate version of optimization on probabilistic criterion, and in the case of the same weighting in the channels of the methods of nonlinear programming is the numerical solution of probabilistic criterion. Analysis of processing systems may also be carried out on the energy and probabilistic criterion.
For a small dynamic range for clutter detection systems fixed coherent structure signals a preference should be given to the method of optimization on probabilistic criterion. By increasing the dynamic range of a convergence of parameters and efficiency of systems in comparable cases, that in view of the facilities of the analytical solutions of the optimization problem, as well as more opportunities for implementation of adaptive algorithms indicates the usefulness of the method of optimization on energy criterion.
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Keywords: crest factor reduction, active constellation extension algorithm, adaptive active constellation extension algorithm, tone reservation, peak to average power ratio (PAPR), Orthogonal Frequency-division multiplexing (OFDM).
OFDM (Orthogonal Frequency Division Multiplexing) technique has been widely adopted in many wireless communication systems due to its high data-rate transmission ability and robustness to the multipath fading channel. One major drawback of the OFDM signal is the high peak-to-average power ratio (PAPR) problem. The high PAPR results in the in-band distortion and out-of-band radiation when the OFDM signal is fed into a nonlinear power amplifier (PA). Large fluctuations of OFDM signal amplitude represents a major drawback for amplification in mobile communication systems.
In this paper we analyze the structure of a radio signal with OFDM modulation and conduct a study (research) to reduce the Peak to Average Power Ratio (PAPR) by the use of some of the carrier frequencies (Tone reservation), by extending some modulation constellation points toward the outside and around of the constellation (fixed and adaptive - Active Constellation Extension and Adaptive Active Constellation Extension). As a result of joint research and such methods of processing, PAPR of OFDM signals is reduced significantly (about 5 dB) and the efficiency of using output amplifiers of the transmitting means is improved.
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Keywords: EVM, BPSK, noise immunity, signal constellation, distortion compensation, quadrature receiver, non-reference metric.
The scope of this work is a distortion identification of BPSK signal constellation. The cause of signal distortion can be both multipath signal propagation in dense urban areas and different time constant and phase response of quadrature analog paths with quadrature demodulation. These phenomena lead to a distortion of the signal constellation and decreased immunity of communication system.
An algorithm for the received BPSK signal quality assessing is developed. It allows to distinguish the signal constellation distortion effects and AWGN acting on the signal. Since the power of the received signal does not depend on signal constellation rotation, the distortion identification using the reference metric is difficult. The power control system does not effective in this case. It is necessary to use the non-reference metrics such as EVM. The main feature of the algorithm is the use of a received signal quality mixed metric, which includes the elements of the standard metric (BER) and the non-reference metric (EVM).
The proposed algorithm makes possible to distinguish the effect of AWGN signal constellation and compensate it by analyzing the error vector. Another important feature of this algorithm is its ability to compensate the distortions introduced by the analog RF path that now is an actual task in mind of reducing the quality of the electronic components in the domestic market.
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Keywords: radiometer, passive location, apparatus function, recovery of images, matrix method.
In practice of the radiometric researches there is problem reducing efficiency of use of radiometers in case of supervision over objects.
The problem is connected with a priori unknown apparatus function (AF) of the radiometer. Such function (AF) characterizes influence of the directional pattern of the antenna, path of preprocessing of the radiometer and external factors on the required image of objects. In actual practice operation of the radiometer the value of AF will differ from its value measured in laboratory conditions owing to blurring of the AF form that also reduces efficiency of the radiometer.
The purpose of work is development of algorithms for estimation of the unknown AF in the conditions of aprioristic uncertainty.
The objective is achieved by the solution of the following task: development of new algorithms of AF estimation allowing to increase the accuracy of AF estimates in real practice of supervision due to application of optimum methods of estimation on the basis of radio thermal image standard.
The largest accuracy of estimation of AF was shown by modification of the algorithm based on a matrix method and answering to criterion of an optimality. At the same time application of this algorithm demands knowledge of the standard image that in actual practice it isn't always feasible. Another algorithm in which the initial description of AF is given on the basis of the antenna pattern which characteristic is usually known is represented to more realistic. However automation of selection of the AF parameters in the course of recovery of the image is compli-cated at the small relation a signal-noise and demands participation of the person operator.
The offered algorithms can find application in the existing radiometric systems of microwave range, and also in the optical systems of the Infrared range intended for detection and recognition of objects according to their restored image.
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Keywords: small intestinal electromyogram, migrating myoelectric complex, automated processing signal, moving average, threshold method.
This work is about analysis and automated processing electromyography signals of rats intestinal smooth muscles in chronical experiments. A duration of phase III migrating myoelectric complex (MMC) and a period of cycle MMC were selected as sufficient main time parameters of MMC. Calculations root mean square of moving windows is the main method of the developed algorithm quantitative analysis main parameters of small intestine MMC. The proposed algorithm shows high accuracy (The percentage differences between the calculation and the visual expert analysis of the duration phase III and the period of cycle MMC is 6,5% and 6,7% respectively).
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Keywords: artificial neural network, neurochip, modeling, algorithm, software system, the nervous tissue.
A software system for simulation training neurochips to repair damaged nerve tissue. This software uses an artificial neural network (ANN) in a model of nerve tissue. To simulate the recovery of neural tissue, developed modules to first create the ANN, then damage it, in order to simulate the learning process neurochip for repair of nerve tissue. At the stage of modeling the functioning of the nervous tissue is not damaged software package used for training ANN using algorithms such as backpropagation algorithm, the improved algorithm of back propagation, genetic algorithm, evolutionary algorithm, sorting algorithm weights. To simulate the damage phase ANN designed manual and automated change the weights of ANN. For the simulation phase restoration of damaged nerve tissue, software package allows you to simulate the restoration of the damaged network with a network correction by the latest evolutionary selection. Numerical experiments confirm the possibility of software for creating, damage and restoration of ANN to simulate repair damaged tissue in the nervous microscopic regions of the brain.
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