http://radioelektronika.org/issue/feedRadioelectronics and Communications Systems2018-04-05T20:53:03+03:00Fedor Dubrovkafedor.dubrovka@gmail.comOpen Journal Systems<p>Radioelectronics and Communications Systems, ISSN 1934-8061 (Online), ISSN 0735-2727 (Print) is a monthly peer-reviewed international scientific journal on electrical engineering, electronic engineering, and electronics. It is English version of the journal <strong>Izvestiya Vysshikh Uchebnykh Zavedenii. Radioelektronika</strong>, ISSN 2307-6011 (Online), ISSN 0021-3470 (Print). The journal is indexed in SCOPUS, INSPEC, Google Scholar, Academic OneFile, EI-Compendex, Gale, OCLC, SCImago, Summon by Serial Solutions, VINITI, RSCI. <strong>Сites per Doc. = 0.3</strong> (Cites per Doc. (2y) = Impact Factor WoS, 2016). <strong>SJR = 0.2, Q3, SNIP = 0.46</strong> (Scopus, 2016).</p>radiocurrenthttps://feedburner.google.comhttp://radioelektronika.org/article/view/S073527271992110013Principles of creating a signal processing language2018-04-05T19:19:29+03:00V. E. Bocharovinfo@radio.kpi.uaV. G. Galaganinfo@radio.kpi.ua<span lang="EN-US">The basic principles of construction, set of operators, semantics and syntax of a algorithmic digital signal processing language are presented. The effectiveness of constructing the language on the basis of concepts of a discrete signal as an unlimited sequence of samples, concepts of time scales, current time, etc., is substantiated.</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/stHJn9hOtD8" height="1" width="1" alt=""/>1992-11-01T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110013http://radioelektronika.org/article/view/S073527271992110025Combined filtering and recognition of the type of segment of excitation of noisy speech signals2018-04-05T19:19:31+03:00V. I. Gupalinfo@radio.kpi.uaS. Ya. Zhukinfo@radio.kpi.uaYu. A. Mamonovinfo@radio.kpi.ua<span lang="EN-US">Algorithms for filtering and recognition of the type of segment of excitation of noisy speech signals were synthesized on the basis of the apparatus of mixed Markov processes in discrete time. The algorithms obtained are analyzed for the example of processing a real speech signal on a computer.</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/ddZvXKgnDuM" height="1" width="1" alt=""/>1992-11-02T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110025http://radioelektronika.org/article/view/S073527271992110037Analysis of energy characteristics of a cascade connection of dissipative microwave quadripoles2018-04-05T19:19:35+03:00V. V. Zagoruikoinfo@radio.kpi.uaV. P. Kovalinfo@radio.kpi.uaV. P. Narbutinfo@radio.kpi.uaA. I. Yushininfo@radio.kpi.ua<span lang="EN-US">A method of detennining the absorbed power in a cascade connection of dissipative quadripoles is described, expressions enabling calculation of the absorbed power in the <em>i</em>th quadripole are given. The distribution of power in multicascade pin attenuators was analyzed. The factors affecting an increase of the maximum level of the operating power were determined.</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/X6InsiyCUVM" height="1" width="1" alt=""/>1992-11-03T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110037http://radioelektronika.org/article/view/S073527271992110049Analysis of circuits with switched capacitors by means of signal-flow graphs2018-04-05T20:36:16+03:00T. Dostalinfo@radio.kpi.uaJ. Mikulainfo@radio.kpi.ua<span lang="EN-US">A method of constructing signal-flow graphs of circuits having an arbitrary configuration with switched capacitors is examined. The signal-flow graph is constructed by means of a transformation graph of subgraphs of individual switched capacitors. The transformation graphs take into account also the effect of nonstandard active components of the circuit and switches.</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/oTagYfjL3TI" height="1" width="1" alt=""/>1992-11-04T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110049http://radioelektronika.org/article/view/S073527271992110050Qualitative indices of broadcast transmitters in a single-sideband mode2018-04-05T19:19:50+03:00D. A. Tkachenkoinfo@radio.kpi.ua<span lang="EN-US">It is suggested to characterize the quality of a signal at the output of high-frequency broadcast transmitters in a single-sideband mode with an attenuated carrier R3E by the same indices as are used in the usual amplitude modulation mode A3E. The indicated indices are calculated for a radio transmitter with separate amplification of the components of a single-sideband signal with consideration of the characteristics of the output filter of the switch anode modulator. The requirements imposed on the filter are formulated.</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/55EqekEpM8Y" height="1" width="1" alt=""/>1992-11-05T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110050http://radioelektronika.org/article/view/S073527271992110062Probabilistic properties of dynamic modulation characteristics of quartz oscillators2018-04-05T19:19:58+03:00V. N. Roman’koinfo@radio.kpi.uaYu. S. Shmaliiinfo@radio.kpi.ua<span lang="EN-US">A probabilistic analysis of the dynamic modulation characteristics (DMCs) of quartz self-excited oscillators (QSOs) in the vicinity of anharmonic resonances of a resonator is made. It is shown that the probability density functions of the phase and frequency DMCs obey the generalized Rice law. The expected values and variances of the DMCs were investigated in a fluctuating field of parameters of signals of a generalized scheme of QSOs. Results enabling making a conclusion about the necessary level of the amplitude of the modulating signal for which the DMCs acquire stabilizing properties providing minimum instability of the frequency of the output oscillations of the reference QSOs using the modulation method of frequency stabilization are obtained.</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/sVae7AtYtJk" height="1" width="1" alt=""/>1992-11-06T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110062http://radioelektronika.org/article/view/S073527271992110074Precision method of determining the time delay in multichannel signal propagation2018-04-05T19:20:05+03:00D. B. Aratskiiinfo@radio.kpi.uaO. A. Morozovinfo@radio.kpi.uaE. A. Soldatovinfo@radio.kpi.uaV. R. Fidel’maninfo@radio.kpi.ua<span lang="EN-US">One of the important problems arising when processing signals propagating over several channels with various noise characteristics is a determination of their time delay [1]. In the case of two channels formulation of the problem reduces to the following form: We have two signals <em>s</em><sub>1</sub> and <em>s</em><sub>2</sub>…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/SwxriW9XVR4" height="1" width="1" alt=""/>1992-11-07T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110074http://radioelektronika.org/article/view/S073527271992110086Method of analyzing the passage of pulses through films with nonlinear parameters in waveguide structures2018-04-05T19:20:09+03:00A. G. Glushchenkoinfo@radio.kpi.ua<span lang="EN-US">Passage of electromagnetic waves through interfaces has been studied well in a linear approximation. At the same time, nonlinear properties of materials, which are finding ever greater use in superhigh- and extremely- high-frequency equipment, must be taken into account already at power levels usual for communication and information processing systems. Owing to the difficulty of analysis, reflection from interfaces with nonlinear media was examined mainly when analyzing the generation of harmonics and frequency interactions of monochromatic signals. In the present work a method of calculating the parameters of pulses during their passage through the interface of media in free space or in a waveguide with a nonlinear film oriented perpendicular to it axis is examined. It was established that in the case of interactions in the form of step functions, an approximate analytic solution of integrodifferential nonlinear equations describing passage of pulses through a film with nonlinear parameters is possible…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/hXqCrwtnB7M" height="1" width="1" alt=""/>1992-11-08T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110086http://radioelektronika.org/article/view/S073527271992110098Anomalous dispersion in the region of self-absorption of electron-hole plasma of a heterostructure laser2018-04-05T19:20:16+03:00V. A. Aksyutenkovinfo@radio.kpi.uaE. N. Khabarovinfo@radio.kpi.ua<span lang="EN-US">The Cauchy extrapolation of the dispersion coefficient of electron-hole plasma to the region of self-absorption frequencies used by certain authors is not well-grounded. From experimental measurements of the emission spectrum of stripe-geometry heterostructure lasers based both on a GaInPAs solid solution and on a GaAs compound, the authors established an anomalous dependence of dispersion, which corresponds to fundamental notions about the exciton nature of this phenomenon occurring precisely in the frequency region of the self-absorption band [1]…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/Lkg3UdC09iQ" height="1" width="1" alt=""/>1992-11-09T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110098http://radioelektronika.org/article/view/S073527271992110104Method of calculating the characteristics of detecting a burst of coherent pulses against the background of Gaussian impulse noise2018-04-05T19:20:22+03:00S. V. Yagol’nikovinfo@radio.kpi.uaV. I. Shevchukinfo@radio.kpi.ua<span lang="EN-US">Works are known, for example, [1, 2], which give expressions for calculating the qualitative indices (characteristics) of detecting a burst of coherent signals against the background of stationary Gaussian noise. However, in practice it is often necessary to deal with a situation when noise is a random pulse flow of Gaussian noise pulses [4–6]. There are no methods of calculating the characteristics of detecting signals for these conditions, which determines the urgency of their development…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/P8FyZjkuMJ8" height="1" width="1" alt=""/>1992-11-10T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110104http://radioelektronika.org/article/view/S073527271992110116Stability of the rate of scanning a laminated optical deflector2018-04-05T19:20:28+03:00D. N. Kosolapinfo@radio.kpi.uaP. F. Sukhodoevinfo@radio.kpi.uaM. V. Srybnikinfo@radio.kpi.uaV. A. Miroshnichenkoinfo@radio.kpi.ua<span lang="EN-US">Laminated optical deflectors, being rather simple and effective devices, are used for deflecting the beam in laser radiators. One the designs of a laminated optical deflector is shown in Fig. 1 [1]. It consists of a base <em>4</em>, two active sheets <em>2</em> fastened in cantilever fashion in it with a reflector <em>1</em> on the free end, which are placed in a field winding <em>3</em>. The active sheets are made of piezoelectric ceramic or magnetostriction alloys with a different sign of elongation. With placement of such sheets joined by their planes in the appropriate field of an alternating quantity, one of them periodically shortens and the other lengthens, which leads to bending of the sheets and to reciprocal motion of the reflector <em>1</em>…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/NLVsiH656Xo" height="1" width="1" alt=""/>1992-11-11T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110116http://radioelektronika.org/article/view/S073527271992110128Tomographic methods of controlling reflections from local objects2018-04-05T19:20:36+03:00V. I. Samoilenkoinfo@radio.kpi.ua<span lang="EN-US">The use of prior information about the shape of the radiation pattern (RP) makes it possible to determine the spatial distribution of the effective surfaces of repeated reflection of local objects invariant to a change in the parameters of the RP. The use of a novelty filter (instead of subtraction) for compensating reflections from local objects eliminates the effect of the radar receiving-amplifying channel on compensation of the parameters. The simplest method of compensating reflections from local objects is storing video signals for each orientation of the RP in a mapping mode and subtracting this signal in the on-line taiget detection and tracking mode. Such an approach would be sufficiently effective if the shape of the RP, parameters of the receiving and transmitting channels of the radar, and also the media of propagation in the mapping and on-line modes remained unchanged. Unfortunately, it is not possible to achieve this, and not only for technological reasons. Modem radars, e.g., the "Patriot,” use a set of phased arrays for forming the RP, making it possible by adaptive methods to change the shape of the RP for controlling noise. This means that the shapes of the RP in the mapping and on-line modes as well as the video signals reflected from local objects will be different and their subtraction will not produce the expected compensation results…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/KhFQ5x-4ELw" height="1" width="1" alt=""/>1992-11-12T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110128http://radioelektronika.org/article/view/S07352727199211013XEffective algorithm for statistical digital filtering2018-04-05T19:20:43+03:00A. N. Detkovinfo@radio.kpi.ua<span lang="EN-US">A rigorous mathematical solution of the problem of statistical synthesis of recursive digital filters based on R. L. Stratonovich’s theory of conditional Markov processes was given in [1]. However, the distortions specific for microprocessors due to rounding of numbers and limitation of the word length, which lead to substantial estimation errors, were not taken into account here. These errors are caused by loss of positive definiteness and ill condition of the correlation matrices. To overcome the indicated difficulties, the method of taking the square roots of matrices is used successfully in Kalman filters [2]. Algorithms for digital filtering resistant to computational errors related to limitation of the word length of microprocessors on which the digital filter is realized are obtained in the work by means of the given method…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/I72baoRUopM" height="1" width="1" alt=""/>1992-11-13T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S07352727199211013Xhttp://radioelektronika.org/article/view/S073527271992110141Method of synthesizing a linear system2018-04-05T19:20:48+03:00Z. D. Lernerinfo@radio.kpi.ua<span lang="EN-US">The method of synthesizing linear systems in the form of closed or open structures with integrators is used widely [1]. In the first case the transfer function, which in the general case is time-dependent, has the form (1)…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/_72DubENRuU" height="1" width="1" alt=""/>1992-11-14T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110141http://radioelektronika.org/article/view/S073527271992110153System of two-dimensional binary signals with ideal periodic correlation functions2018-04-05T19:28:39+03:00I. P. Bukanovinfo@radio.kpi.ua<span lang="EN-US">The known strictly optimal ensembles of one-dimensional binary sequences (Gold’s, Kasami’s, sequences of bent functions) have an upper limit of the level of the periodic cross-correlation function (PCCF) considerably exceeding the zero value [1]. Therefore, of definite interest is a search for families of signals in other classes, in particular, in the case of two-dimensional binary signals, which can produce an improvement, other conditions being equal, of the upper level of the PCCF. A number of works [2–4] devoted to two-dimensional binary sequences have recently been published. However, it is necessary to note that the mathematical theory of the synthesis of such signals and systems is in the initial stage of development. A system of two-dimensional binary signals with single-level, equal to unity, PCCFs intended for use in parallel communication channels with multiple access was examined in [5]. A system with ideal, equal to zero, PCCFs is studied in the present report…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/o3hFrpv7Jt4" height="1" width="1" alt=""/>1992-11-15T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110153http://radioelektronika.org/article/view/S073527271992110165Connection of a coaxial transmission line to a partially filled rectangular waveguide2018-04-05T20:51:13+03:00V. N. Pochernyaevinfo@radio.kpi.ua<span lang="EN-US">Coaxial–waveguide junctions are used widely in microwave receiving and transmitting channels of communication equipment. Designing of microwave channels on rectangular waveguides partially filled with a dielectric has a number of advantages, the main ones of which are the possibility of increasing the dielectric strength and reducing the dimensions. Such junctions occurs also in that case. The connection of a coaxial transmission line to a partially filled rectangular waveguide (PFRW) is called a CPFRW junction. The purpose of the work was to investigate the input impedance of such a junction, when only dominant types of waves propagate in both transmission lines…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/59bfCFo98D8" height="1" width="1" alt=""/>1992-11-16T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110165http://radioelektronika.org/article/view/S073527271992110177Resistance of a film resistor with a slit of finite width2018-04-05T20:53:03+03:00V. D. Sadkovinfo@radio.kpi.uaD. E. Orlovinfo@radio.kpi.ua<span lang="EN-US">Film resistors with an infinitesimally thin correcting slit were calculated in [1, 2]. We will take into account the finite width of a slit (Fig. 1) by the method of conformal mapping [3]. It is more convenient to solve the problem with inversion of the boundary conditions - transfer of contacts from sections M<sub>1</sub>N<sub>1</sub> and M<sub>6</sub>N<sub>5</sub> of the film to sections M<sub>1</sub>M<sub>2</sub>M<sub>3</sub>-M<sub>4</sub>M<sub>5</sub>M<sub>6</sub> and N<sub>1</sub>N<sub>5</sub> (the resistance of the investigated R<sub>invs</sub> and inverted R<sub>invr</sub> resistors are associated by the relation: sqrt(R<sub>invs</sub>R<sub>invr</sub>) = [rho], where [rho] is the resistivity of the resistive film…</span><img src="http://feeds.feedburner.com/~r/radiocurrent/~4/WwnXva71tKA" height="1" width="1" alt=""/>1992-11-17T00:00:00+02:00Copyright (c) 2018 Radioelectronics and Communications Systemshttp://radioelektronika.org/article/view/S073527271992110177