Search

The error origins in determining of reception time of radio probing signal are considered in this article. Also the method of error probability calculation was offered in this work. The analysis of maximum probability of such error was carried out for phase-shift keyed signal on the base of Barker’s code and radio signal ...

The study of signals with quadrature-amplitude modulation is an urgent task due to their wide application in the satellite television broadcasting systems, as well as for the communication channel of the INMARSAT satellite communication system and the Sirius satellite....

The work of analog-to-digital converter and the problems arising in the reduction of the input signal are investigated. A solution to the problem of aperture uncertainty is presented by using a constructive method with an approximate analysis of the reconstructed signal. 1. Балакай В. Г., Крюк И. П., Лукьянов Л. М. ...

In the work the mechanism of compound harmonic signal and noise through the bistable system which role carries out Schmitt's trigger is considered. Dependence of signal-to-noise ratio on different factors is shows. Necessary conditions for ensuring increase of the signal-to-noise ratio at the output ...

The algorithm of definition of the attitude a signal/noise for a mix of a signal and narrow-band noise is offered at various noise levels that can be used at various ways of processing of signals. 1. Баскаков C. И. Радиотехнические цепи и сигналы. М., 2009. ...

The algorithm of the solution of the task of permission of signals in communication systems with not orthogonal carrier frequencies is provided. A basis are provisions of the theory of optimum reception in the annex to communication systems. It is shown that the system of equations of credibility allows to solve ...

Calculation of level of losses of a radio signal of cellular communication in the conditions of a city with dense many-storeyed building on the basis of statistical models is resulted. On the basis of statistical look-ahead estimations of loss of capacity of a signal on an input of user's stations ...

The results of generalized satellite channel model constructing in MathCAD, including the synthesis of a discrete information signal, the im­plementation of a convolutional encoder, a forming Nyquist filter and a BPSK modulator, the synthesis of a discrete additive narrow-band Gaussian noise, the implementation of a BPSK demodulator and a decoder based on the Wit­terby algorithm ...

The article proposes ways and principles of creating automated training systems using the example of a training program for studying a radio moni­toring and signal analysis complex (Kassandra class) for training information security specialists, which can be used by educational organizations and training centers conducting training in this area. Sayapina M. E. training system, radio monitoring, signal ...

In the real work the solution of a problem of determination of parameters of the radio impulse reflected from an ionosphere is considered. The noise component, and also the multibeam structure of a signal arising at formation two magnetoionic component is thus considered. Expression for definition of probability of reception of a radio impulse in these conditions is received. 1. Перов А. И. Статистическая теория радиотехнических ...

On the basis of a method of the maximal credibility considers questions limiting accuracy parameters of a signal and the sanction on range at approach of the purpose a locator. It is shown, that due to increase of the attitude the signal/noise essentially increases an opportunity of the sanction of the radio impulses reflected from the purpose. The supersanction ...

... paper describes an algorithm for integrating digital measuring devic­es with a personal computer as part of a multifunctional instrument complex for using the resources of the Matlab application software package for record­ing and processing received signals. The basic device is a memory oscilloscope manufactured by «Tektronix», which has proven itself in laboratory experi­ments on radio spectroscopy. The proposed procedure for connecting the oscil­loscope to the software package is a sequence ...

The paper presents the results of a study in which laboratory facilities were assembled to measure the probability of receiving erroneous bits for BPSK, QPSK, 8PSK, DBPSK, QAM-4,8,16,64 radio signals for various SNRs in the MATLAB + Simulink simulation environment. The research results and the developed virtual laboratory setup have found application in a comparative assessment of the noise immunity of a ra­dio channel using standard and ...

... multi-channel duplex radio communication systems that en­sure reliable operation on a surface vessel. The research provides analytical expressions for the calculation of the possible number of transmit-receive channels in the model, depending on the signal spectrum width in the chan­nel. The proposed software allows you to quickly calculate the parameters of the communication system. 1. Катанович А. А. Комплексы и системы связи надводных кораблей....

This article presents signal processing through linear frequency modula-tion (chirp signals) using the maximum likelihood method. The authors have obtained main expressions describing the optimal algorithm for processing these signals, as well as expressions for chirp signal ...

A method of filtering radar pulse on the background of the focus obtained by frequency interference. The basis of the method are the principles of the theory of optimal reception and position of the linear space of signals. Derived the basic expressions when filtering of the signal strength in the area of orthogonality of signal and noise, and their non-orthogonality. Equations for impulse and hour-tonyh characteristics of filters. 1. Баскаков С. И. Радиотехнические ...

In this work some conditions allows to increase of the indirect nuclear quadrupole resonance are investigated. The proposed method based on the stochastic resonance phenomena in the input electronic circuits of spectrometer. This effect allows provide the essential raise of the signal-to-noise ratio. 1. Гречишкин В.   С., Гречишкина Р.   В., Шпилевой А.   А., Персичкин А.   А., Хун Хео // Оптика и спектроскопия. 2003. Т . 94, №   3. 2. Neiman A., Shimansk-Geier L., Moss F. // Phys. Rev. 1997...

The purpose of the work to make clear the influence emitter bipolar transistor spurious inductance on tuning frequency range, signal amplitude and noise-signal ratio of oscillator. 1.  Савченко М.   П. Флуктуации в перестраиваемых варикапами высоко­час­тотных транзисторных автогенераторах: ...