RADIOELECTRONICS AND COMMUNICATIONS SYSTEMS

Efficiency of Ultra-Wideband Quasi-Radio Signal’s Frequency Estimation

A. P. Trifonov and P. Ye. Rudnev

Radioelectron. Commun. Syst. — 2011. — Vol. 54, No. 6. — P. 285–293.

DOI: 10.3103/S073527271106001X

Synthesis and analysis of maximum likelihood algorithms for estimating frequency of ultra-wideband quasi-radio signal with unknown parameters and duration of several periods or a fraction of period of harmonic oscillation are conducted. Dispersions of the synthesized estimates are obtained

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Statistical Analysis of Jitter Estimation in ADC

M. Bondarenko

Radioelectron. Commun. Syst. — 2011. — Vol. 54, No. 6. — P. 294–304.

DOI: 10.3103/S0735272711060021

Analytical expressions for jitter estimation under conditions of sinusoidal signal at ADC input are obtained for the case of no prior knowledge of jitter value. Statistical analysis of the obtained estimates is conducted. Numerical modeling results are presented. Applicability limits for the suggested estimates are obtained

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Noise Immunity of the Reception of Wide-Band Signals with Polarization Coding under Exposure to Partially Polarized Gaussian Interference

V. D. Lukyanchikov and V. V. Liventsev

Radioelectron. Commun. Syst. — 2011. — Vol. 54, No. 6. — P. 305–314.

DOI: 10.3103/S0735272711060033

Analytical expressions of the average bit error probability for the coherent matched reception of binary phase-manipulated wide-band signals with orthogonally linear polarization coding and additional inverse polarization manipulation against the background of partially polarized Gaussian interference have been obtained. The derived theoretical relationships were corroborated by the results of statistical computer simulation

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Blind Signals Separation with Genetic Algorithm and Particle Swarm Optimization Based on Mutual Information

S. Mavaddaty and A. Ebrahimzadeh

Radioelectron. Commun. Syst. — 2011. — Vol. 54, No. 6. — P. 315–324.

DOI: 10.3103/S0735272711060045

Blind source separation technique separates mixed signals blindly without any information on the mixing system. In this paper, we have used two evolutionary algorithms, genetic algorithm and particle swarm optimization for blind source separation. In these techniques a novel fitness function that is based on the mutual information and high order statistics is proposed. In order to evaluate and compare the performance of these methods, we have focused on separation of noisy and noiseless sources. Simulations results demonstrate that the proposed method for employing fitness function has rapid convergence, simplicity and a more favorable signal to noise ratio for separation tasks based on particle swarm optimization and continuous genetic algorithm than binary genetic algorithm. Also, particle swarm optimization enjoys shorter computation time than the other two algorithms for solving these optimization problems for multiple sources

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The Electrodynamic Calculation of an Infinite Waveguide PAA with Matching Periodic Structure

S. V. Marchenko and V. M. Morozov

Radioelectron. Commun. Syst. — 2011. — Vol. 54, No. 6. — P. 325–330.

DOI: 10.3103/S0735272711060057

A three-dimensional problem dealing with the radiation of electromagnetic wave from the plane infinite PAA consisting of the main array and the subarray spaced certain distance apart and having the same geometry of the cross-section has been solved. The impact of geometrical dimensions (subarray length and its distance from the main array) on the PAA matching with free space was investigated in the frequency range and angle range of scanning. The investigation of frequency properties of PAA with matching structure was performed for the triangular and rectangular grids of radiator arrangement

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Natural and Mutual Conductances of Ring Groove in a Finite Cone

D. B. Kuryliak and O. B. Trishchuk

Radioelectron. Commun. Syst. — 2011. — Vol. 54, No. 6. — P. 331–336.

DOI: 10.3103/S0735272711060069

There are researched dependences of real and imaging parts of natural and mutual conductance of ring grooves on their position of finite and semi-infinite ideally conductive cones. It is shown that influence of cone edge on these dependences can be essential and it must be taken into account during calculation of scattering properties of finite conic structures with ring grooves

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The General Form of Secondary Parameters of Uniform Line under Expofunctional Actions

A. M. Ivanitckiy and M. V. Rozhnovskiy

Radioelectron. Commun. Syst. — 2011. — Vol. 54, No. 6. — P. 337–342.

DOI: 10.3103/S0735272711060070

The paper presents formulas for secondary parameters of a uniform line under expofunctional actions. The formula has been found for calculating the value of the exponential action parameter required for simplifying the analysis of the mathematical model of uniform line under the specified actions

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Erratum: “Methods of Improving Information Security by Integrating Multiplexing, Ciphering and Channel Encoding Operations” [Radioelectronics and Communications Systems 54(5), 227 (2011)]

M. I. Mazurkov, V. Ya. Chechelnytskyi, A. N. Meleshkevich, S. N. Kropachev, and N. I. Kushnirenko

Radioelectron. Commun. Syst. — 2011. — Vol. 54, No. 6. — P. 343.

DOI: 10.3103/S0735272711060082

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Abstracts No. 5, 2011, Vol. 54, 227-283 →