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The algorithm of processing of signals of relative phase modulation based on summation of absolute values of the sums of instant values of the low-frequency modulating fluctuation with correlation between the next instant values is offered. The analysis of qualitative parameters of the radio engineering system realizing the offered algorithm is made.
This paper gives an overview of P2M protocol - a solution for distribution of massive data sets across multiple destinations in IP network. Paper describes main challenges in designing of high-speed data transport solutions and provides solutions for some of them. P2M was tested in a network of Future Internet Lab Anhalt in order to identify maximal practical limit of data rate per receiver. Tests...
Single-fiber optical transmission system (SFOTS) is offered, where the duplex is organized using dense wavelength division multiplexing (DWDM). The process of generating four-wave mixing products (FWM) occurring in optical fiber is modeled. The distribution of FWM products for the optical spectrum is investigated, as well as the number of products falling within the channel bandwidth.
The interaction of seismic and acoustic wave fields generated by a seismic vibrator in the problem of active seismic monitoring of preparation zones of natural disasters (earthquakes, volcanoes, etc.) is considered. It is shown that a consequence of this interaction are processes of interference of seismic and acoustic signals, which lead to considerable variations in the fields of amplitudes and...
A novel variation of the conventional printed dipole antenna in combination with the modified microstrip via-hole balance unit (balun) is proposed. By properly choosing their parameters, it is possible to create the version of the antenna that has suitable range of input voltage standing-wave ratio (VSWR) performance and radiation patterns. Prototype of this antenna has been successfully implemented...
This paper represents a study of the nonlinear amplitude-phase conversion impact on the M-APSK signal distortion. M-APSK signals are widely used in the satellite communication systems, including broadcasting systems such as DVB-S2. The investigation done in this paper is aimed towards DVB-S2 standardized 16-APSK modulation scheme (4+12 constellation) and focuses on the impact of satellite high power...
In this article we investigated the effect of side-lobe level directivity pattern of digital concentric circular antenna array on frequency-spatial planning mobile satellite systems using the geostationary satellite transponder. The implementation of the optimal frequency-spatial planning was carried out based on the method of coordination rings which allowed electromagnetic compatibility by taking...
In this article the issue of ensuring the electromagnetic compatibility of base stations, the main types of spurious emissions of transmitters of base stations and the ways of their elimination. Base stations with simultaneous operation generate unintentional electromagnetic interference each other, which ultimately reduces the quality indicators of communication and leads to the necessity of solving...
The article describes the method of determining receiving noise immunity for MIMO and MISO technologies. The method is based on the use of matrix eigenvalues of multiple correlation in the case of propagating a multi-path signal.
This article covers some key approaches to solve the problem of reducing inter-cell interference in wireless networks, such as LTE, caused by lack of frequency reuse principle. On the basis of the author's simulation model it was done a comparative analysis of the existing solution in terms of achievable throughput and the probability of blocking the traffic channel PUSCH and PDSCH. The simulation...
The article presents methods of increasing the bandwidth. The attenuator is designed as a matched structures based on the planar film resistors. Achieved a significant expansion of bandwidth at a specified input microwave power due to selecting of each stage of transmission factors, providing the same amount of power dissipation.
The paper deals with an algorithm for detection of a broadband signal received from a multiple-unit source against the background with architecturally-like clutters that differ by location and additive space-uncorrelated noise. It is shown that the optimal detection algorithm represents the weight processing in the «ray space» of the transformed vector of observed data and does not demand access of...
In contemporary software definer radiodevices (SDR), processing of signals is carried out in a digital kind, since entrance cascades of a high-frequency path. The contradiction between very small (by level) analog signals and large value of the least significant bit (LSB) is removed by addition of the vobulation noise. The size and a kind of distribution of this noise essentially influence quality...
The paper is devoted to the analysis of the strain impact on the reliability of optic-fiber communication lines. The reasons of strain appearance in optical fiber are discovered and two models, analytical and simulation, are proposed for the estimation of the integrated reliability indices of fiber-optic lines. The results, obtained by means of the models, can be used for the estimation of recommended...
The methods of obtaining a parameterized density function with a limited number of data. The solution of this problem by minimizing the functional. In the method of the barrier function minimization problem with inequality constraints reduced to solving a sequence of unconstrained minimization problems. The advantage of this approach lies in the number of restrictions is independent of the order of...
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