The article presents a device for narrowband interference compensation on the basis of a bank of digital filters for broadband low-energy HF radio links. An analytical comparison is made of the effectiveness of signal...
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ISBN:
(纸本)9781728106069
The article presents a device for narrowband interference compensation on the basis of a bank of digital filters for broadband low-energy HF radio links. An analytical comparison is made of the effectiveness of signal reception algorithms in the presence of narrowband interference. The algorithm of optimal reception with the normalization of the power spectral density and the algorithm of reception with the rejection of the part of the spectrum affected by interference are compared. An algorithm and a device based on a bank of digital filters are proposed, ensuring the normalization of the power spectral density in accordance with the optimal reception algorithm. The results of the simulation and field experiment on the processing of wideband signals in the presence of interference with the help of the developed program module for the normalization of the spectral power density are presented.
The article discusses the main topics and results of the scientific conference "systems of signals generating and processing in the field of on board communications", in which leading industry experts annual...
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Number of moving objects (satellites, aircrafts, trains, vehicles and so on) rises continuously in the space at earth surface and nearby. This space is filled by radiation and electromagnetic fields of natural and art...
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ISBN:
(纸本)9781538656235;9781538656228
Number of moving objects (satellites, aircrafts, trains, vehicles and so on) rises continuously in the space at earth surface and nearby. This space is filled by radiation and electromagnetic fields of natural and artificial sources. The external electromagnetic fields have an influence upon communication equipment and instruments of moving objects, that can to pose severe hazard to them. The most troubles are brought by lightning discharges, that are source of current, fields, x- and gamma-emission. In this paper there are some aspects of possible impacts considering.
New properties of communication channel with intersymbol interference utilizing by APSK-N-signals are investigated. Based on estimates of the symbol error rate caused by intersymbol interference, the possibility of in...
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ISBN:
(纸本)9781728106069
New properties of communication channel with intersymbol interference utilizing by APSK-N-signals are investigated. Based on estimates of the symbol error rate caused by intersymbol interference, the possibility of increasing the data transmission rate in the channel due to "transparency windows" is estimated. New properties have been identified that allow a significant increase in the efficiency of such communication channels.
Principles of design and structural-schematic schemes of direct digital synthesizers, based on the direct digital frequency and signal synthesis method are presented. The block diagrams of direct digital synthesizers ...
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ISBN:
(纸本)9781728106069
Principles of design and structural-schematic schemes of direct digital synthesizers, based on the direct digital frequency and signal synthesis method are presented. The block diagrams of direct digital synthesizers based on digital code accumulators and with an M-shaped frequency variation law are given. DDS allow synthesizing signals with amplitude, frequency and phase modulation in the frequency range from 0.001 to 400 MHz.
The paper presents the methodological aspects of numerical method for capacity estimating for channels with memory caused by its frequency selectivity, when a multipositional phase shift keyed signal is used as a sign...
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ISBN:
(纸本)9781728106069
The paper presents the methodological aspects of numerical method for capacity estimating for channels with memory caused by its frequency selectivity, when a multipositional phase shift keyed signal is used as a signal. The capacity estimations were made for such communication channels with the most common amplitude-frequency responses. The effects on capacity of such adverse factors as frequency detuning and measurement errors of the phase, as well as the effect of the squelch subsystem presented in the receiver, are estimated.
The paper considers some practical aspects arising from the use of "transparency windows" (range of symbol time durations of information sequence when error probability per symbol due to intersymbol distorti...
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ISBN:
(纸本)9781538656235;9781538656228
The paper considers some practical aspects arising from the use of "transparency windows" (range of symbol time durations of information sequence when error probability per symbol due to intersymbol distortion is zero) to increase spectral efficiency in radio communication systems using multiposition phase-shift keyed signals with n discrete states. The functioning of communication systems was analyzed in the presence of frequency detuning and error produced by phase meter for various amplitude-frequency responses of a linear radio path. The admissible operating conditions and gains in information transfer rate of such systems are determined.
Based on the methods of optical spectroscopy a new principle of generating error signals in systems for multicriteria control is proposed. These systems are intended for control of processes that are accompanied by em...
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Vector is the application programs complex developed by the Moscow Technical University of communications and Informatics (MTUCI). It includes programs of the modulated signals vector synthesis named "Vector-VSG&...
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The importance of challenges has been recognized by certain part of education professionals in Russia in the last 25 years. But only few years ago the structural shaping the management of professionalization for on bo...
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ISBN:
(纸本)9781728106069
The importance of challenges has been recognized by certain part of education professionals in Russia in the last 25 years. But only few years ago the structural shaping the management of professionalization for on boardcommunications in line with the global trends had been commenced. The new social and economic environment demands a drastic change in the teaching process, introducing new standards and approaches for the quality measuring criteria to be introduced to meet the requirements of effective activity and demands of on boardcommunications' employers. This is why the working out and introducing the vocational standards has become the basic instrument to adjust the employers' demands and opportunities of high education Institute (HEI). This mainstream direction of activity is considered to be a priority and basic line for the state program documents defining the guideline policy for science and education development. The concept of modernizing the vocational education should cover mechanisms for the realization of social functions, educational institutions, taking into account the global, federal and regional external trends. In compliance with these priorities we believe it is necessary to focus on the following aspects: (a) factors of social and professional background;(b) system factors;(c) principles of professional education's modernization;(d) methods of professional education's modernization;(e) the potential risks.
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