scholarly journals Method of the adaptive decoding of self-orthogonal codes in telecommunication

2020 ◽  
Vol 19 (3) ◽  
pp. 1287
Author(s):  
Juliy Boiko ◽  
Ilya Pyatin ◽  
Oleksander Eromenko ◽  
Mykhailo Stepanov
Keyword(s):  
Information Transfer ◽  
Noise Immunity ◽  
Convolutional Codes ◽  
Theory And Practice ◽  
System Capacity ◽  
Orthogonal Codes ◽  
Adaptive Filtration ◽  
Code Constructions ◽  
Adaptive Decoding ◽  
Practical Recommendations

<p>The methodology description of the adaptive multi-threshold decoding of self-orthogonal codes in the telecommunication channels of information transfer is shown in this paper. The method of multi-threshold decoder modification is described on the basis of adaptive filtration algorithms. Principles of adaptive algorithms application provide for necessary data transmission validity in the case of the multi-threshold decoding are explored. The graphic charts of multi-threshold decoders noise immunity of self-orthogonal block and convolutional codes are presented. It is determined the coding gain (CG) for multi-threshold decoding schemes. The result of research conducted in the course of the paper is to develop a set of scientifically grounded theoretical positions and practical recommendations and proposals for the development of mechanisms of formalization of description of method of increasing of noise immunity of telecommunication systems transmitting information to the synthesis and improving receiver circuit modulated signals on the theory and practice the use of signal-code constructions (SCC) when deciding maximize system capacity information transmission in the presence of noise.</p>

scholarly journals Formalization of Methods in Criminalistics

2019 ◽  
Vol 75 (4) ◽  
pp. 86-90
Author(s):  
L. P. Grynko
Keyword(s):  
Forensic Science ◽  
Theory And Practice ◽  
Independent Research ◽  
Theoretical Level ◽  
Mathematical Methods ◽  
Material Models ◽  
Theoretical Methods ◽  
Judicial Practice ◽  
Sign System ◽  
Practical Recommendations

Scientific works on formalization of methods in criminalistics have been analyzed in the article. Despite the importance and relevance of these issues, it has been established that there is a number of unresolved issues in the theory of forensic science, as well as in investigative and judicial practice regarding the possibilities of formalizing methods and their implementation, which require separate independent research and in-depth reflection. Accordingly, the purpose of this article is to clarify the methods used to detect and investigate crimes and the possibilities of their formalization in criminalistics. Formalization methods in criminalistics have been considered. It has been found out that the most successful is their division into formalization of theoretical methods and formalization of practical methods. Methods of theoretical level have been researched. It has been emphasized that the use of mathematical methods contributes to the development of the most accurate practical recommendations, which allow to approach many issues of the theory and practice of forensic science from new positions. The author has considered the modeling method and has argued that it creates the preconditions for the use of formalization, since acting as prototypes, plans, hypothetical constructions of all kinds, this process is presented to investigators as a complex of interrelated transformations in the form of description. The development and use of forensic material models in the management of an investigative situation allows investigators to use, by analogy, forensic algorithms and investigative programs. Thus, the formalization is carried out in the form of the transition of content into a sign system. It is designed to address the tasks faced by investigators and directly related to the investigative situation existing at the time of the investigation. It has been found out that the formalization of forensic knowledge methods allows the use of such knowledge in the process of solving problems and making decisions by means of signs and symbols, which may increase the capacity of investigators to solve problems at all stages of crime investigation in different conditions of uncertainty.

Knowledge Management Trends

2011 ◽  
pp. 3475-3483 ◽  
Author(s):  
Lisa A. Petrides ◽  
Lilly Ngyuen
Keyword(s):  
Higher Education ◽  
Knowledge Management ◽  
Information Transfer ◽  
Higher Education Institutions ◽  
Theory And Practice ◽  
Educational Institutions ◽  
Business Sector ◽  
The Impact ◽  
Systemwide Change

While the pressure of public accountability has placed increasing pressure on higher education institutions to provide information regarding critical outcomes, this chapter describes how knowledge management (KM) can be used by educational institutions to gain a more comprehensive, integrative, and reflexive understanding of the impact of information on their organizations. The practice of KM, initially derived from theory and practice in the business sector, has typically been used to address isolated data and information transfer, rather than actual systemwide change. However, higher education institutions should not simply appropriate KM strategies and practices as they have appeared in the business sector. Instead, higher education institutions should use KM to focus on long-term, organization-wide strategies.

scholarly journals Exchange Rate Policy and Export Promotion: Evidence from Uzbekistan

2020 ◽  
Vol 5 (5) ◽  
Author(s):  
Elmurod Abdusattorovich Hoshimov
Keyword(s):  
Exchange Rate ◽  
Export Performance ◽  
Export Promotion ◽  
Exchange Rate Policy ◽  
Theory And Practice ◽  
Rate Policy ◽  
The Republic ◽  
The Impact ◽  
Practical Recommendations

This article is devoted to the analysis of the impact of exchange rate policy on export performance in terms of theory and practice. In addition, the article presents developed scientific proposals and practical recommendations aimed at enhancing the promoting role of exchange rate policy in improving export performance of the Republic of Uzbekistan.

scholarly journals THE FOUNDER OF THE DECAMETER RADIO ASTRONOMY IN UKRAINE ACADEMICIAN OF NAS OF UKRAINE SEMEN YAKOVYCH BRAUDE IS 110 YEARS OLD: HISTORY OF CREATION AND DEVELOPMENT OF THE NATIONAL EXPERIMENTAL BASE FOR THE LAST HALF CENTURY

2021 ◽  
Vol 26 (1) ◽  
pp. 5-73
Author(s):  
O. O. Konovalenko ◽  
◽  
V. V. Zakharenko ◽  
L. M. Lytvynenko ◽  
O. M. Ulyanov ◽  
...  
Keyword(s):  
Radio Astronomy ◽  
Noise Immunity ◽  
Phase Shifter ◽  
Low Frequency ◽  
Systems Design ◽  
Historical Review ◽  
Theory And Practice ◽  
Radio Telescopes ◽  
Experimental Base ◽  
Decameter Radio

Purpose: A historical review of the experimental baselopment of low-frequency radio astronomy in Ukraine, its foundation half a century ago by an outstanding scientist S.Ya. Braude to the current state. Design/methodology/approach: The constant progress of electronic, computer and digital technologies, information and telecommunication technologies, theory and practice of antenna and receiving systems design, which introduction enriched the hardware and methodological ideology of construction and usage of the UTR-2, URAN, and GURT radio telescopes, have been used. Findings: The worldwide most effective national experimental radio astronomy means, the UTR-2, URAN, and GURT decameter-meter wave radiotelescopes, have been created and improved. The best combination of the systems main parameters: sensitivity; frequency band; spatial, frequency and temporal resolutions; noise immunity; uniformity of amplitude-frequency and space-frequency characteristics and multifunctionality has been provided. Conclusions: For the half a century of radio astronomical scientific and technical at the Institute of Radio Astronomy of NAS of Ukraine, the high astrophysical informativeness of the low-frequency radio astronomy and the possibility of creating a highly efficient experimental base – giant radio telescopes of decameter-meter wavebands have been proved. Today, the Ukrainian radio telescopes are well known and recognized world-wide being indispensable and most in demand by the scientific community. The founder of the decameter radio astronomy in Ukraine, the eminent scientist Semen Yakovych Braude was not mistaken when he decided to start radio astronomical explorations. The memory of him will always remain in the minds and hearts of many generations. Key words: low-frequency radio astronomy; radio telescope; phase shifter; antenna amplifier; digital signal recorder; effective area; sensitivity; resolution; noise immunity

scholarly journals Improving Noise Immunity And Efficiency Using High-precision Iterative Codes

2020 ◽  
pp. 1-8
Keyword(s):  
High Precision ◽  
Information Transfer ◽  
Noise Immunity ◽  
Gray Code ◽  
Digital Information ◽  
Coding System ◽  
Decoding Algorithm ◽  
Probability Of Error ◽  
Digital Broadcasting ◽  
Iterative Coding

The article discusses the issues of ensuring noise immunity in digital broadcasting systems, shows the importance of the transition to the optimal code and the need to use it in the field of noiseless coding in various areas of telecommunication transmission and reception of digital signals. The previous algorithms and error-correcting coding methods based on the Gray code, which are used in multi-level digital broadcast modulation schemes to minimize the intensity of bit errors, are highlighted. A model of error-correcting coding by the Gray method and methods for estimating the probability of error for the Gray code are presented. Based on computer modeling in the Matlab 7.0 Simulink environment, a model of a noise-resistant coding system was developed, which works on the basis of a parallel-cascade high-precision iterative coding and decoding algorithm, a method for determining and estimating the probability of error is given for the high-precision iterative coding and decoding algorithm, and the complexity of constructing a high-precision iterative code. The study obtained probabilistic-energy characteristics for the Gray code and for a high-precision iterative code in various positions of phase manipulation. A comparative analysis of the energy gain G (dB) of the high-precision iterative coding algorithm with the Gray coding algorithm is performed. The simulation results in a Simulink environment of an error-correcting Gray code and a high-precision iterative code in a digital information transfer system are presented

Modeling of Aircraft and RPAS Data Transmission via Satellites

2021 ◽  
pp. 187-236
Author(s):  
Andrii Mikhailovich Grekhov
Keyword(s):  
Error Detection ◽  
Data Transmission ◽  
Information Transfer ◽  
Satellite Communication ◽  
Path Loss ◽  
Convolutional Codes ◽  
High Power Amplifier ◽  
Modulation Type ◽  
Amplifier Gain ◽  
Downlink Channels

This chapter is devoted to the modeling of aircraft data transmission via low-orbit satellites. Satellite communication channel models were designed, which allow to investigate BER dependencies on the type of signal modulation, information transfer rate, signal power, antenna diameters, and nonlinearity of a high power amplifier. Impact of a modulation type (BPSK, QPSK, 8PSK, 16QAM), Eb / N0, satellite transponder amplifier gain without and with coding on a BER was investigated. Effectiveness of error detection and correction was analyzed using classic linear block and convolutional codes. Free space path loss, AWGN, and radio frequency satellite channels were considered. MIMO 2 × 1 and 3 × 2 fading uplink/downlink channels with antenna diversity were analyzed. Results were compared with AWGN uplink/downlink channels. On the base of these models, channels integrity was investigated.

NEW CONCATENATION SCHEMES BASED ON THE MULTITHRESHOLD DECODERS OF CONVOLUTIONAL SELF-ORTHOGONAL CODES FOR GAUSSIAN CHANNELS

2021 ◽  
Vol 9 (4) ◽  
pp. 51-62
Author(s):  
Dina Satybaldina ◽  
◽  
Valery Zolotarev ◽  
Gennady Ovechkin ◽  
Zhuldyz Sailau kyzy ◽  
...  
Keyword(s):  
Viterbi Algorithm ◽  
Convolutional Codes ◽  
Performance Characteristics ◽  
Moderate Increase ◽  
Two Dimensional ◽  
Reed Solomon Codes ◽  
Gaussian Channels ◽  
Orthogonal Codes ◽  
Simulation Results ◽  
Decoding Delay

New serial concatenation schemes based on the multithreshold decoders and di- vergent principle for the convolutional self-orthogonal codes under Gaussian channels are proposed. Using both binary and symbolic decoders on the second decoding stage of the convolutional codes are considered. Simulation results are indicated the higher performance characteristics of the proposed cascade schemes on majority decoders in comparison with clas- sical schemes based on the Viterbi algorithm and Reed-Solomon codes. A moderate increase in decoding delay during concatenation is revealed. It is determined by the absence of the need to use traditional two-dimensional concatenated structures.

Information Society: Theory and Practice

2010 ◽  
pp. 81-90
Author(s):  
T. Rovinskaya
Keyword(s):  
Social Relations ◽  
Information Society ◽  
Information Transfer ◽  
Interactive Television ◽  
Theoretical Aspect ◽  
Theory And Practice ◽  
Internet Communication ◽  
Communication Models ◽  
Modern Condition ◽  
Modern Technologies

The research is devoted to the information society phenomenon analysis both in theoretical aspect (the term genesis, the concept development) and in practice. The historical evolution of the information transfer technical means and social communication models is thoroughly analyzed. Primary attention is focused on modern technologies, which enabled the emergence of new social relations: the hypermedia (including the interactive television) and Internet platforms (Web 1.0, 2.0 and 3.0). Creation of a "virtual reality" predetermined the introduction of the so called "Network Society" – a society based on the Internet-communication. Not only wide factual evidence, but also different viewpoints on history, modern condition and prospects of the information society are provided in the article.

scholarly journals Influence of synchronization errors оn the noise immunity of coherent reception of M-PSK signals

2019 ◽  
Vol 7 (5) ◽  
pp. 47-61 ◽  
Author(s):  
G. V. Kulikov ◽  
Nguyen Van Dung
Keyword(s):  
Information Transfer ◽  
Noise Immunity ◽  
Clock Synchronization ◽  
Signal To Noise Ratio ◽  
Dynamic Error ◽  
Radio Waves ◽  
Satellite Television ◽  
Synchronization Errors ◽  
Dynamic Errors ◽  
Ieee 802.11 Wireless Networks

Signals with multiple phase-shift keying (M-PSK) have long been successfully used for highspeed information transfer in many applications – a number of adopted protocols of IEEE 802.11 wireless networks, digital satellite television DVB-S, DVB-S2/S2X systems, cellular networks CDMA and others. The most important characteristic of such systems is their noise immunity, which depends not only on the propagation conditions of radio waves in the communication channel, but also on the quality of operation of the component nodes of the information transmission systems themselves. The paper investigates the influence of the inaccuracy of estimating the frequency and phase of the carrier and the inaccuracy of the clock synchronization system on the noise immunity of coherent reception of M-PSK signals. Analytical expressions were obtained by statistical radio engineering methods. The expressions allow calculating the dependence of the probability of a bit error on the signal-to-noise ratio for various errors of the receiver auxiliary systems. In this case, the magnitudes of the errors were assumed to be either constant (static error) or dynamically changing (dynamic error). The dynamic errors were modeled using the Monte Carlo method, and the dynamic errors themselves were assumed to be Gaussian random variables. It is shown that the inaccuracy of estimating these parameters strongly influences the noise immunity of the coherent reception of the M-PSK signal, and this effect increases with increasing signal positionality. Estimates of the maximum permissible errors of the analyzed systems are given. When M-PSK signals are received, a tolerable value of the frequency of the reference oscillations can be considered as a ∆ωTs value of about 0.05. The allowable inaccuracy of the carrier phase estimation depends on the positioning of the signal and varies from π/36–π/72 for 2PSK to π/180 for 32PSK. The allowable time offset of the clock moments can be considered the value of 3–5% of the clock interval duration.

scholarly journals Increases of capacity of telecommunication system with МІМО

Connectivity ◽  
2020 ◽  
Vol 145 (3) ◽  
Author(s):  
K. O. Domracheva ◽  
◽  
A. V. Voloshenko ◽  
O. L. Zolkyn ◽  
R. M. Kyrychenko
Keyword(s):  
Transfer Rate ◽  
Information Transfer ◽  
Data Transfer ◽  
Signal To Noise Ratio ◽  
Radio Channel ◽  
System Capacity ◽  
Signal To Noise ◽  
Telecommunication System ◽  
Telecommunication Systems ◽  
Noise Ratio

The actual issue of increasing the data transfer rate in telecommunication systems with MIMO is considered. It is proposed to use an increase in the signal-to-noise ratio due to the processing and addition of signals from parallel antenna channels to increase the throughput of the system by applying quadrature amplitude manipulation. System simulation for MIMO 4x4. The error probability for QAM is calculated. A method is proposed that allows to increase by 4 times the information transfer rate while maintaining the signal duration and, accordingly, the bandwidth of the radio channel. According to the proposed methodology, telecommunication systems can be created with large numbers of multiposition amplitude-manipulated signals, as well as in combination with multiposition phase-shifted signals. It is shown that an increase in the signal-to-noise ratio when processing signals from parallel antenna channels cannot increase the system capacity, but only lead to a decrease in the signal reception error.

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