Utilization of scrambling coding sequences based on primitive polynomials in telecommunication networks of information systems

Problems of securing noise immunity and information transmission concealment in telecommunication networks of information systems are considered. In order to improve performance, it is proposed to use scrambling coding sequences, which spread the spectrum of the bits being transmitted. To synthesize new scrambling coding sequences, tenth degree primitive polynomial is used. Autocorrelation properties of the obtained scrambling coding sequence are studied. Limitations caused by those properties are deduced. In order to establish a possibility of synthesized scrambling coding sequence use in the telecommunication networks data transmission channels, it is carried out computer simulation of the transmission process of the bit set, whose spectrum is spread by the obtained sequence. In the process of computer simulation, a mixture of the desired signal in the form of a scrambled bit set, internal noise of information transmission channel and interfering signal was formed. While the powers of the internal noise and interfering signal remained constant, power of the bit sequence gradually assumed three discrete values. As a result of the research, it is established that utilization of the synthesized scrambling sequence permits to perform extraction of the bits being transmitted, under conditions in which the power of the noise interfering signal and the internal noise of the channel surpasses power of the desired channel by up to 18 decibel. The limitations set by the use of the synthesized coding sequence are described. An inference concerning a possibility of obtained coding sequence use in practical implementation of telecommunication channels of information networks is made.

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Studying of the scrambling coding sequence performance based on the ninth order primitive polynomial in telecommunication networks of information systems

Connectivity ◽

10.31673/2412-9070.2020.034149 ◽

2020 ◽

Vol 145 (3) ◽

Author(s):

O. G. Plyushch ◽

◽

V. V. Vyshnivskyi ◽

S. V. Prokopov ◽

S. M. Ishcheryakov

Keyword(s):

Information Systems ◽

Information Transmission ◽

Quality Indicators ◽

Noise Immunity ◽

Telecommunication Networks ◽

Degree Polynomial ◽

Coding Sequences ◽

Coding Sequence ◽

Primitive Polynomial ◽

Transmission Quality

Scrambling coding sequences find wide application in telecommunication networks to improve noise immunity and information transmission concealment. There are many different scrambling coding sequences with different autocorrelation properties from which one can be chosen. In the previous paper the authors researched a possibility of using scrambling coding sequences built on the base of the primitive eighth degree polynomial in telecommunication networks of information systems to enhance noise immunity and concealment of information transmission. This sequence, consisting of two hundred and fifty five chips, showed some good performance in terms of information transmission quality indicators. Nevertheless, some of its limitations were also revealed, which are mostly linked to the number of used chips. This paper aims to overcome the problems by proposing to use scrambling coding sequences based on the ninth degree primitive polynomial. The required polynomial was selected and the needed scrambling sequence generated. This scrambling coding sequence includes five hundred and eleven chips. Computer simulation helped to establish that scrambling coding sequence synthesized using this polynomial permits to substantially improve information transmission quality indicators as compared to the case of the scrambling coding sequence based on the eighth degree polynomial. For example, the interfering signal and internal noise to desired signal ratio, for which reception of transmitted bit sequence is still possible, increased by three decibels. It is clearly linked to the doubling of the number of the used chips. To preserve the transmission rate, the occupied frequency spectrum needs to be doubled. An inference is made as to a possibility of using the synthesized coding sequence in practical realizations of telecommunication channels.

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Integral indicator of adjustment parameters estimation of adaptive antenna arrays for telecommunication networks of information systems

Connectivity ◽

10.31673/2412-9070.2020.044149 ◽

2020 ◽

Vol 146 (4) ◽

Author(s):

O. G. Plyushch ◽

◽

V. V. Vyshnivskyi ◽

S. V. Tolyupa ◽

S. V. Prokopov ◽

...

Keyword(s):

Computer Simulation ◽

Information Systems ◽

Antenna Arrays ◽

Correlation Matrix ◽

Parameters Estimation ◽

Telecommunication Networks ◽

Transient Processes ◽

Adaptive Antenna ◽

Adaptive Antenna Arrays ◽

Integral Indicator

Adjustment speed is one of the main operation features of adaptive antenna arrays with the steepest descent gradient algorithm in telecommunication networks of information systems. Traditionally, estimation of the transient processes involves a computer simulation of the adaptive antenna array according to the selected noise environment. Substantial time required to create a respective model, big computational load that leads to quite a long period of time for performing required mathematical operations, as well as limited possibilities of simulation results interpretations are among the main drawbacks of the traditional approach. The paper proposes an integral indicator of adjustment parameters estimation of adaptive antenna arrays optimized according to the root-mean-square criterion and that does not require performing of the time consuming computer simulation of the transient processes. Integral indicator assumes values from 1, which corresponds to the quickest adaptation process, to 0, which indicates an absence of adaptation, and is built with account of the eigenvalues distribution of the array correlation matrix, squares of direction cosines of the optimal weight vector on the eigenvalues of the antenna array correlation matrix and the trace of this matrix. Computer simulation helped to establish that the designed indicator permits to correctly predict the speed of the transient processes in adaptive antenna arrays and perform their comparative analysis for different noise environments. Additionally, computation data, which are used for obtaining this indicator, allow us to clearly explain the character of the transient processes in the adaptive antenna arrays.

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Performance Study of Spread Spectrum Systems with Hard Limiters

International Journal of Computer Network and Information Security ◽

10.5815/ijcnis.2020.05.01 ◽

2020 ◽

Vol 12 (5) ◽

pp. 1-15

Author(s):

Oleksandr Pliushch ◽

◽

Viktor Vyshnivskyi ◽

Volodymyr Tolubko ◽

Vadym Mukhin ◽

...

Keyword(s):

Information Transmission ◽

Spread Spectrum ◽

Information Transfer ◽

Dynamic Range ◽

Internal Noise ◽

Telecommunication Networks ◽

Performance Study ◽

Interference Immunity ◽

Primitive Polynomials ◽

Spread Spectrum Systems

Use of spread spectrum systems in telecommunications is studied. It is shown that spread spectrum techniques can substantially enhance noise and interference immunity in the currently deployed information transmission networks. Primitive polynomials are proposed to obtain respective spreading codes. A spreading code consisting of 1023 chips is synthesized and its characteristics are studied. It is deduced that powerful interferences can exceed dynamic range of the receiving part of the system and, as a result, deteriorate information transmission. To overcome this problem, utilization of limiters is proposed, in which limitation level equals that of the internal noise of the receiving part. Computer simulation is employed to test the performance of the proposed solution. Performance of the spread spectrum system for information transfer is studied both without the limiter and with the limiter. Research results show that, for binary modulation, performance of the system with limitation and without limitation is nearly identical while limiters can substantially reduce requirements for the dynamic range. Compared to the existing approaches, it is proposed to use the synthesized spreading coding sequence with the limitation technique in practical implementations of those telecommunication networks, in which noise immunity and transmission concealment are required, such as in unmanned aerial vehicles. This can replace currently used approaches, such as frequency hopping, transmission power adjustment and antenna pattern changes.

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Seventh cranfield international conference on mechanised information storage and retrieval systems.The potential impact of telecommunication networks on information systems intelligence.

World Patent Information ◽

10.1016/0172-2190(81)90157-5 ◽

1981 ◽

Vol 3 (3) ◽

pp. 136

Keyword(s):

Information Systems ◽

Information Storage And Retrieval ◽

Telecommunication Networks ◽

Information Storage ◽

International Conference ◽

Storage And Retrieval ◽

Potential Impact ◽

Systems Intelligence

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Robotechnical System for Analyzing Cyber-Security of Information Communication Systems and Networks

NBI Technologies ◽

10.15688/nbit.jvolsu.2018.2.5 ◽

2018 ◽

pp. 30-38

Author(s):

Valeriy Moskovchenko ◽

Mikhail Gudkov ◽

Oleg Lauta

Keyword(s):

Information Systems ◽

Control Systems ◽

Communication Networks ◽

Cyber Security ◽

Communication Systems ◽

Cyber Attacks ◽

Telecommunication Networks ◽

Cyber Warfare ◽

Cyber Threats ◽

Active Attacks

The paper deals with the various aspects of cybernetic confrontation. The authors substantiate the urgency of creating a proactive protection management system and propose hardware and software solutions based on the development of a mobile robotic system. The paper describes the system designed to audit the stability of the network infrastructure to existing and prospective cyber threats, to its architecture and functionality. Cyber warfare marks a new level of armed confrontation. An urgent requirement of the time, taking into account the robotization of weapons and military equipment, is the revision of the principles of building automated control systems, information systems and communication networks from the viewpoint of ensuring cybersecurity. The co-evolution of the cybersecurity system should provide: the detection of new, previously unknown cyber threats (cyber attacks) during the monitoring (exploration) of cyberspace; the automatic selection of the parameters of the functioning of information systems and communication networks under the conditions of destructive effects without deterioration of their main characteristics (cognitive platforms for building information and telecommunication networks). Intelligence in cyberspace requires digital penetration into the network and control systems of a potential enemy and involves the use of completely new sources, forms and methods of data and information collection, development of new intelligence tools and technologies, tactical and technical techniques. Thus, the system of cyber security should be provided for the possibility of pre-emptive hardware and software effects (pre-emptive attacks) and active attacks on information systems and resources of the opposing side, as well as the ability to misinformation by the opposing side of the true properties and parameters of information systems and communication networks.

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USE OF PSEUDO NOISE CODING SEQUENCE CYCLIC SHIFTS FOR TELECOMMUNICATION CHANNEL PERFORMANCE IMPROVEMENT

Cybersecurity Education Science Technique ◽

10.28925/2663-4023.2020.9.126139 ◽

2020 ◽

Vol 1 (9) ◽

pp. 126-139

Author(s):

Oleksandr Pliushch

Keyword(s):

Computer Simulation ◽

Data Transfer ◽

Telecommunication Networks ◽

Frame Structure ◽

Coding Sequence ◽

Additional Information ◽

Primitive Polynomials ◽

Transfer Channel ◽

Cyclic Shifts ◽

Pseudo Noise

An approach is proposed to design of noise immune and concealed data transfer channel for telecommunication networks. Attention is paid to securing hidden information transmission, as well as its protection from interception by rogue actors. The approach is based on the desired bits spectrum spreading and their additional scrambling by using pseudo noise coding sequences derived from primitive polynomials of eighth and fifteenth orders, which possess good auto and inter correlation properties. It is studied performance of the telecommunication channel that includes frames of 128 bit length, each of which is spectrally spread 256 times with the help of a synthesized pseudo noise coding sequence. The second 32768 chip-long pseudo noise coding sequence is used to mark the frame duration and perform additional information scrambling. Computer simulation is used to study performance of the designed telecommunication channel. The computer simulation helped to establish that the processing of the additive mixture of the desired signal and interfering ones, which surpass the desired signal two times in terms of power, by the matched filters permits to confidently reveal the information frame structure being transmitted by determining frame beginning pulse and establish the bit values of the desired information. Further improvement of information protection from interception is proposed to achieve by using cyclic shifts of 32768 chip-long pseudo noise coding sequence. Computer simulation helped to find out that ignorance of the cyclic shift leads to inability of information interception by the rogue elements. Research results, obtained in this paper, permit to claim that the designed telecommunication channel, with cyclic shifts according to a secret rule, could be successfully used in practical implementations of noise immune and concealed telecommunication networks.

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Practical aspects of noise immune data transmission channel design in telecommunication networks

Telecommunication and information technologies ◽

10.31673/2412-4338.2020.030414 ◽

2020 ◽

Vol 68 (3) ◽

Author(s):

O. G. Plyushch ◽

Keyword(s):

Data Transmission ◽

Telecommunication Networks ◽

Frame Structure ◽

Transmission Channel ◽

Channel Design ◽

Additional Information ◽

Primitive Polynomials ◽

Useful Signal ◽

Pseudo Noise ◽

Noise Sequence

Practical aspects of noise immune data transmission channel design in telecommunication networks are considered. Main accent is made on securing noise immunity and concealment of information transmission, as well as on countering its interception by the rogue elements. It is noted that satisfaction of the mentioned requirements is possible by using spectrum spreading of useful signal bits and deploying data scrambling. Design of telecommunication channel with spectrum spreading and scrambling on the base of pseudo noise coding sequences derived from primitive polynomials of the eighth and fifteenth order that possess good auto and inter correlation properties are proposed. While studying practical aspects of the telecommunication channel design, its structure is put forward that consists of frames counting 256 bits, each of which is spread by using the synthesized pseudo noise sequence. In this case, the second synthesized pseudo noise coding sequence with the length of 32768 chips is used to mark the frame duration and perform additional information scrambling. Computer simulation is employed to study performance of the designed algorithm. Simulation results proved that processing of the additive mixture of the useful signal and interferences, which surpass useful signal two times in their power, by the matched despreading filters permits to confidently determine the frame structure of the information being transmitted by finding frame beginning pulses and determining values of the useful information bits. Analysis of the results obtained during the research permits to assume that designed telecommunication channel can be successfully used while developing noise immune concealed telecommunication networks. It is proposed to carry out further research to study boundary possibilities of the designed telecommunication channel in terms of useful signal to interference ratio.

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