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

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.

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

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.

scholarly journals Study of scrambling coding sequence utilization in telecommunication networks of information systems

2020 ◽  
Vol 69 (2) ◽  
Author(s):  
O. G. Plyushch ◽  
◽  
V. V. Vyshnivskyi ◽  
S. V. Prokopov ◽  
S. M. Ishcheryakov
Keyword(s):  
Computer Simulation ◽  
Information Systems ◽  
Information Transmission ◽  
Internal Noise ◽  
Telecommunication Networks ◽  
Practical Implementation ◽  
Improve Performance ◽  
Coding Sequences ◽  
Coding Sequence ◽  
Discrete Values

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.

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

Connectivity ◽  
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.

scholarly journals Impact of Background Traffic on Speech Quality in VoWLAN

2007 ◽  
Vol 2007 ◽  
pp. 1-9 ◽  
Author(s):  
Peter Počta ◽  
Peter Kortiš ◽  
Martin Vaculík
Keyword(s):  
Data Transfer ◽  
Speech Quality ◽  
Point Of View ◽  
Telecommunication Networks ◽  
Traffic Load ◽  
Critical Conditions ◽  
Test Sequence ◽  
Perceptual Evaluation ◽  
Background Traffic ◽  
The Impact

This paper describes measurements of the impact of background traffic on speech quality in an environment of WLANs (IEEE 802.11). The simulated background traffic consists of three types of current traffics in telecommunication networks such as data transfer service, multimedia streaming service, and Web service. The background traffic was generated by means of the accomplished Distributed Internet Traffic Generator (D-ITG). The impact of these types of traffic and traffic load on speech quality using the test sequence and speech sequences is the aim of this paper. The assessment of speech quality is carried out by means of the accomplished Perceptual Evaluation of Speech Quality (PESQ) algorithm. The proposal of a new method for improved detection of the critical conditions in wireless telecommunication networks from the speech quality point of view is presented in this paper. Conclusion implies the next application of the method of improved detection of critical conditions for the purpose of algorithms for link adaptation from the speech quality point of view in an environment of WLANs. The primary goal of these algorithms is improving speech quality in the VoWLAN connections, which are established in the competent link.

Optimization Algorithms for Data Transfer in the Grid Environment

2012 ◽  
pp. 502-516
Author(s):  
Muzhou Xiong ◽  
Hai Jin
Keyword(s):  
Data Transfer ◽  
Optimization Algorithms ◽  
Experimental Results ◽  
Grid Environment ◽  
Transfer Data ◽  
Multiple Data ◽  
Transfer Channel ◽  
Efficient Data ◽  
Global Connection

In this chapter, two algorithms have been presented for supporting efficient data transfer in the Grid environment. From a node’s perspective, a multiple data transfer channel can be formed by selecting some other nodes as relays in data transfer. One algorithm requires the sender to be aware of the global connection information while another does not. Experimental results indicate that both algorithms can transfer data efficiently under various circumstances.

The End-to-End Computer Simulation of Casting and Subsequent Metal Forming

2016 ◽  
Vol 685 ◽  
pp. 167-171 ◽  
Author(s):  
Yaroslav Erisov ◽  
Sergey Surudin ◽  
Aleksey Shlyapugin ◽  
Fedor Grechnikov
Keyword(s):  
Computer Simulation ◽  
Residual Stresses ◽  
Metal Forming ◽  
Data Transfer ◽  
End To End ◽  
Transfer Method ◽  
Deform 3D

The paper presents the software and data transfer method between ProCAST and Deform-3D, which allow to take into account the geometry, temperature, residual stresses and microstructure of semi-finished product in the “casting – forming” processes.

scholarly journals Performance Study of Spread Spectrum Systems with Hard Limiters

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.

scholarly journals Comparing Optical Packet Switching And Optical Burst Switching

1970 ◽  
Vol 6 (2) ◽  
pp. 22-32 ◽  
Author(s):  
Sajjad Waheed
Keyword(s):  
Packet Switching ◽  
Data Transfer ◽  
Optical Burst Switching ◽  
Telecommunication Networks ◽  
Optical Packet Switching ◽  
Data Traffic ◽  
Burst Switching ◽  
Bulk Volume ◽  
Near Future ◽  
Optical Burst

The switching is an important part of the telecommunication networks over the years for transferring and handling voice and data through the traditional switching nodes existing in the telecommunication networks. Various developments were seen in the recent years which resulted in increasing data transfer capabilities of the transmission networks all over the world, however the switching speed and techniques are still remained unchanged in most of the cases that neither match the data transfer capacities nor the expanding demand of the networks in the near future. Some switching technologies are still in the developing stage, of them two are more obvious: Optical Packet Switching (OPS) and Optical Burst Switching (OBS). In this paper, I tried to compare different paradigm of these two main developments, keeping in mind that the OPS would see rapid development in the near future than the OBS, though OBS would the ultimate solution of switching for the bulk volume of telephone and data traffic Keywords: Optical Packet Switching; Optical Burst Switching; Bulk Volume; Data Traffic; Wavedivision Multiplexing DOI: http://dx.doi.org/10.3329/diujst.v6i2.9342 DIUJST 2011; 6(2): 22-32

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