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

DOI:10.31673/2412-4338.2020.027889

Abstract

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.

Keywords: telecommunication network; primitive polynomial; scrambling coding sequences; channel quality indicators; computer simulation; information system.

References
1. Edited by Kamesh Namuduri, Serge Chaumette, Jae H. Kim, James P. G. Sterbenz. UAV Networks and Communications. UK: Cambridge University Press, 2017. 242 p.
2. Andreas Springer, Robert Weigel. UMTS: The Physical Layer of the Universal Mobile Telecommunications System. USA: Springer Science & Business Media, 2013. 298 p.
3. Evgenii Krouk, Sergei Semenov. Modulation and Coding Techniques in Wireless Communications. USA: John Wiley & Sons, 2011. 680 p.
4. Lee, Jhong S., Miller, Leonard E. CDMA systems engineering handbook. Boston, London: Artech House, 1998. 1228 p.
5. Clint Smith, Daniel Collins. Wireless Networks. USA: McGraw Hill Professional, 2013. 752p.
6. Byeong G. Lee, Seok C. Kim. Scrambling Techniques for Digital Transmission. USA: Springer Science & Business Media, 2012. 448 p.