6-19

UDC 621.396.94
DOI: 10.15350/2306-2819.2018.3.6

DEVELOPING MODELS AND ALGORITHMS FOR STUDYING THE EFFECTS OF NONLINEAR FREQUENCY DISPERSION IN TRANSIONOSPHERIC COMMUNICATION CHANNELS WITH DISPERSION DISTORTIONS

A. A. Kislitsin¹, V. V. Ovchinnikov¹, O. A. Trushkova^{1, 2}
¹Volga State University of Technology,
3, Lenin Square, Yoshkar-Ola, 424000, Russian Federation
E-mail: KislitsinAA@volgatech.net
²Branch of the Federal State Unitary Enterprise «Radio Frequency Centre
of the Central Federal District» (GRFC) for the Volga Federal District,
8A, Ryabinina str., Yoshkar-Ola, 424002, Russian Federation

ABSTRACT

Introduction. Earth’s ionosphere is a medium with frequency dispersion caused by the dependence of the phase velocity of the wave propagation on the frequency. The influence of the effect increases with the increase in the signal bandwidth. The negative impact of frequency dispersion is signal distortions due to the break in phase relations of signal components. Estimating dispersion distortions in a transionospheric radio channel can be performed by means of the following approaches: modeling and studying dispersion characteristic - in the frequency domain, and impulse response in the time domain. The aim of the research was to develop a model and an algorithm for studying the effects of nonlinear phase frequency dispersion on system characteristics of wideband transionospheric communication channels. To achieve the goals, we pinpointed the following tasks: analysis of the principles of communication over the transionospheric radio channel; derivation of expressions for estimating parameters of phase frequency dispersion; development of the model and algorithm to study dispersion characteristic, frequency response (FR) and impulse response (IR); testing the model and analysis of the experimental results. Research method. We used the common approach for describing propagation of wave packets when the propagation in a medium is modeled by an equivalent linear system and its associated frequency response, impulse response and dispersion characteristic. In this case applying the method of Taylor series expansion of signal phase around the mid-band (carrier) frequency is adequate. To obtain a rough estimates of dispersion distortions caused by the second-order dispersion, we used a method that involves studying channel coherent bandwidth. The behavior of distortions and their quantitative measures were estimated by studying the channel impulse response. Results. We experimentally found critical TEC values for a mid-latitude region both for quiet and disturbed ionosphere. These data were used to model dispersion characteristic, channel impulse response as well as to calculate the second- and the third-order dispersion parameters. We shall note that distortions in transionospheric communication radio channels are significant when . That limits the use of the optimum channel bandwidth. Moreover, considering the quadratic and cubic components in the phase causes the changes in the channel impulse response envelope.

KEYWORDS

transionospheric radio channel; phase frequency dispersion; frequency response; dispersion characteristic; impulse response; coherent bandwidth

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ACKNOWLEDGMENT

This work was supported by the grants №18-37-00079; №17-07-00799; № 18-07-01377 from the Russian Foundation for Basic Research.

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For citation: Kislitsin A. A., Ovchinnikov V. V., Trushkova O. A. Developing Models and Algorithms for Studying the Effects of Nonlinear Frequency Dispersion in Transionospheric Communication Channels with Dispersion Distortions. Vestnik of Volga State University of Technology. Ser.: Radio Engineering and Infocommunication Systems. 2018. No 3 (39). Pp. 6-19. DOI: 10.15350/2306-2819.2018.3.6