P. V. Romanov1, Yu. I. Choni2
1, 2 Kazan National Research Technical University n.a. A.N. Tupolev (Kazan, Russia)

E.I. Glushankov1, S.G. Egorov2

1,2 St. Petersburg State University of Telecommunications named after prof. M.A. Bonch-Bruevich (St. Petersburg, Russia)

1 glushankov57@gmail.com; 2 sgegorov@gmail.com