I.М. Lerner1, R.R. Fayzullin2, А.N. Khairullin3, D.V. Shushpanov4, V.I. Il’in5, I.V. Ryabov6
1–3 Kazan National Research Technical University A.N. Tupolev – KAI (Kazan, Russia)
4 St. Petersburg State University of Telecommunications. prof. M.A. Bonch-Bruevich (St. Petersburg, Russia)
5 Kazan (Privolzhsky) Federal University (Kazan, Russia)
6 Volga State Technological University (Yoshkar-Ola, Russia)