I.V. Sivchek - Post-graduate Student, St. Petersburg State Polytechnical University. E-mail: cotgreat@gmail.com
V.A. Sorotsky - Dr. Sc. (Eng.), Head of Department, St. Petersburg State Polytechnical University. E-mail: sorotsky@mail.spbstu.ru

A.Ya. Sergeev - Ph. D. (Eng.), Senior Research Scientist, Associate Professor, Department «Radio Engineering and Telecommunication Systems», Peter The Great St.Petersburg Polytechnic University E-mail: acsergeev@yandex.ru