Yu.E. Sedelnikov - Dr. Sc. (Eng.), Professor, Department «Radio-Electronic & Telecommunication Systems», Kazan National Research Technical University named after A.N. Tupolev. E-mail: sed@ru.kstu-kai.ru O.V. Potapova - Ph. D. (Eng.), Associate Professor, Department «Radio-Electronic & Telecommunication Systems», Kazan National Research Technical University named after A.N. Tupolev. E-mail: potapova_olga@bk.ru