A.A. Gladkih - Ph.D. (Eng.), Associate Professor, professor, Dept. of telecommunications, Ulyanovsk State Technical University. E-mail: a_gladkih@mail.ru; a.gladkih@ulstu.ru
E.A. Yudina - Post-graduate student, Dept. of telecommunications, Ulyanovsk State Technical University. E-mail: lenayudina@bk.ru