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
N.Yu. Chilikhin - Post-graduate student, Dept. of Telecommunications, Ulyanovsk State Technical University. E-mail: n.chilikhin@gmail.com