R.V. Klimov - Post-graduate student, Dept. of telecommunications, Ulyanovsk State Technical University. E-mail: chorrus@mail.ru
D.N. Solodovnikova - engineer, OJSC Rostelecom. E-mail: d.solodovnikova@mail.ru

A.A. Gladkikh - Ph. D. (Eng.), Associate Professor, Professor, Department «Telecommunications», Ulyanovsk State Technical University E-mail: a_gladkih@mail.ru N.A. Pchelin - Post-graduate Student, Department «Telecommunications», Ulyanovsk State Technical University E-mail: pna3@yandex.ru