I.V. Sivchek - Post-graduate Student, Assistant, Department «Radioengineering and Telecommunications», Peter The Great St.Petersburg Polytechnic University. E-mail: cotgreat@gmail.com V.A. Sorotsky - Dr. Sc. (Eng.), Associate Professor, Head of Department «Radioengineering and Telecommunications», Peter The Great St.Petersburg Polytechnic University. E-mail: sorotsky@mail.spbstu.ru M.N. Tolubaev - Student, Peter The Great St.Petersburg Polytechnic University. E-mail: kazimir2336415@yandex.ru