A.S. Podstrigaev1, Tran Huu Nghi2, D.A. Kalinin3, Nguyen Trong Nhan4

1–3 Saint Petersburg Electrotechnical University «LETI» (Saint Petersburg, Russia)
4 Le Quy Don Technical University (Hanoi, Vietnam)

1 ap0d@ya.ru, 2 huunghiht@gmail.com, 3 dimk.a.a@inbox.ru, 4 10th20th30th@gmail.com