Alexey Nekrasov
1) Department of Radio Engineering Systems, Saint Petersburg Electrotechnical University, 197022 Saint Petersburg, Russia. 2) Institute for Computer Technologies and Information Security, Southern Federal University, 347922 Taganrog,
Russian Federation

Alena Khachaturian
Department of Radio Engineering Systems, Saint Petersburg Electrotechnical University, 197022 Saint Petersburg,
Russian Federation

Colin Fidge
Faculty of Science, Queensland University of Technology (QUT), Gardens Point Campus, Brisbane, QLD 4001,
Australia