1. Volga State University of Telecommunications and InformaticsSamaraRussia
2. V.A. Kotel'nikov Institute of Radio Engineering and Electronics, Russian Academy of SciencesMoscowRussia
3. JNU‐IREE Joint Laboratory of Fractal Method & Signal ProcessingDepartment of Electronic EngineeringCollege of Information Science and Technology, JiNan UniversityGuangzhouPeople's Republic of China