I.A. Cohn - Junior Researcher, Kotelnikov IRE RAS. Е-mail: cohn@hitech.cplire.ru А.G. Kovalenko - Ph.D. (Phys.-Math.), Leading Researcher, Kotelnikov IRE RAS А.S. Ilin - Ph.D. (Phys.-Math.), Junior Researcher, Kotelnikov IRE RAS A.N. Vystavkin - Dr.Sc. (Eng.), Chief Researcher, Professor, Kotelnikov IRE RAS