Authors
Ivelina Stefanova Balabanova
Technical University of Gabrovo, Faculty of Electrical Engineering and Electronics, Department of Communications Equipment and Technologies, Gabrovo city, Bulgaria
Georgi Ivanov Georgiev
Technical University of Gabrovo, Faculty of Electrical Engineering and Electronics, Department of Communications Equipment and Technologies, Gabrovo city, Bulgaria
Stanimir Michaylov Sadinov
Technical University of Gabrovo, Faculty of Electrical Engineering and Electronics, Department of Communications Equipment and Technologies, Gabrovo city, Bulgaria
Stela Savova Kostadinova
Technical University of Varna, Faculty of Electronics, Department of Communications Engineering and Technologies, Varna, Bulgaria