1. Department of Radio Electronics, Faculty of Electrical Engineering and Communication; Brno University of Technology; Technicka 12 Brno 616 00 Czech Republic
2. Department of Telecommunications, Faculty of Electrical Engineering and Communication; Brno University of Technology; Technicka 12 Brno 616 00 Czech Republic
3. Department of Electrical Engineering and Computer Science; College of Polytechnics Jihlava; Tolsteho 16 Jihlava 586 01 Czech Republic