1. Applied Electromagnetism Laboratory, Federal University of Pará, Belém, Brazil
2. Ericsson Research, Ericsson AB, Stockholm, Sweden
3. Ericsson Research, Ericsson Telecomunicações S.A. (Ericsson Brasil), Indaiatuba, Brazil
4. Ericsson Research, Ericsson Telecomunicações S.A. (Ericsson Brasil),
Indaiatuba 13337-300, Brazil