1. Graduate Program in Electrical Engineering, Federal University of Ceará, Fortaleza 60455-760, Brazil
2. Graduate Program in Teleinformatics Engineering, Federal University of Ceará, Fortaleza 60455-970, Brazil
3. Controladoria e Ouvidoria Geral do Estado, Governo do Estado do Ceará, Fortaleza 60822-325, Brazil
4. Department of Teleinformatics Engineering, Federal University of Ceará, Fortaleza 60455-970, Brazil