[1] CNRS/TIMA Laboratory, 46 Av. Félix Viallet, 38031 Grenoble, France
[2] Hong Kong University of Science and Technology, Department of Electronic and Computer Engineering, Clear Water Bay, New Territories, Hong Kong
[3] Universidade Federal Do Rio Grande Do Sul, Instituto de Informática, Campus Do Vale, Av. Bento Gonçalves, 9500, Bloco IV, 91501-970 Porto Alegre, Brazil
[4] Chinese University of Hong Kong, Department of Electronic Engineering, Ho Sin Hang Engineering Bldg., Shatin, New Territories, Hong Kong