1. Department of Electronics and Telecommunications, Politecnico di Torino, 10129 Turin, Italy
2. Istituto di Elettronica e di Ingegneria dell’Informazione e delle Telecomunicazioni, National Research Council of Italy, 10129 Turin, Italy
3. Faculty of Electronics and Telecommunications, Politehnica University Timișoara, 300006 Timișoara, Romania
4. Department of Electrical and Computer Engineering, University of Houston, Huston, TX 77204, USA
5. Department of Industrial Engineering and Management, Faculty of Engineering and Information Technology, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Tirgu Mureș, 540139 Tirgu Mureș, Romania