1. Department of Information and Communication Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
2. Department of Computer Science, Texas Southern University, Houston, TX 77004, USA
3. Department of Electric and Communication Engineering, Cankaya University, 06790 Ankara, Turkey
4. Department of Electrical, Electronic and Power Engineering, Aston University, Birmingham B4 7ET, UK
5. Department of Computer and Network Science, Telecom ParisTech, 75013 Paris, France