1. Department of Electrical and Computer Engineering, University of Cyprus, Nicosia, Cyprus
2. Department of Electrical Engineering, Institute for Digital Communications, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
3. Academy of Interdisciplinary Studies, The Hong Kong University of Science and Technology, Hong Kong, Hong Kong
4. Department of Electrical and Computer Engineering, School of Information and Communication Engineering, Sungkyunkwan University, Suwon, South Korea
5. Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea