1. Key Laboratory of Information and Communication Systems, Ministry of Information Industry, and the Key Laboratory of Modern Measurement and Control Technology, Ministry of Education, Beijing Information Science and Technology University, Beijing, China
2. School of Electrical and Electronic Engineering, University College Dublin, Dublin, Ireland
3. School of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K.
4. China Academy of Information and Communications Technology (CAICT), Beijing, China
5. Department of Electrical Engineering and Computer Science, Khalifa University, Abu Dhabi, United Arab Emirates