1. School of Electronic Engineering, Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China
2. School of Integrated Circuits, Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China
3. China Telecommunication Technology Labs-Terminals of China Academy of Information and Communication Technology, Beijing, China
4. Beijing University of Posts and Telecommunications, Beijing, China
5. School of Information Science and Engineering, National Mobile Communications Research Laboratory, Southeast University, Nanjing, China