1. College of Information Engineering and Automation, Civil Aviation University of China, South Campus, Tianjin 300300, China
2. Department of Engineering Design and Mathematics, University of the West of England, Frenchy Campus, Coldharbour Lane, Bristol, BS16 1QY, UK
3. Freescale Semiconductor (China) Limited, Tianjin 300385, China
4. Tianjin College, University of Science & Technology Beijing, Tianjin 301830, China