1. School of Computer Science, Northwestern Polytechnical University, Xi’an, China
2. School of Microelectronics, Northwestern Polytechnical University, Xi’an, China
3. School of Electronics and Information, Northwestern Polytechnical University, Xi’an, China
4. School of Electronic Engineering, Xi’an University of Posts & Telecommunications, Xi’an, China
5. China Key System & Integrated Circuit Co., Ltd, Wuxi, China