1. Key Laboratory of Grain Information Processing and Control, Ministry of Education, College of Information Science and Engineering, Henan University of Technology, Zhengzhou 450001, China
2. School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou 450001, China
3. Department of Electronic Systems, Aalborg University, 9220 Aalborg, Denmark
4. College of Information Engineering, Nanyang Institute of Technology, Nanyang 473000, China