1. School of Information Science and Engineering, Yanshan University, Qinhuangdao, People’s Republic of China
2. Hebei Key Laboratory of Information Transmission and Signal Processing, Qinhuangdao, People’s Republic of China
3. School of Electrical and Information Engineering, Beijing University of Civil Engineering and Architecture, Beijing, People’s Republic of China
4. School of Mathematical & Statistical Sciences,The University of Texas Rio Grande Valley, Edinburg, TX, USA