1. School of Automatic and Electronic Information, Xiangtan University, the Hunan National Center for Applied Mathematics, the Key Laboratory of Credible Intelligent Navigation and Positioning of Hunan Province, and the Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education, Xiangtan, China
2. School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo, China
3. College of Physical Science and Engineering, Yichun University, Yichun, China
4. School of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K