1. School of Electrical and Electronic Engineering, Nanyang Technological University, Jurong West, Singapore
2. Wuhan Maritime Communication Research Institute, Wuhan, China
3. School of Information Science and Electronic Engineering, Hangzhou City University, Hangzhou, China
4. Hangzhou Institution of Technology, Xidian University, Hangzhou, China
5. Intelligent Network Research Center, Zhejiang Laboratory, Hangzhou, China
6. College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, China