1. State Key Laboratory of Marine Resource Utilization in South China Sea and School of Information and Communication Engineering, Hainan University, Haikou, China
2. Department of Automation, Hangzhou Dianzi University, Hangzhou, China
3. School of Computer Science and Cyberspace Security, Hainan University, Haikou, China
4. Department of Information and Electronic Engineering, Muroran Institute of Technology, Muroran, Japan