1. Key Laboratory for Ubiquitous Network and Service Software of Liaoning Province, School of Software, Dalian University of Technology, Dalian, China
2. Department of Communication Engineering, Institute of Information Science Technology, Dalian Maritime University, Dalian, China
3. State Key Laboratory of Marine Resource Utilization in South China Sea, School of Information and Communication Engineering, Hainan University, Haikou, China
4. School of Electronic Engineering and Intelligence, Dongguan University of Technology, Dongguan, China