1. School of Internet Finance and Information Engineering, Guangdong University of Finance, Guangzhou, China
2. School of Electronics and Information Engineering, South China University of Technology, Guangzhou, China
3. Guangdong Provincial Key Laboratory of Short-Range Wireless Detection and Communication, South China University of Technology, Guangzhou, China
4. School of Software, Zhengzhou University of Light Industry, Zhengzhou, China
5. School of Information Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, China