1. School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China
2. School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
3. Power China Hubei Engineering Co., Ltd., Wuhan 430000, China
4. Hydro Electric Power System Engineering Company, Wuhan 430000, China