1. Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou 510632, China
2. Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
3. Guangdong Provincial Engineering Technology Research Center on Visible Light Communication and the Guangzhou Municipal Key Laboratory of Engineering Technology on Visible Light Communication, Jinan University, Guangzhou 510632, China
4. Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA