Affiliation: | 1.State Key Laboratory of Information Photonics and Optical Communications, and School of Science, Beijing University of Posts and Telecommunications, P. O. Box 122, Beijing, 100876, China ;2.School of Electronics and Information Engineering, Wuhan Donghu University, Wuhan, 430212, People’s Republic of China ;3.Department of Physics, Chemistry and Mathematics, Alabama A&M University, Normal, AL, 35762, USA ;4.Department of Mathematics, King Abdulaziz University, Jeddah, 21589, Saudi Arabia ;5.Department of Mathematics and Statistics, Tshwane University of Technology, Pretoria, 0008, South Africa ; |