College of Physics and Electronic Information;
Anhui Normal University;
Wuhu;
241000 China;
College of Communications and Information Engineering;
Nanjing University of Posts and Telecommunications;
Nanjing;
210003 China;
Department of Electrical and Computer Engineering;
Auburn University;
Auburn;
AL 36849-5201 USA;
School of Computing;
University of the West of Scotland;
Paisley;
PA 1 2BE;
UK;