Corresponding author. Donghua Chela was born in 1977. He received his Ph.D. degree in communication and informa- tion system from Xidian University in 2011. Now he is a lecture in Huaqiao University. His research interests are in the area of channel estimation and equalization for wideband wireless communica- tions over doubly selective channels. E-mail: dhchen0@ 163.com Hongblng Qiu was bom in 1963. He received his B.S., M.S. and Ph.D. degrees in information and communication engineering from Xidian Univer- sity in 1984, 1991, and 2004, respectively. Now, he is a professor of Information and Communi- cation College at Guilin University of Electronic Technology. He also serves as a Ph.D. students advisor at Xidian University. His research in- terests include ultra-wideband wireless commu- nication systems and wireless sensor networks. E-mail: qiuhb@guet.edu.cn