中文摘要：

Baihong Lin received the BE degree from Beijing University of Aeronautics and Astronautics, China, in 2009. He is currently pursuing the PhD degree in Tsinghua University. His major research interests include LDPC encoders and decoders, image processing, medical imaging, computer vision, and machine learning.E-mail：linbaihong111@126.com Yukui Pei received the BEng and PhD degrees from Tsinghua University in 2002 and 2008, respectively. Now he is an associate professor with Department of Electronic Engineering, Tsinghua University. His research interests include channel coding, UWB, and wireless security.To whom correspondence should be addressed.E-mail：peiyk@tsinghua.edu.cn. Liuguo Yin is an associate professor in the School of Aerospace, Tsinghua University, China. He received the MEng and PhD degrees from Tsinghua University, China, in 2002 and 2005, respectively. From March 2005 to March 2007, he was a research assistant with the School of Aerospace, Tsinghua University. From April 2007 to March 2008, he was an ERCIM postdoctoral fellow with the Norwegian University of Science and Technology （NTNU）, Trondheim, Norway. His research interests include channel coding, joint source-channel coding, aerospace communications, and wireless multimedia communication systems. He is a member of IEICE communications society and engineering sciences society.E-mail： yinlg@tsinghua.edu.cn. Jianhua Lu received the BEng and MEng degrees from Tsinghua University, China, in 1986 and 1989, respectively, and the PhD degree in electrical and electronic engineering from Hong Kong University of Science and Technology. He has been with the Department of Electronic Engineering, Tsinghua University, since 1989, where he is currently a professor. He has published more than 180 technical papers in international journals and conference proceedings. His current research interests include broadband wireless communication, multimedia signal processing, satellite communication, and wireless networking. Dr. Lu has been an active memb