中文摘要：

SHI Chunguang, is currently a Ph.D. candidate in National University of Defense Technology, Changsha,China. His research interests include cooperative communications, cross-layer design and optimization, and multi-channel MAC protocol design for wireless ad hoc networks. Emaii： c.g.shi@nudt.edu.cn ZHAO Haitao, received his Ph.D. degree in informa- tion and communication engineering from National University of Defense Technology, China. He is a Lecturer of College of Electronic Science and Engi- neering in National University of Defense Technology. His main research interests include available band- width estimation in wireless networks, cognitive and cooperative communications, cross-layer design and optimization, and multi-channel MAC protocol de- sign. Email： haitaozhao@nudt.edu.cn ZHANG Shaojie, is currently a Ph.D. candidate in National University of Defense Technology, Changsha China. His research interests include wireless network protocol performance analysis and multi-channel MAC protocol design. IVlA Dongtang, received his Ph.D. degree in informa- tion and communication engineering from National University of Defense Technology, China. He is a Professor of College of Electronic Science and Engi- neering in National University of Defense Technology. His research interests include several aspects of co- operative communication and network： cooperative MIMO, cooperative MAC protocol, multi-user MIMO, cooperative transmit beam forming as weLL as multi- channel MAC protocol design. WEI Jibo, received his Ph.D. degree in electronic engineering from Southeast University, China. He is currently a Professor and Director of the Department of Communication Engineering in National University of Defense Technology, Changsha, China. His re- search interests include wireless network protocol and signal processing in communications, more spe- cifically, the areas of MIMO, multicarrier transmission, cooperative communication, and cognitive network. He is a senior member of China Institute of Commu- nications.