作者机构:[1]Key Laboratory of Universal Wireless Communication, Beijing University of Posts and Telecommunications, Ministry of Education, Beijing 100876, China, [2]Wireless Technology Innovation Institute, Beijing University of Posts and Telecommunications, Beijing 100876, China
相关基金:Acknowledgements This work was supported by Korean Electronics and Telecommunications Research Institute, the Hi-Tech Research and Development Program of China (2006AA01Z283), and the Natural Science Foundation of China (60772113).