作者机构:[1]Laboratory of Wireless Cornmtmication Systems and Networks, Beijing University of Posts and Telecommunications, Beijing 100876, China, [2]Communication Technology Laboratory, Intel China Research Center, Beijing 100190, China
相关基金:This work was supported by the National Natural Science Foundation of China (60872049, 60871042), the Hi-Tech Research and Development Program of China (2007A.A10Z235), and the Teaching and Research Finances for the Returned Overseas Chinese Scholars.