作者机构:Wireless Technology Innovation Institute, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
相关基金:supported by Sino-Swedish Project (2008DFA12110); Key Project of BMSTC (D08080100620802); the National Natural Science Foundation of China (60872048); the National Science and Technology Special Project ‘Group Cell’ (2009ZX03003-011)