作者机构:[1]School of Information Engineering, Yanshan University, Qinhuangdao 066004, China, [2]School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
相关基金:This work was supported by the National Natural Science Foundation of China (60832001), and the Science and Technology Planning Project of Qinhuangdao, Hebei Province of China (201001A052).