Author(s): |
Hai-Feng Zhang, Key Laboratory of Communication and Information Systems, Beijing Municipal Commission of Education, Beijing, 100044 Yun Liu, Key Laboratory of Communication and Information Systems, Beijing Municipal Commission of Education, Beijing, 100044 Fei Ding, Key Laboratory of Communication and Information Systems, Beijing Municipal Commission of Education, Beijing, 100044 Hui Cheng, Key Laboratory of Communication and Information Systems, Beijing Municipal Commission of Education, Beijing, 100044 |