1. School of Elect. Inform. & Commun., Huazhong Univ. of Science & Technology,China
2. School of Mech. Eng. and Elect. Inform., China University of Geosciences,China
3. School of Computer Science and Engineering, at Nanyang Technological University,Singapore
4. Institute for Infocomm Research, A*STAR,Singapore
5. Virginia Tech,Bradley Department of Electrical and Computer Engineering,VA,USA