XIE Xian-zhong, Ph.D., professor; research fields: cognitive radio networks, MIMO and preceding, signal processing for wireless communications. He is the director of Institute of Personal Communications, the principal author of four books on 3G, MIMO, Cognitive Radio and TDD Technology. He has published more than 80 papers in journals and 30 papers in international conferences. DONG Xue-tao, Master, lecture; research fields: wireless networks, computer networks.