中文摘要：

Lu Rong was born in 1973. She is a Ph.D. candidate of Department of Electronics Engineering, Tsinghua University since 2001. Her research interest is in the field of satellite communication, ATM, QoS. Cao Zhigang was born in 1939. He is currently a professor and deputy director of the State Key Laboratory on Microwave and Digital Communications. His research interests include mobile communications, satellite communications and digital signal processing.