T8 - Signal Processing for Random Access in Wireless Networks: A Cross-Layer Approach
| • | Lang Tong and Qing Zhao, Cornell University, USA |
Emerging applications of wireless networking challenge the current design methodology of medium access control (MAC). The separation between the design of MAC protocols and the design of the physical layer limits the network adaptivity to variations of the wireless channel. For example, the random access scheme employed in IEEE802.11 only has efficiency around 20%. It has become the bottleneck to wideband applications such as HDTV in home networking.
In this tutorial, we present an overview of classical random access techniques and recent development in the paradigm of cross-layer design. In particular, we consider the interaction between and the joint design of the MAC layer and the multi-user physical layer enabled by sophisticated signal processing techniques. Multimedia wireless LAN and large scale sensor networks are used as examples to demonstrate the potential performance gain of the cross-layer approach.
Lang Tong (S'87,M'91, SM'01) is a Professor in the School of Electrical and Computer Engineering, Cornell University, Ithaca, New York. He received the B.E. degree from Tsinghua University, Beijing, China, in 1985, and M.S. and Ph.D. degrees in electrical engineering in 1987 and 1990, respectively, from the University of Notre Dame, Notre Dame, Indiana. He was a Postdoctoral Research Affiliate at the Information Systems Laboratory, Stanford University in 1991. He was also the 2001 Cor Wit Visiting Professor at the Delft University of Technology.
Dr. Tong received Young Investigator Award from the Office of Naval Research in 1996, and the Outstanding Young Author Award from the IEEE Circuits and Systems Society. His areas of interest include statistical signal processing, wireless communications, communication networks and sensor networks, and information theory.
Qing Zhao (S'97,M'02) received the B.S. degree in 1994 from Sichuan University, Chengdu, China, the M.S. degree in 1997 from Fudan University, Shanghai, China, and the Ph.D. degree in 2001 from Cornell University, Ithaca, NY, all in Electrical Engineering.
From August 2001 to January 2003, she was a Communication System Engineer with Aware, Inc., Bedford, MA. Currently, she is a Postdoctoral Research Associate with the School of Electrical and Computer Engineering at Cornell University. Her research interests include signal processing, communications, wireless networking, and information theory. She received the IEEE Signal Processing Society Young Author Best Paper Award.
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