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Home | Seminars and Symposia | Past seminars/symposia: Monday, March 8, 2004

DTC Seminar Series

Interactions of Information Theory and Estimation in Single- and Multi-user Communications

by

Dongning Guo
Department of Electrical Engineering
Princeton University

Monday, March 8, 2004
1:00 pm

402 Walter Library

Dongning Guo

Download slides pdf (998 KB) Single-user and multi-user communication systems, ubiquitous in modern life, are studied from both the viewpoint of information theory and that of the theory of detection and estimation. First, a fundamental law is discovered for both discrete- and continuous-time scalar/vector Gaussian channels. That is, regardless of input distribution, the derivative of the input-output mutual information with respect to the signal-to-noise ratio is equal to half the minimum mean-squared error in estimating the channel input given the output. This relationship is also generalizable to channels where the noise process has independent increments (e.g. Poisson channels). The law uncovers intimate connections between information theory and estimation that can be exploited in many applications.

Dongning Guo

We then focus on the multi-user (vector) fading channel and its signal detection. Using statistical physics methodologies, a complete characterization is obtained for multi-user systems in which the number of users and the aggregate bandwidth become large. We show that, regardless of signaling, the multi-user channel can be decoupled, namely, each user experiences an equivalent single-user channel where the multi-access interference is summarized as an additive Gaussian random variable. The error performance and channel capacity are then found analytically. These results reveal simple laws in large communication networks with highly complicated interference structures.

Dongning Guo

 

Dongning Guo received the B.E. degree from the University of Science and Technology of China in 1995, the M.Eng. degree from the National University of Singapore in 1999, and the M.A. degree from Princeton University in 2001, all in electrical engineering. From 1998 to 1999, he was an R&D Engineer in the Centre for Wireless Communications, Singapore. He is currently a research assistant and Ph.D. candidate at the Department of Electrical Engineering, Princeton University. His research interests are in wireless communications, communication networks, information theory, and signal processing. He received a Best Student Paper Award in the International Zurich Seminar on Broadband Communications in 2000.