Diversity and degrees of freedom: exploring future wireless networks

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• Dr. Yijia (Richard) Fan, Princeton University, U.S.A.
• Wednesday 25 November 2009, 14:00-16:00
• Dennis Gabor Seminar Room 611, EE Dept..

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This talk focuses on exploring both diversity and degrees of freedoms in future wireless networks, notably cooperative networks. Two types of networks are discussed, i.e., coded networks (e.g., cellular networks) and uncoded networks (e.g., sensor networks). In coded networks, both half duplex and full duplex relaying are considered. One well known disadvantage of half duplex relaying is its associated loss in the degrees of freedom. Here, simple coding and relaying protocols are developed to retain the degrees of freedom of direct (non-relay) transmission while offering full diversity. Furthermore, it is shown in coded networks that degrees of freedom higher than that of direct transmission can be obtained by using full-duplex relaying. This result points a new direction for exploiting the benefits of relay networks. In uncoded networks where half duplex is assumed, simple schemes are developed to offer the same optimal diversity and the degrees of freedom as offered by coded systems.

Brief bio:

Yijia (Richard) Fan received his BEng degree in electrical engineering from Shanghai Jiao Tong University (SJTU), Shanghai, P.R. China, in July 2003, and PhD degree from the Institute for Digital Communications, University of Edinburgh, UK, March, 2007. His PhD project was fully funded by Engineering and Physical Sciences Research Council (EPSRC), UK. He is currently a postdoctoral research associate in Department of Electrical Engineering, Princeton University. His research interests include signal processing, information theory and their applications in future wireless networks. URL : http://www.princeton.edu/~yijiafan/

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