Imperial College London > Talks@ee.imperial > COMMSP Seminar > On Channel Estimation in Cooperative Relay Networks

On Channel Estimation in Cooperative Relay Networks

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It is well known that in wireless communication systems, employing multiple antennas can boost the transmission capacity which, in turn, increases the overall data throughput. Unfortunately, packing many antennas onto a small mobile terminal normally faces the practical difficulty of the size limit. In order to overcome this limitation, one would refer to the relay network, where the space diversity could be exploited from the existing relay nodes in the network. The relay based transmission is usually divided into two phases. During Phase I, the source broadcasts its own information bits to all relays. During Phase II, the relays would either choose to purely amplify and retransmit the information to the destination, or to decode the information first and then transmit these information bits to the destination. The former process is referred as amplify-and-forward (AF) and the latter is referred as decode-and-forward (DF). Before enjoying all those benefits brought by the relay network, an accurate channel state information (CSI) is required at the destination (for AF) or at both relay and destination (for DF). Channel estimation in AF and DF relay networks are completely different from the conventional point-to-point link channel estimation. In this talk, those differences will be explained and novel algorithms for AF and DF relay networks will be presented.

Bio: Dr. Nallanathan is a Senior Lecturer in the Department of Electronic Engineering at King’s College London. Before joining at King’s College London, he was an Assistant Professor in the Department of Electrical and Computer Engineering, National University of Singapore from August 2000 to December 2007. His research interests include cognitive radio, cooperative communications, UWB communications and multimedia communications. He has published more than 150 journal and conference papers in these areas. He is a co-recipient of the Best Paper Award presented at the 2007 IEEE International Conference on Ultra-Wideband (ICUWB’2007). He is an Editor for IEEE Transactions on Wireless Communications and an Associate Editor for IEEE Transactions on Vehicular Technology. He was a Guest Editor for EURASIP Journal on Wireless Communications and Networks: Special issue on UWB Communication Systems-Technology and Applications. He currently serves as the Secretary for the Signal Processing and Consumer Electronics Technical Committee of IEEE Communications Society. He served as the General Track Chair for IEEE VTC ’2008 and the Co-chair for the IEEE GLOBECOM 2008 Signal Processing for Communications Symposium. He currently serves as the Co-chair for the IEEE ICC 2009 Wireless Communications Symposium. He is a Senior Member of the IEEE .

This talk is part of the COMMSP Seminar series.

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