# Full Duplex Relaying with Half Duplex Relays

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## Event Speaker:

Giuseppe Caire (USC)

32-141

## Event Date/Time:

Tuesday, December 10, 2013 - 4:00pm

Reception to follow.

ABSTRACT
Full duplex relay hardware architectures have attracted a considerable attention recently. These architectures are based on some form of analog self-interference cancellation, in order to prevent the receiver to be saturated by the transmitter power. In addition, digital self-interference cancellation in the baseband takes care of the residual self-interference since analog cancellation is not perfect. Some of these proposals make use of two or more antennas, spaced and oriented in order to limit the self-interference power entering the receiver chain. In this work, we study a virtual'' full-duplex relay scheme constructed by two half-duplex relays. This can be seen (to some extent) as the distributed version of current full-duplex proposals based on multiple antennas. At each time slot, alternatively, one of relays (in reception mode) receives a new data from the source while the other relay (in transmission mode) forwards the processed data (obtained in the previous time slot) to the destination. This relaying operation is known as “successive relaying”. Interestingly, the network topology is identical to the well-known diamond relay network, with the addition of one interfering link between the two relays. The main performance bottleneck of successive relaying is the so-called inter-relay interference that corresponds to the self-interference in full-duplex relays. In this talk, we examine several information theoretic schemes and their achievable rates for successive relaying. Then, we generalize successive relaying to multihop virtual full-duplex relay channels. We shall discuss relative merits and implementation drawbacks of the various schemes, and compare them in terms of their achievable rate. On the practical side, we argue that such configuration of virtual full-duplex relays may serve as a useful building block to form efficient wireless backhaul for small cell networks operating in mm-wave bands.

BIOGRAPHY
Giuseppe Caire was born in Torino, Italy, in 1965. He received the B.Sc. in Electrical Engineering from Politecnico di Torino (Italy), in 1990, the M.Sc. in Electrical Engineering from Princeton University in 1992 and the Ph.D. from Politecnico di Torino in 1994. He was a recipient of the AEI G.Someda Scholarship in 1991, has been with the European Space Agency (ESTEC, Noordwijk, The Netherlands) from May 1994 to February 1995, was a recipient of the COTRAO Scholarship in 1996 and of a CNR Scholarship in 1997.

He has been visiting Princeton University in Summer 1997 and Sydney University in Summer 2000. He has been Assistant Professor in Telecommunications at the Politecnico di Torino, Associate Professor at the University of Parma, Italy, Professor with the Department of Mobile Communications at the Eurecom Institute, Sophia-Antipolis, France, and he is currently a professor of Electrical Engineering with the Viterbi School of Engineering, University of Southern California, Los Angeles, CA.

He served as Associate Editor for the IEEE Transactions on Communications in 1998-2001 and as Associate Editor for the IEEE Transactions on Information Theory in 2001-2003. He received the Jack Neubauer Best System Paper Award from the IEEE Vehicular Technology Society in 2003, and the IEEE Communications Society \& Information Theory Society Joint Paper Award in 2004 and in 2011. Giuseppe Caire is Fellow of IEEE since 2005. He has served in the Board of Governors of the IEEE Information Theory Society from 2004 to 2007, and as President of the IEEE Information Theory Society in 2011. His main research interests are in the field of communications theory, information theory, channel and source coding with particular focus on wireless communications.