Monthly Archives: September 2013

19 Sep

IEEE Technical Seminar at Chalmers

Today, Thursday 19th September, you are welcome to attend the IEEE Technical Seminar by Prof. Giulio Colavolpe from the University of Parma, Italy.The seminar is organized by the Department of Signals and Systems, Chalmers University of Technology.

The lectures will be held on:

Thursday 19th of September in Göteborg, at 15.30 hosted by Chalmers,
Location: EDIT-rummet 3364, floor 3, Hörsalsvägen 11, Campus Johanneberg
Title: Spectrally Efficient Systems based on Time-Frequency Packing and Advanced Processing

Abstract:

Shannon theory says that orthogonal signaling with Gaussian inputs achieves capacity on the bandlimited AWGN channel. Hence, for many years, communication systems for quasi-static channels have been designed based on orthogonal signaling. However, when low-order constellations are used, performance can be considerably improved by giving up the orthogonality, thus accepting interference. Faster-than-Nyquist signaling is an example of this paradigm. We describe a new information-theoretic approach to the more general technique of time-frequency packing and we show how it translates into practical design rules. The applications to nonlinear satellite channels and long-haul optical transmissions will be discussed.

Biography:
Giulio Colavolpe was born in Cosenza, Italy, in 1969. He received the Dr. Ing. degree in Telecommunications Engineering (cum laude) from the University of Pisa, in 1994 and the Ph.D. degree in Information Technologies from the University of Parma, Italy, in 1998. Since 1997, he has been at the University of Parma, Italy, where he is now an Associate Professor of Telecommunications at the Dipartimento di Ingegneria dell’Informazione (DII) where he coordinates the activities of the SPADiCLab. In 2000, he was Visiting Scientist at the Institut Eurécom, Valbonne, France.
His research interests include the design of digital communication systems, adaptive signal processing (with particular emphasis on iterative detection techniques for channels with memory), channel coding and information theory. In particular, he is the principal investigator of several research projects funded by the European Space Agency (ESA-ESTEC), by Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR), and by several international telecommunications companies.
He is currently serving as an Editor for IEEE Transactions on Communications and IEEE Wireless Communications Letters and as an Executive Editor for Transactions on Emerging Telecommunications Technologies (formerly European Transactions on Telecommunications). He served as an Editor for IEEE Transactions on Wireless Communications.
He received the best paper award at the 13th International Conference on Software, Telecommunications and Computer Networks (SoftCOM’05), Split, Croatia, September 2005, the best paper award for Optical Networks and Systems at the IEEE International Conference on Communications (ICC 2008), Beijing, China, May 2008, and the best paper award at the 5th Advanced Satellite Mobile Systems Conference and 11th International Workshop on Signal Processing for Space Communications (ASMS&SPSC 2010).
18 Sep

IEEE Technical Seminar at Chalmers

On Friday 20th September, at 11.00, you are welcome to attend the IEEE Technical Seminar by Prof. Giuseppe Caire from the University of Southern California, USA. The seminar will take place at Room MC, Hörsalsvägen 5, Chlamers. The title of the seminar is On the Application of Nested Lattice Coding in Wireless Networks.

Location: Room MC, Hörsalsvägen 5, Campus Johanneberg.
Time: 11.00
Title: On the Application of Nested Lattice Coding in Wireless Networks

 

Abstract:

Lattice coding has emerged as a fundamental theoretical tool in the Information Theory of Gaussian networks. Lattice codes under lattice decoding achieve the capacity of the Gaussian channel, achieve the diversity-multiplexing tradeoff of quasi-static MIMO point to point channels, have been used to construct ”practical” Costa Coding and Wyner-Ziv coding schemes and, more recently, have been widely applied to relay networks (compute and forward scheme) and interference channels (signal-level interference alignment).

In this talk, we review a number of recent applications of nested lattice coding. In particular, we consider simple multi-access and broadcast relay networks modeling the uplink and the downlink of Distributed Antenna Systems (DAS) with a capacity constrained digital backhaul and centralized decoding (for the uplink) and precoding (for the downlink). We introduce ”Reverse Compute and Forward” as a new downlink precoding scheme for DAS that explicitly takes into account the limited backhaul capacity. Then, we consider a class of network-coded two-user cognitive interference channel where one sender has the two messages and the other sender has a rank-deficient linear combination of the two messages, and show that lattice coding can achieve 2 degrees of freedom and in general a significant improvement of the generalized degrees of freedom, while it is known that the standard cognitive case does not improve the degrees of freedom. We consider also applications to a 2x2x2 MIMO network and to a diamond relay network. In the first case, lattice coding yields the best known degrees of freedom and a sizable finite SNR performance, while in the second case we show how to achieve full duplex relaying with half duplex relays.

Biography:

Giuseppe Caire was born in Torino, Italy, in 1965. He received the B.Sc. degree in electrical engineering from Politecnico di Torino, Italy, in 1990, the M.Sc. degree in electrical engineering from Princeton University, Princeton, NJ, in 1992 and the Ph.D. degree from Politecnico di Torino, in 1994. 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 now Professor with the Electrical Engineering Department of the Viterbi School of Engineering, University of Southern California, Los Angeles.

He received the Jack Neubauer Best System Paper Award from the IEEE Vehicular Technology Society in 2003, and the IEEE Communications Society and Information Theory Society Joint Paper Award in 2004 and in 2011. Dr. Caire served as an Associate Editor for the IEEE TRANSACTIONS ON COMMUNICATIONS in 1998–2001 and as an Associate Editor for the IEEE TRANSACTIONS ON INFORMATION THEORY in 2001–2003 and was President of the IEEE Information Theory Society in 2011.