Imperial College London > Talks@ee.imperial > Bruno Clerckx's list > Interference Alignment with Quantized Grassmannian Feedback for the K-user MIMO Interference Channel

Interference Alignment with Quantized Grassmannian Feedback for the K-user MIMO Interference Channel

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After recalling the definition and basic properties of the multiple-input multiple-output (MIMO) K-user interference channel, I will focus on the (now classical) technique of interference alignment (IA) and discuss its applicability when the channel state information (CSI) available at the transmitter is imperfect. I will present recent work where a CSI feedback scheme based on quantization on the Grassmann manifold was introduced for IA-based transmission. The method is applicable to several scenarios, in particular we consider over-the-air quantized feedback from the mobiles to the base stations (as would be the case in FDD systems) and quantized CSI exchange between base stations, over the backhaul network (as would arise in TDD systems where the CSI can be obtained via reciprocity). The scaling with the transmit power of the number of feedback bits required to preserve the multiplexing gain that can be achieved under perfect channel state information is characterized. We demonstrate through simulation that the proposed scheme outperforms the naive feedback scheme consisting in independently quantizing the channel matrices, in the sense that it yields a better sum rate performance for the same number of feedback bits.

Maxime Guillaud http://www.nt.tuwien.ac.at/staff/maxime-guillaud/

Short bio: Dr. Guillaud received the M.Sc. degree in Electronics Engineering from Ecole Nationale Superieure de l’Electronique et de ses Applications (ENSEA), Cergy, France, in 2000, and the Ph.D. in Electrical Engineering and Communications from ENST , Paris, France, in 2005. From 2000 to 2001 he was a research engineer at Bell Laboratories in Holmdel, NJ, USA . From 2006 to 2010, he was a Senior Researcher at the FTW in Vienna, Austria. Since March 2010, he is a researcher with Vienna University of Technology, Vienna, Austria. Dr. Guillaud is the author of over 40 research papers and communications and holds one patent. He is the recipient of a SPAWC 2005 student paper award, and co-recipient of the Mario Boella Business Idea prize of the NEWCOM NoE in 2005. He worked on the transceiver architecture of multi-user cellular systems, as well as on various aspects of wireless channel modeling, including sparse representations and channel state inference methods. He introduced the principle of relative calibration for the exploitation of channel reciprocity. His recent interests include interference management in wireless systems. Dr. Guillaud was a contributor to the FP6 Newcom and FP7 Newcom++ NoEs, of the FP6 MASCOT project, and is a key member of the EU FP7 project HIATUS . Dr. Guillaud is a Senior Member of IEEE .

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