Multiple-input multiple-output (MIMO) antenna systems have recently attracted considerable attention as they offer substantial capacity and performance improvements over single antenna systems without requiring additional power or bandwidth. The initial MIMO research focused on idealized uncorrelated scattering environments, and spawned an explosion of interest in the area.
This tutorial will present an introduction to general MIMO systems, with a particular focus on practical correlated transmission environments. We will discuss a number of low complexity transmission architectures suitable for practical coded MIMO implementations, including the IEEE802.11n and IEEE802.16 standards. The focus of the tutorial will be on examining the potential advantages that can be gained by adapting and switching between different coded MIMO transmission schemes, depending on the quality and correlation in the MIMO channel. A summary of the main analysis techniques will be presented, as well as simulation studies which examine the various system design tradeoffs.
II. OUTLINE
• Introduction
– General MIMO channel model
– Correlated MIMO channels and impact of array configuration
• Low Complexity Transmission Schemes
– Bit-Interleaved Coded Modulation for MIMO
– Spatial multiplexing (SM) schemes (ZF, MMSE, ML, VBLAST)
– Beamforming schemes (Instantaneous, Statistical (SB))
– Space-time block coding (STBC)
• Analysis Techniques
– BER expressions (with a case study)
– Multivariate statistics (Wishart matrices, Quadratic forms, ...)
– Moment generating functions (MGF)
• Practical Adaptive MIMO Schemes & Performance in Correlated Channels
– Uncoded (SM-STBC switching, multi-mode antenna selection, ...)
– Coded SM-SB switching
– Coded SM-STBC switching
Biographies:
Dr. Iain B. Collings
Iain B. Collings (BE Melb, PhD ANU) has held academic positions at the University of Melbourne and the University of Sydney, where he was an Associate Professor. Since August 2005 he has been the Science Leader in Communications and Signal Processing in the ICT Centre of the Commonwealth Scientific and Industrial Research Organization (CSIRO), Australia. He has published over 80 international journal and conference papers, and most recently has focused his research on the capacity and performance of MIMO systems in practical correlated environments. His other research interests include synchronization, channel estimation, equalization, and multi-carrier modulation, for time-varying and frequency-selective channels. Dr Collings currently serves as an Editor for the IEEE Transactions on Wireless Communications, and as a Guest Editor for the EURASIP Journal on Advanced Signal Processing. He is also the Vice Chair of the Technical Program Committee (TPC) for the IEEE Vehicular Technology Conf. (Spring) 2006, and has served on the TPCs of IEEE Int. Conf. on Communications 2005, IEEE Int. Symp. on Spread Spectrum Techniques and Applications 2004, IEEE Vehicular Technology Conf. (Fall) 2003, IEEE GLOBECOM Conf. 2002, and on the Organizing Committees of IEEE Information Theory Workshop 2001, IEEE Int. Symp. on Spread Spectrum Techniques and Applications 2004, and the Australian Communication Theory Workshops 2000-06. He is a Senior Member of the IEEE and a Member of Engineers Australia.
Dr. Robert W. Heath Jr
Robert W. Heath Jr. (BS & MS Virginia, PhD Stanford) has held senior positions in both industry and universities. From 1998-99 he was a Senior Member of the Technical Staff at Iospan Wireless Inc, San Jose, CA where he played a key role in the design and implementation of the physical and link layers of the first commercial MIMO-OFDM communication system. From 1999 to 2001 he served as a Senior Consultant for Iospan Wireless Inc. In 2003 he founded MIMO Wireless Inc. Since January 2002, he has been with the Department of Electrical and Computer Engineering at The University of Texas at Austin where he serves as an Assistant Professor as part of the Wireless Networking and Communications Group. His research interests include interference management in wireless networks, sequence design, and all aspects of MIMO communication including antenna design, practical receiver architectures, limited feedback techniques, and scheduling algorithms. Dr. Heath serves as an Associate Editor for the IEEE Transactions on Communication and the IEEE Transactions on Vehicular Technology.
Mr. Matthew R. McKay
Matthew R. McKay (BE & BIT QUT) is currently working toward the Ph.D. degree in Electrical Engineering at The University of Sydney. To date, he has published 10 international journal and conference papers in MIMO communications. He received the University Medal for his undergraduate degrees.
Mr. Antonio Forenza
Antonio Forenza (BS & MS Politecnico di Torino, Dip Eur´ecom) is currently working toward the Ph.D. degree in Electrical Engineering at The University of Texas at Austin. To date, he has published 20 international journal and conference papers and standards contributions. In 2001 he interned as systems engineer at Iospan Wireless, Inc. (San Jose, CA), a startup company developing high-speed fixed wireless system, based on MIMO-OFDM technology. His main research focus was on link-adaptation and physical layer algorithms design. In the fall 2001 he joined ArrayComm, Inc. (San Jose, CA), where he was involved in the design of smart antenna WCDMA systems. Over the summer 2004 and 2005 he interned as systems research engineer at Samsung Advanced Institute of Technology (SAIT, Suwon, Korea) and Freescale Semiconductor, Inc. (Austin, TX), respectively, designing adaptive MIMO transmission techniques for 3GPP, IEEE 802.11n and IEEE 802.16e standards systems. His research interests include adaptive MIMO techniques, MIMO antenna array design, smart antenna signal processing, precoding techniques for MU-MIMO. |
