Capacity Enhancement via Multi-Mode Adaptation in Spatially Correlated MIMO Channels

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Forenza, Antonio; Heath, Robert W. Jr. (Wireless Networking and Communications Group (WNCG), ECE Department, The University of Texas at Austin, Austin, TX, USA)
McKay, Matthew R.; Collings, Iain B. (Telecommunications Lab, Sch. of Elec. and Info Engineering, University of Sydney, Australia)
McKay, Matthew R. (ICT Centre, CSIRO, Australia)
Pandharipande, Ashish (Communications and Networking Lab, Samsung Advanced Institute of Technology (SAIT), Suwon, Korea)

We consider a low-complexity adaptive MIMO transmission approach for spatially correlated channels. The proposed scheme adaptively switches between different transmission modes depending on the changing channel conditions, as a means to enhance system capacity. Each mode is a combination of a transmission technique (ie. statistical beamforming, double space-time transmit diversity and spatial multiplexing) and a modulation/coding scheme. We first motivate our adaptive algorithm by deriving new closed-form capacity expressions, and demonstrating significant information theoretic improvements over non-adaptive transmission. We then present a practical method to switch between different modes, based on the channel statistics. Our approach is shown to yield significant improvements in spectral efficiency for typical channel scenarios.