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Impact of Mutual Coupling on Adaptive Switching Between MIMO Transmission Strategies and Antenna Configurations

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Abstract

Adaptive switching between multiple-input multiple-output (MIMO) transmission strategies like diversity and spatial multiplexing is a flexible approach to respond to channel variations. It is desirable to obtain accurate estimates of the switching points between these transmission schemes to realize the capacity gains made possible by adaptive switching. In this paper, it is shown that the accuracy of switching point estimates for switching between statistical beamforming and spatial multiplexing is improved by taking into account the effects of mutual coupling between antenna array elements. The impact of mutual coupling on the ergodic capacities of these two transmission strategies is analyzed, by deriving expressions for the same. Adaptive switching between combinations of transmission strategies and antenna array configurations (using reconfigurable antenna arrays) is shown to produce maximum capacity gains. Expressions for the switching points between transmission strategies and/or antenna configurations, including mutual coupling effects, are derived and used to explore the influence of mutual coupling on the estimates. Finally, measurements taken from reconfigurable rectangular patch antenna arrays are used to validate the analytical results.

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Authors and Affiliations

  1. The University of Texas at Austin, 1 University Station, C0803, Austin, Texas, 78712-0240, USA

    Ramya Bhagavatula & Robert W. Heath Jr.

  2. Rearden, LLC, 355 Bryant Street, Suite 110, San Francisco, CA, 94107, USA

    Antonio Forenza

  3. Drexel University, Philadelphia, 3141 Chestnut Street, Bossone 312, Philadelphia, PA, 19104, USA

    Nicholas J. Kirsch & Kapil R. Dandekar

Authors
  1. Ramya Bhagavatula
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  2. Robert W. Heath Jr.
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  3. Antonio Forenza
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  4. Nicholas J. Kirsch
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  5. Kapil R. Dandekar
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Correspondence to Robert W. Heath Jr..

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Bhagavatula, R., Heath, R.W., Forenza, A. et al. Impact of Mutual Coupling on Adaptive Switching Between MIMO Transmission Strategies and Antenna Configurations. Wireless Pers Commun 52, 69–87 (2010). https://doi.org/10.1007/s11277-008-9513-2

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