Efficient Channel Estimation for Reconfigurable MIMO Antennas: Training Techniques and Performance Analysis

Multifunctional and reconfigurable multiple-input multiple-output (MR-MIMO) antennas are capable of dynamically changing the operation frequencies, polarizations, and radiation patterns, and can remarkably enhance system capabilities. However, in coherent communication systems, using MR-MIMO antenna...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2017-01, Vol.16 (1), p.565-580
Main Authors: Bahceci, Israfil, Hasan, Mehedi, Duman, Tolga M., Cetiner, Bedri A.
Format: Article
Language:English
Subjects:
Antenna radiation patterns
Channel estimation
Estimation
MIMO
Multifunctional and reconfigurable antennas
multipath channels
Training
Wireless communication
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Summary:Multifunctional and reconfigurable multiple-input multiple-output (MR-MIMO) antennas are capable of dynamically changing the operation frequencies, polarizations, and radiation patterns, and can remarkably enhance system capabilities. However, in coherent communication systems, using MR-MIMO antennas with a large number of operational modes may incur prohibitive complexity due to the need for channel state estimation for each mode. To address this issue, we derive an explicit relation among the radiation patterns for the antenna modes and the resulting channel gains. We propose a joint channel estimation/prediction scheme where only a subset of all the antenna modes is trained for estimation, and then, the channels associated with the modes that are not trained are predicted using the correlations among the different antenna modes. We propose various training mechanisms with reduced overhead and improved estimation performance, and study the impact of channel estimation error and training overhead on the MR-MIMO system performance. We demonstrate that one can achieve significantly improved data rates and lower error probabilities utilizing the proposed approaches. For instance, under practical settings, we observe about 25% throughput increase or about 3-dB signal-to-noise ratio improvement under the same training overhead with respect to non-reconfigurable antenna systems.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2016.2626291