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International Journal of Antennas and Propagation
Volume 2010, Article ID 213576, 10 pages
http://dx.doi.org/10.1155/2010/213576
Research Article

Optimization of Training Signal Transmission for Estimating MIMO Channel under Antenna Mutual Coupling Conditions

School of ITEE, The University of Queensland, Brisbane QLD 4072, Australia

Received 2 December 2009; Revised 26 February 2010; Accepted 17 March 2010

Academic Editor: Hon Tat Hui

Copyright © 2010 Xia Liu and Marek E. Bialkowski. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper reports investigations on the effect of antenna mutual coupling on performance of training-based Multiple-Input Multiple-Output (MIMO) channel estimation. The influence of mutual coupling is assessed for two training-based channel estimation methods, Scaled Least Square (SLS) and Minimum Mean Square Error (MMSE). It is shown that the accuracy of MIMO channel estimation is governed by the sum of eigenvalues of channel correlation matrix which in turn is influenced by the mutual coupling in transmitting and receiving array antennas. A water-filling-based procedure is proposed to optimize the training signal transmission to minimize the MIMO channel estimation errors.