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Research Letters in Communications
Volume 2007 (2007), Article ID 83283, 3 pages
http://dx.doi.org/10.1155/2007/83283
Research Letter

On the MMSE Criterion for Space-Time Coded Signaling in the Presence of Unknown Interference

1Japan Advanced Institute of Science and Technology (JAIST), Ishikawa 923-1292, Japan
2Center for Wireless Communication (CWC), University of Oulu, Oulu 90014, Finland
3Institute for Information Technology, Ilmenau University of Technology, Ilmenau 98693, Germany

Received 11 September 2007; Accepted 5 October 2007

Academic Editor: Luca De Nardis

Copyright © 2007 Tad Matsumoto and Aihua Hong. 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

The primary goal of this letter is to provide comparative assessments to the two cases where different criteria are used in joint over antenna minimum mean squared error (JA-MMSE) spatial filtering for space-time coded systems in the presence of unknown interference. It is shown that additional constraints to preserve the space-time coded signal structure in JA-MMSE spatial filtering place floor in bit error rate (BER) performance, while imposing no additional constraint places no error floor.