Table of Contents
ISRN Communications and Networking
Volume 2011, Article ID 147292, 7 pages
Research Article

A Blind Two-Stage Receiver for MIMO-CDMA Systems

1Department of Optoelectronics and Communication Engineering, National Kaohsiung Normal University, 62 Shenjhong Road, Yanchao Township, Kaohsiung County 824, Taiwan
2Department of Electronic Engineering, National United University, 1 Lien-Da, Kung-Ching Li, Miaoli 360, Taiwan

Received 23 February 2011; Accepted 24 March 2011

Academic Editors: H. Ikeda, A. Maaref, and H.-L. Wei

Copyright © 2011 Fuh-Hsin Hwang and Tsui-Tsai Lin. 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.


A blind two-stage multiple-input multiple-output (MIMO) receiver is proposed for code-division multiple access (CDMA) systems utilizing space-time block coding (STBC) over a multipath fading channel. Specifically, in the first stage, a signal-blocked (SB) interference-blocked (IB) detector is first constructed for collection of the desired signals and suppression of multiple access interference (MAI). In the second-stage, a decision-directed scheme is developed to alleviate desired signal cancellation. Computer simulations demonstrate that the proposed blind receiver can achieve a reliable output signal-to-interference-plus-noise ratio (SINR) performance approximating that of the optimal minimum mean squared error (MMSE) receiver and can exhibit the robustness against the finite data sample effect.