An Adaptive Multiuser Detection Algorithm for CDMA Systems Using Antenna Diversity |
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Authors: | K-L Du M N S Swamy |
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Affiliation: | (1) Department of Electrical & Computer Engineering, University of Missouri, Columbia, MO 65211, USA;(2) Department of Electrical & Computer Engineering, University of Missouri, Rolla, MO 65409, USA; |
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Abstract: | Based on the minimum mean squared error (MMSE) between the data stream and the linear combiner output, a new multiuser detection
(MUD) algorithm that combines space–time (ST) processing and antenna array on direct-sequence CDMA signals is proposed. The
proposed ST-MUD algorithm is proved to be equivalent to two existing MMSE-based ST-MUD algorithms, and the theoretical BER
performances for all the three algorithms are the same. The most attractive feature of the new ST-MUD algorithm is based on
the fact that the new method does not require explicit estimation of channel and signaling information. This avoids any channel
estimation error, and the method is thus more robust and more accurate than the other two ST-MUD algorithms in practical implementation.
Adaptation of the proposed ST-MUD algorithm is implemented by using training sequences. Performance of this new multiuser
detector is compared with that of two existing MMSE multiuser detectors and the conventional single-user space–time rake receiver
through simulations. The proposed ST-MUD algorithm provides a performance better than existing algorithms and is especially
suitable for practical CDMA systems. |
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Keywords: | |
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