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An Adaptive Multiuser Detection Algorithm for CDMA Systems Using Antenna Diversity

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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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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Concordia University, Montreal, H3G 1M8, Canada

    K.-L. Du & M. N. S. Swamy

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  1. K.-L. Du
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  2. M. N. S. Swamy
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Correspondence to K.-L. Du.

Additional information

This work was supported by NSERC of Canada.

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Du, KL., Swamy, M.N.S. An Adaptive Multiuser Detection Algorithm for CDMA Systems Using Antenna Diversity. Circuits Syst Signal Process 29, 1207–1222 (2010). https://doi.org/10.1007/s00034-010-9201-9

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  • DOI: https://doi.org/10.1007/s00034-010-9201-9

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