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Parallel Interference Cancellation in Multiuser CDMA Channel Estimation

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Abstract

Parallel interference cancellation (PIC) based channel parameter estimators for frequency selective fading channels are proposed for the uplink in code-division multiple-access (CDMA) mobile communication systems. The performance of PIC based algorithms depends heavily on the quality of the multiple-access interference estimates, which can be improved by using adaptive channel estimation filters. The performance of two adaptive complex channel coefficient estimation filters has been verified in a fading channel by computer simulations. According to the results, the PIC based adaptive channel estimators outperform clearly conventional, successive interference cancellation, and decorrelation based adaptive channel estimators. The PIC method is also used in delay tracking. By using the principles of sample-correlate-choose-largest (SCCL) delay trackers, a robust algorithm for multiuser delay tracking in fading channels is obtained.

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Authors and Affiliations

  1. Centre for Wireless Communications (CWC), University of Oulu, P.O. Box 444, FIN-90571, Oulu, Finland

    Matti Latva-aho

  2. Nokia Mobile Phones, P.O. Box 50, FIN-90571 Oulu, Finland

    Jorma Lilleberg

Authors
  1. Matti Latva-aho
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  2. Jorma Lilleberg
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Latva-aho, M., Lilleberg, J. Parallel Interference Cancellation in Multiuser CDMA Channel Estimation. Wireless Personal Communications 7, 171–195 (1998). https://doi.org/10.1023/A:1008804628363

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