Iterative Multiuser Detection/Decoding for Coded CDMA Systems in Non-Gaussian Noise


KU, I. and LEE, S. W. and CHUAH, T. C. (2007) Iterative Multiuser Detection/Decoding for Coded CDMA Systems in Non-Gaussian Noise. IEICE Transactions on Communications, E90-B (7). p. 1584. ISSN 0916-8516

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We propose a robust iterative multiuser receiver for decoding convolutional coded code-division multiple access (CDMA) signals in both Gaussian and non-Gaussian channel noise. The receiver is derived from a modified maximum a-posteriori (MAP) algorithm called the maxlog-MAP algorithm for robustness against erroneous channel variance estimation. Furthermore, the effect of destructive outliers arising from impulsive noise is mitigated in the proposed receiver by incorporating the robust Huber penalty function into the multiuser detector. The proposed receiver is shown to perform satisfactorily over Gaussian and non-Gaussian impulsive channels. In every iteration, cumulative improvement in the quality of the a-posteriori probabilities is also demonstrated.

Item Type: Article
Subjects: T Technology > T Technology (General)
Q Science > QA Mathematics > QA71-90 Instruments and machines > QA75.5-76.95 Electronic computers. Computer science
Divisions: Faculty of Engineering and Technology (FET)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 29 Sep 2011 05:54
Last Modified: 29 Sep 2011 05:54


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