A low-complexity enhancement to suboptimal CDMA receivers

Conventional matched-filter detectors for code-division multiple-access (CDMA) systems suffer from multiple-access interference (MAI) caused by nonzero correlation between spreading codes at the receiver. A host of advanced detector structures have been proposed to reduce the effect of MAI and, henc...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2004-11, Vol.3 (6), p.1924-1927
Main Authors: Lau, A.P.T., Teng Joon Lim
Format: Article
Language:English
Subjects:
Applied sciences
Bit error rate
Code division multiple access
Code division multiple-access (CDMA)
Covariance matrix
Detection, estimation, filtering, equalization, prediction
Detectors
Error correction
Error correction codes
Error detection
Exact sciences and technology
Information, signal and communications theory
likelihood ratio test
Matched filters
Multiaccess communication
Multiple access interference
Multiuser detection
Performance enhancement
Radiocommunications
Receivers
Signal and communications theory
Signal, noise
Spreading
Telecommunications
Telecommunications and information theory
Testing
Transmitters. Receivers
Wireless communication
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Summary:Conventional matched-filter detectors for code-division multiple-access (CDMA) systems suffer from multiple-access interference (MAI) caused by nonzero correlation between spreading codes at the receiver. A host of advanced detector structures have been proposed to reduce the effect of MAI and, hence, improve performance. However, most multiuser detectors suffer from their relatively complex implementations. A simple method is proposed to improve the performance of the conventional detector by detecting and correcting decision errors at its output without the use of forward error correcting (FEC) codes. The proposed post-detection error control method is shown to substantially improve the performance of the conventional detector, but has a much lower complexity than most other multiuser detectors.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2004.837630