A low-complexity enhancement to suboptimal CDMA receivers

• Published in: IEEE transactions on wireless communications Vol. 3; no. 6; pp. 1924 - 1927
• Main Authors: Lau, A.P.T., Teng Joon Lim
• Format: Journal Article
• Language: English
• Published: Piscataway, NJ IEEE 01.11.2004; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• 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; Multiuser detection; Matched filter; Bit error rate; Likelihood ratio test; Wireless telecommunication; Code division multiple access; Error detection; Receiver; Performance analysis; Error correction
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2004.837630

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.