NDLI: Multiuser channel estimation for long code CDMA systems

Content Provider	IEEE Xplore Digital Library
Author	Bhashyam, S. Aazhang, B.
Copyright Year	2000
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Rice Univ., Houston, TX, USA (Bhashyam, S.)
Abstract	Channel estimation techniques for code-division multiple access (CDMA) systems need to combat multiple access interference (MAI) effectively. Most existing estimation techniques are designed for CDMA systems with short repetitive spreading codes. However, current and next generation wireless systems use long spreading codes whose period is much larger than the symbol duration. In this paper, we derive the maximum likelihood channel estimate for long code CDMA systems over multipath channels using training sequences and approximate it using an iterative algorithm to reduce the computational complexity in each processing window. The asymptotic convergence of the mean of the iterative estimate to the actual channel is also shown. The effectiveness of the iterative channel estimator is demonstrated in terms of squared error in estimation as well as the bit error rate performance of a multistage detector based on the channel estimates. Finally, the proposed iterative channel estimation technique is extended to track slowly varying multipath fading channels using decision feedback. Thus, an MAI resistant multiuser channel estimate with reasonable computational complexity is derived for long code CDMA systems over multipath fading channels.
Starting Page	664
Ending Page	669
File Size	469014
Page Count	6
File Format	PDF
ISBN	0780365968
ISSN	15253511
DOI	10.1109/WCNC.2000.903933
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-09-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiuser channels Multiaccess communication Multiple access interference Channel estimation Computational complexity Fading Maximum likelihood detection Maximum likelihood estimation Multipath channels Iterative algorithms
Content Type	Text
Resource Type	Article

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