A family of multiuser decision-feedback detectors for asynchronous code-division multiple-access channels

It is important to identify simple and reliable interference rejection methods for code-division multiple-access (CDMA) channels, since the conventional matched filter receiver has high error rates, and the optimal detector is too complex. We introduce decision-feedback and partial feedback detector...

Full description

Saved in:

Bibliographic Details
Published in:	IEEE transactions on communications Vol. 43; no. 2/3/4; pp. 421 - 434
Main Author:	Duel-Hallen, A.
Format:	Journal Article
Language:	English
Published:	New York, NY IEEE 01-02-1995 Institute of Electrical and Electronics Engineers
Subjects:	Applied sciences Bandwidth Decorrelation Detectors Error analysis Exact sciences and technology Feedback Matched filters Maximum likelihood detection Multiaccess communication Multiple access interference Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) Maximum likelihood receiver Code division multiple access White noise Transmission channel Algorithm Modeling Signal detection Asynchronous transmission
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	It is important to identify simple and reliable interference rejection methods for code-division multiple-access (CDMA) channels, since the conventional matched filter receiver has high error rates, and the optimal detector is too complex. We introduce decision-feedback and partial feedback detectors for asynchronous CDMA channels. Two-stage detectors with decision-feedback in the second stage are also studied. The derivation of the decision-feedback detector is based on spectral factorization which leads to a white-noise channel model. We also describe two implementations of the maximum-likelihood detector for this model. Comparisons among the proposed detectors, the conventional detector, and the linear decorrelating detector are undertaken for several asynchronous CDMA channels. In these examples, high bandwidth efficiency systems are explored, and user energies are varied form being similar to being very different. We find that decision-feedback detectors compare favorably with more complex two-stage methods and maintain good performance under diverse channel conditions.< >
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0090-6778 1558-0857
DOI:	10.1109/26.380060