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A unified approach to multiuser detectors for CDMA and their geometrical interpretations

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2 Author(s)
Jung, P. ; Dept. of Electr. Eng., Kaiserslautern Univ., Germany ; Alexander, P.D.

In this paper, we align a class of known multiuser detectors for code-division multiple-access (CDMA) along with some new multiuser detectors in a unified group. The new multiuser detectors are devised by completing the structure of the group. The unified group structure is a binary tree obtained by splitting sequence and single symbol detection, maximum aposteriori (MAP) and maximum likelihood (ML) detection, and unconstrained as well as constrained detection. The link between sequence and single symbol estimators is explained revealing the increased complexity of single symbol estimators as compared to sequence estimators. Finally, the aforementioned group structure is supported by a geometrical technique depicting the detection process performed by the multiuser detectors

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Selected Areas in Communications, IEEE Journal on  (Volume:14 ,  Issue: 8 )