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Decision-feedback detection for MIMO-ISI channels: design using fixed and adaptive constraints

journal contribution
posted on 2007-11-01, 00:00 authored by X H Nguyen, Jinho ChoiJinho Choi
In this correspondence, we investigate the decision-feedback detection for multiple-input multiple-output intersymbol-interference (MIMO-ISI) channels. First, a novel constrained symbol-by-symbol decision-feedback detector (DFD) is proposed, in which a constraint on the feedback filter provides robustness against error propagation and outperforms the conventional DFD. However, we find that an error floor is observed at high signal-to-noise ratios (SNRs) if a fixed constraint is used. To resolve this problem, we then propose an iterative symbol-by-symbol DFD in which an adaptive constraint is implicitly used to update the DFD's coefficients. Simulation results show that the error-floor problem is overcome and that the performance becomes satisfactory at high SNRs through iterations.

History

Journal

IEEE transactions on vehicular technology

Volume

56

Issue

6

Pagination

3931 - 3937

Publisher

Institute of Electrical and Electronics Engineers

Location

Piscataway, N.J.

ISSN

0018-9545

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2007, IEEE