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Decision-Feedback Detection for MIMO-ISI Channels: Design Using Fixed and Adaptive Constraints

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2 Author(s)
Xuan Huan Nguyen ; Univ. of Wales Swanse, Swansea ; Jinho 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.

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Vehicular Technology, IEEE Transactions on  (Volume:56 ,  Issue: 6 )