Robust Decision Feedback Equalizers
NUTEK Workshop on Digital Communications,
Uppsala, Sweden, May 25-26, 1992.
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When digital data are transmitted over dispersive radio channels,
a Decision Feedback Equalizer (DFE) can be utilized to
estimate transmitted symbols.
The paper presents a model-bases methodology for
robust design, aimed at reducing the effect of model uncertainties
and of decision errors in the feedback loop.
Design equations are presented for robust and realizable
decision feedback equalizers,
for IIR channels with coloured noise. Given a probabilistic measure
of model uncertainty, the mean MSE, averaged over the whole
class of possible models, is minimized. A robustification
parameter, which trades off error propagation against theoretical
is also introduced. The resulting design equations define a large
class of equalizers, with DFE's and linear equalizers
based on nominal models being special cases.
- Related publications:
in IEEE ICASSP'93 on the above theme.
by Erik Lindskog, May 1995, which includes ICASSP paper.
Robustification against time-variations
within a GSM TDMA frame.
Robust filter design
and uncertainty modelling, as described in Automatica 1993.
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