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Soft decision approaches for blind adaptive decision feedback equalizers

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4 Author(s)
Wonzoo Chung ; Dotcast, Inc., Kent, WA, USA ; Endres, T.J. ; Long, C. ; Johnson, C.R.

We consider joint blind optimization schemes for decision feedback equalizer (DFE) coefficients and decision device, and propose adaptive solutions based on a soft decision device which combines a blind infinite impulse response (IIR) filtering adaptation and the conventional decision directed (DD) DFE adaptation. The benefits of our approach are mainly three-fold: (1) the initialization of DFE taps does not rely on a training sequence; (2) the transition between the (re)initialization period and the tracking period is continuous and consequently the equalizer exhibits robust performance under sudden time variation in the multipath channel; (3) the optimized soft decision device mitigates error propagation of the DFE and further reduces the mean square error (MSE) of the DFE.

Published in:

Signal Processing Advances in Wireless Communications, 2003. SPAWC 2003. 4th IEEE Workshop on

Date of Conference:

15-18 June 2003