Realizable MIMO Decision Feedback Equalizers
IEEE International Conference on Acoustics,
Speech and Signal Processing,
Phoenix, AR, March 15-19, 1999, pp 2591-2594.
© 1999 IEEE
- A general MMSE decision feedback equalizer (DFE) for
multiple input-multiple output channels is presented.
It is derived under the
constraint of realizability, requiring finite smoothing lag and causal
filters both in the forward and feedback link. The proposed DFE,
which provides an optimal structure as well as optimal filter
degrees, is obtained as an explicit solution in terms of the channel and
A generalization of the scalar zero-forcing DFE is also
presented. Conditions for the existence of such an equalizer are
discussed. We argue that when no zero-forcing equalizer exists,
poor near-far resistance of the corresponding optimal
minimum mean square error DFE can be expected.
A numerical example indicates the
potential advantages of using a decision feedback equalizer with
appropriate structure. The main improvements are obtained at moderate
to high signal-to-noise ratios.
PhD Thesis by Claes Tidestav.
Complete report version.
VTC'99 paper on Reuse Within
Cells with FIR-DFE's, with measured data.
Postscript (compressed, gz),
Personal use of this material is permitted.
However, permission to reprint/republish this material for
advertising or promotional purposes or for creating new
collective works for resale or redistribution to servers or lists,
or to reuse any copyrighted component of this work in other works
must be obtained from the IEEE.