An Adaptive Decision Feedback Equalizer for Time-Varying Frequency Selective MIMO Channels

A new adaptive equalizer for wireless systems operating over time-varying and frequency selective multiple-input multiple-output (MIMO) channels is proposed. The equalizer consists of a number of decision feedback equalizer (DFE) stages, each one detecting a single stream. The equalizer filters, as...

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Bibliographic Details
Main Authors: Rontogiannis, A.A., Kekatos, V., Berberidis, K.
Format: Conference Proceeding
Language:English
Subjects:
Adaptive equalizers
Autocorrelation
Cost function
Data mining
Decision feedback equalizers
Filters
Frequency
MIMO
Robustness
Time varying systems
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Summary:A new adaptive equalizer for wireless systems operating over time-varying and frequency selective multiple-input multiple-output (MIMO) channels is proposed. The equalizer consists of a number of decision feedback equalizer (DFE) stages, each one detecting a single stream. The equalizer filters, as well as the ordering by which the streams are extracted, are updated according to a LS cost function in a VBLAST-like fashion. By taking advantage of the underlying order recursive problem structure, a computationally efficient and numerically robust algorithm is developed based on the Cholesky factorization of the input data autocorrelation matrix. The convergence and tracking capabilities of the equalizer are studied through extensive computer simulations, and its BER performance is evaluated for hostile, time and frequency selective channels
ISSN:1948-3244
1948-3252
DOI:10.1109/SPAWC.2006.346400