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Adaptive MIMO decision feedback reduced-rank equalization based on joint iterative optimization of adaptive RLS estimation algorithms

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Publication details

DatePublished - 2008
Number of pages6
Pages (from-to)413-418
Original languageEnglish


This paper presents a novel adaptive reduced-rank multi-input-multi-output (MIMO) decision feedback equalization structure based on joint iterative optimization of adaptive estimators. The novel reduced-rank equalization structure consists of a joint iterative optimization of two equalization stages, namely, a projection matrix that performs dimensionality reduction and a reduced-rank estimator that retrieves the desired transmitted symbol. The proposed reduced-rank structure is followed by a decision feedback scheme that is responsible for cancelling the inter-antenna interference caused by the associated data streams. We describe least squares (LS) expressions for the design of the projection matrix and the reduced-rank estimator along with computationally efficient recursive least squares (RLS) adaptive estimation algorithms. Simulations for a MIMO equalization application show that the proposed scheme outperforms the state-of-the-art reduced-rank and the conventional estimation algorithms at about the same complexity.

    Research areas

  • MIMO systems, equalization, parameter estimation, reduced-rank schemes, CHANNELS, SIGNALS

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