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Enhanced turbo MMSE equalization for MIMO-OFDM over rapidly time-varying frequency-selective channels

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4 Author(s)
Rugini, L. ; DIEI, Univ. of Perugia, Perugia, Italy ; Banelli, P. ; Kun Fang ; Leus, G.

We present iterative turbo-like equalizers for multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems subject to frequency-selective channels with rapid time variation. The proposed equalizers are obtained from a Bayesian approach based on the unbiased minimum mean-squared error (MMSE) criterion, but also admit a probabilistic data association (PDA) interpretation. Two equalizers are discussed: a basic version that makes use of symbol-level variance estimation, and an enhanced version that takes advantage of bit-level variance estimation. Simulation results show that both the presented equalizers outperform a previously proposed MMSE decision-feedback equalizer (DFE) of comparable complexity.

Published in:

Signal Processing Advances in Wireless Communications, 2009. SPAWC '09. IEEE 10th Workshop on

Date of Conference:

21-24 June 2009

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