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• W2024666521 abstract "We present a blind recursive algorithm for tracking rapidly time-varying wireless channels in precoded multiple-input-multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems. Subspace-based tracking is normally considered for slowly time-varying channels only. Due to the frequency correlation of the wireless channels, the proposed scheme can collect data not only from the time but from the frequency domain as well to speed up the update of the required second-order statistics. After each such update, the subspace information is recomputed using the orthogonal iteration, and then, a new channel estimate is obtained. We also investigate choices of precoder in terms of the tradeoff between the symbol recovery capability and the channel estimation performance and demonstrate the convergence properties of our approach. The proposed algorithm is evaluated in a Third-Generation Partnership Project (3GPP) Spatial Channel Model suburban macro scenario, in which a mobile station is allowed to move in any direction with a speed up to 100 km/h, corresponding to a maximum Doppler shift of about 230 Hz in this case. Numerical experiments show that the normalized mean square error of the channel estimates converges to a level of -30 dB within less than five OFDM symbols when the signal-to-noise ratio (SNR) (per symbol) is ≥ 20 dB." @default.
• W2024666521 created "2016-06-24" @default.
• W2024666521 creator A5011364905 @default.
• W2024666521 creator A5072000575 @default.
• W2024666521 date "2012-02-01" @default.
• W2024666521 modified "2023-09-28" @default.
• W2024666521 title "Blind Recursive Subspace-Based Identification of Time-Varying Wideband MIMO Channels" @default.
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• W2024666521 doi "https://doi.org/10.1109/tvt.2011.2181436" @default.
• W2024666521 hasPublicationYear "2012" @default.
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