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Title:
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Chip level LMMSE Equalization for Downlink MIMO CDMA in fast fading environments |
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Author:
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de Baynast, Alexandre; Radosavljevic, Predrag; Cavallaro, Joseph R.
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Type:
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Conference Paper |
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Keywords:
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Signal Processing in Communications; Channel Estimation; CDMA; Equalization; MIMO Systems. |
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Citation:
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A. de Baynast, P. Radosavljevic and J. R. Cavallaro,"Chip level LMMSE Equalization for Downlink MIMO CDMA in fast fading environments," in Globecom,, pp. 2552 - 2556. |
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Abstract:
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In this paper, we consider linear MMSE equalization for wireless downlink transmission with multiple transmit and receive antennas in fast fading environment. We propose a new algorithm based on conjugate-gradient algorithm with enhanced channel estimation. In order to be robust to the channel variations, the channel coefficients are estimated by using a weighted sliding window. Two methods to determine optimal weights with respect to the Doppler frequency are proposed. The algorithm has been tested in fast fading environment (Vehicular A for a velocity for the mobile station of 120 km/h). We show by simulations that good performance are obtained in correlated fast fading environment with reasonable complexity. Moreover, this method outperforms approaches based on forgetting factor, basic sliding window and LMS. |
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Date Published:
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2004-11-01 |
