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Chip level LMMSE Equalization for Downlink MIMO CDMA in fast fading environments

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Title: Chip level LMMSE Equalization for Downlink MIMO CDMA in fast fading environments
Author: de Baynast, Alexandre; Radosavljevic, Predrag; Cavallaro, Joseph R.
Type: Conference paper
Keywords: Signal Processing in Communications; Channel Estimation; CDMA; Equalization; MIMO Systems.
Citation: A. de Baynast, P. Radosavljevic and J. R. Cavallaro, "Chip level LMMSE Equalization for Downlink MIMO CDMA in fast fading environments," vol. 4, pp. 2552 - 2556, 2004.
Abstract: 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.
Date Published: 2004-11-01

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  • ECE Publications [1048 items]
    Publications by Rice University Electrical and Computer Engineering faculty and graduate students