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• W2783755075 abstract "In cellular systems, deploying a large number of antennas at the base station (BS), also called massive multiple-input multiple-output (MIMO), can offer a huge improvement in system throughput. This performance gain achieved through coherent beamforming highly depends on having accurate channel state information (CSI) at the BS. Initially, massive MIMO was considered promising only for time division duplexing (TDD) systems because the downlink training overhead in frequency division duplexing (FDD) systems could be large. To reduce the overhead in FDD systems, we propose efficient eigenspace training and precoding. In the downlink training, the prebeamforming matrix is designed based on the spatial fading correlation to probe the channel and minimize the mean squared error (MSE) in channel estimation. In data transmission, the precoding matrix is designed based on instantaneous CSI to manage the inter-user interference. Our algorithms achieve significant savings in the downlink training because the overhead is associated with the dimension of prebeamforming matrix and no longer limited by the number of BS antennas. Compared with joint spatial division and multiplexing, our algorithms offer much lower MSE and, under some conditions, higher sum rates." @default.
• W2783755075 created "2018-01-26" @default.
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• W2783755075 date "2017-12-01" @default.
• W2783755075 modified "2023-09-24" @default.
• W2783755075 title "Efficient Eigenspace Training and Precoding for FDD Massive MIMO Systems" @default.
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• W2783755075 doi "https://doi.org/10.1109/glocom.2017.8254883" @default.
• W2783755075 hasPublicationYear "2017" @default.
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