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We propose a hybrid precoding scheme for downlink multi-user multiple-input multiple-output (MU-MIMO) millimeter-wave (mmWave) systems. Firstly, the proposed precoder is designed by the beam steering condition and the zero-interference condition, which can be obtained with the information of angles of departure (AoDs) in frequency division duplex (FDD) systems. Then, the proposed precoder is decomposed...
A concept of full-dimension MIMO (FD-MIMO) adopting 2-dimensional (2D) antenna array has been proposed with intent to cope with practical challenges of massive MIMO systems. In this paper, we investigate an FD-MIMO operation that can be transparently applied with current 3GPP LTE specifications, and propose a novel method that facilitates an accurate estimation of channel quality indicator (CQI) at...
Single-array and multiple-array structures were applied to a large-scale planar array for use in uplink space-division multiple access, and their simulated data throughputs were compared. In both structures, a subarray-processing iterative soft-input-soft-output multi-user detector efficiently recovers multi-user signals from multiple RF chains. The phased-array directivity is controlled on the basis...
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