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A user equipment (UE) beamforming method is proposed in this letter for massive MIMO systems with multi-antenna UEs. The method requires no additional channel information exchange among UEs and has a low computational cost. The beamforming vector is obtained by the semi-definite relaxation based method. Simulations under various environmental configurations demonstrate the performance improvement...
This paper proposes a three-dimensional (3-D) multiuser channel model for stratospheric multipath-fading channel. The birth-death process is used to model the non-stationary properties that scatterers “appear” and “disappear” on the array axes. The spatial correlation of multiuser High Altitude Platform (HAP) multiple-input multiple-output (MIMO) channel is investigated in this paper. This model can...
In massive multiple-input multiple-output (MIMO) systems, the effect of small-scale fading and noise disappear when the number of base station antennas goes to infinity. The only remaining impairment is pilot contamination. In this paper, interference mitigation method is proposed by leveraging the dual antenna user equipments. Given the antenna correlation matrix at the user side, the optimal beamforming...
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