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As the increasing requirement of channel capacity for next-generation mobile broadband communication systems, three-dimensional multiple-input multiple-output (3D MIMO) systems have been attracting much attentions in recent years. Accurate channel estimation is inevitably one of the most essential tasks for designing the 3D MIMO systems. This paper first studies the sparsity of 3D MIMO channel and...
Considering the three dimensional (3D) channel with elevation effect, a two dimensional (2D) antenna array was employed in a generic ray-based 3D multi-input multi-output (MIMO) system. Through utilizing the channel spatial correlation between antennas at the transmitter side, we propose a cascaded MMSE channel estimation with low computational complexity. Numerical results show that the proposed...
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