Research Article
2D Active Antenna Array Design for FD-MIMO System and Antenna Virtualization Techniques
Figure 2
Comparison of four FD-MIMO antenna array architectures: two different antenna array configurations ( and antenna element spacing in elevation) and two different antenna array polarization arrangements (a colocated cross-polarized array is referred to as X-pol, and an alternating-polarized array is referred to as Alt.-pol). Baseline configuration is shown on the top right of (a). Simulations assumptions are also given.
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