Outage-Constrained Beamforming for Two-Tier Massive MIMO Downlink with Pilot Reuse

<div>A kind of TDD-based frame structure. The pilot reuse scheme for the two-tier HetNet is presented in (a). The pilot scheme for achieving global perfect CSI is presented in (b).</div>

International Journal of Antennas and Propagation

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Figure 2

Figure 2: Outage-Constrained Beamforming for Two-Tier Massive MIMO Downlink with Pilot Reuse 