1. Introduction  
2. Hybrid Beamforming Channel  
3. Millimeter-Wave Propagation  
4. Low-Cost Hybrid Digital-Analog Beamforming for Multiuser Massive MIMO  
5. Transmission Power and Power Consumption for Millimeter Wave Massive MIMO  
6. Small Cells and Beamforming  
7. Numerical Results  
8. Conclusion