Zero-Forcing Precoding in the Measured Massive MIMO Downlink: How Many Antennas Are Needed?

Table 1

Antenna configuration.

Type		Parameter values
Antenna type		UPA	ODA
Element number		32	56(1♯ ~ 16♯ in use)
Cross polarization		±45°	±45°
Center frequency		3.5 GHz/6 GHz	3.5 GHz/6 GHz
Bandwidth		200 MHz	200 MHz
Distribution of antennas		planar	cylinder
Element spacing		0.5 wavelength	0.5 wavelength
Angle range	Azimuth	−70° ~ 70°	−180° ~ 180°
	Elevation	−70° ~ 70°	−55° ~ 90°