D.3.5 FR2 Cross-polarization

38.1513GPPNRRelease 17TSUser Equipment (UE) Multiple Input Multiple Output (MIMO) Over-the-Air (OTA) performance requirements

This measurement checks how well the measured vertically or horizontally polarized power levels follow expected values. The test setup for cross-polarization is the same as PDP validation in Figure D.3.2-1.

Method of measurement: Step the emulation and store traces from VNA.

VNA settings:

Table D.3.5-1: VNA settings for FR2 cross-polarization

Item	Unit	Value
Centre frequency	MHz	Downlink Centre Frequency in Table D.3.1-1
Span	MHz	40
Number of traces		1000
Number of points		802
Averaging		1

Channel model specification:

Table D.3.5-2: Channel model specification for FR2 cross-polarization.

Item	Unit	Value
Centre frequency	MHz	Downlink centre frequency in Table D.3.1-1
Distance between traces in channel model	wavelength (Note)	> 2
Channel model		As specified in Annex D.1
Mobile speed	km/h	30
NOTE: Time [s] = distance [λ] / MS speed [λ/s] MS speed [λ/s] = MS speed [m /s] / Speed of light [m/s] * Centre frequency [Hz]

Measurement Procedure:

1. Play or step through the channel model listed in Annex D.1.

2. Measure the absolute power received at the centre of the test zone, averaged over a statistically significant number of fades.

a. Use a horn antenna with H polarization terminated to measure the V component.

b. Use a horn antenna with V polarization terminated for the horizontal polarization, in four orthogonal horizontal positions and summed to measure the H component.

3. Calculate the V/H ratio.

4. Compare it with the theory value.

Reference target for FR2 CDL-C UMi:

– V/H FR2 CDL-C-UMi, X2+, fc=28 GHz

– Beam 1, Input 1:  V/H = -0.45 dB

– Beam 1, Input 2:  V/H = 0.49 dB

– Beam 1, Input 1+2:  V/H = 0 dB