C.3.5 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 C.3.2-1.

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

VNA settings:

Table C.3.5-1: VNA settings for cross-polarization

Item

Unit

Value

Centre frequency

MHz

Downlink Centre Frequency

in Table C.3.1-1

Span

MHz

40

Number of traces

1000

Number of points

802

Averaging

1

Channel model specification:

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

Item

Unit

Value

Centre frequency

MHz

Downlink centre frequency

in Table C.3.1-1

Distance between traces in channel model

wavelength (Note)

> 2

Channel model

As specified in Annex C.1

Mobile speed

km/h

30

NOTE: Time [s] = distance [] / MS speed [/s]

MS speed [/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 C.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 vertically polarized sleeve dipole to measure the V component.

b. Use a horizontally polarized (vertically oriented) magnetic loop dipole, or a horizontally polarized sleeve dipole measured 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.